OCR Text |
Show 412 POLPYI· DrsTIOOPHORA, Lam. k d ores are arranged on two Where the more strongly mar e. p hich the pores are equally sides of the branches( 1 ). Of those m w distributed, we distinguish MrLLEPORA, Lam • . er wh.1 c h are sol 'ld , and variously ramous(2). Or Mllleporre prop ' t as is sometimes the case, they When their pores are not apparen ~ are called NuLLIPORA(3). Then we have the EsoHARA, Lam. Which are f urm. s h e d w'lth flattened, foliaceous expansions( 4). RETEPORA, Lam. Which are Escharre, pierced with meshes( 5). ADEONA, Lamour. . 1 t d stem. some are entire, and others Escharre borne on an artlCU a e ' pierced with meshes(6). d Ell. 1., XXVI, f, 3, 4, copied Encyc. (1) Millepora violacea, Pall., Sol. an 'p Method., Vera, pl. 481, f. 1. I v 7 and Supp. I, xxvii-Mill. cupera, (2) Mille'~'~ora alcicornis, Pall., Esper, , s' 1 dEll. X.Xlll, f. 1-8. :r .. • M truncata, o · an ' d Ell Lam., Esper, Supp., I, ~vm.;- . all XXVll, f. c;-M. calcarea, Sol. an ., (3) Millepora informts, Ell., Cor .. , M al a, Id., lb., 10, 11, 12. XXIII f. 13;-.llf. cretacea, Id., lb., 9,- X.X gf ·-Eschara lichenoi'du, Seb., DI, ' z· Ell Corall X , · a, (4) Millepora fo tacea, . ., 1 dEll LXXII f. 9-12. dd to So • an ., ' XXV f d.· c. 10;-Esch. lobata, Lamour., a Manchette de Neptune, Ell., CoraU.,. ' . 1' (5) Millepora cellulosa, vulgo, ·-M. reticulata, Marsili., Hlst. Mar. p. Daubent., Pl. Enl., No. 23, No. XXIll, ' . l' Jd XXIV, f, 165, 166. Sol and Ell., LXX, f, 5;-.B.d. folltco.ma.,ofbut (6) Jldeona grisea, Lamouroux, . t bl' shed on considerations 11 eral others, es a 1 p l ier8 at7tt }'or these genera as we as sev . . u thodique du genres des o yp ' th " E:cpoattwn J.r.Le little importance, see ~ll' , by Lamouroux. Paris, 1821. le~ planchu de Solander et u, CORALLIFERI. 413 In the third tribe, or the NAT ANTES, The axis is stony but not fixed. P.ENNATULA, Lin. A common body, free from all adhesion( 1 ), of a regular and constant form, and susceptible of locomotion by the contractions of its fleshy portion and the combined action of its Polypi. This body is fleshy, and contracts or dilates in its various parts by means of the fibrous layers that enter into its composition; its axis encloses a simple stony stem; the Polypi have generally eight dentated arms. Most of the species diffuse a vivid phosphorescent light. Whatever be the general form of the Pennatulre, one of their ex-. tremities is always destitute of Polypi, and has been compared to the tubular portion of a bird's feathe1·. PENNATULA, Cuv. The Pennatulre, properly so called, have given their name to the whole genus, which name has been derived from their own resemblance to a quill. The portion destitute of Polypi is cylindrical and terminates in an obtuse point. The other part is furnished on each side with wings or laminre, more or less long and broad, supported by spines or rigid setre which arise from their interior and roughen one of their edges, without, however, being articulated with the stony stem of the axis; it is from between their lamince that the Polypi protrude. · P. rubra, P. phosphorea, Gm.(2); Albinus, Annot. Acad., I, vi, 3, 4. Where the stem between the laminre is extremely scabrous posteriorly, with the exception of a longitudinal line. In the Atlantic ocean and Mediterranean. (1) Certain species penetrate into the sand or become entangled in the folds of various marine bodies, but never form any durable adhesion. (2) Both are red. The P. rubra only differs from the other in having a little •pine at the base of each posterior lamina. It is perhaps a mere variety. |