OCR Text |
Show 1891.] THE 'CHALLENGER' EXPEDITION. 441 15. SCALARIA DISTINCTA. (Plate XXXV. fig. 15.) Testa elongata, gracilis, cdba ; anfractus perconvexi, lente accres-centes, costis tenuibus circiter 16 (hie illic una crassiore) obliquis instructi, liris spiralibus tenuioribus circa 5 costas continuis ornati; anfr. idtimus medio carinatus, infra concavus, sublcevis ; apertura subcircularis. Longit. 11 millim., diam. 3|; apertura 2\ longa et lata. The larger costae are about twice as thick as the rest, and one in number on every whorl. 16. ODOSTOMIA (TURBONILLA) FISCHERI. (Plate XXXV. fig. 16.) Testa gracilis, subulata, alba, polita ; anfractus normales 9, convexi, lente crescentes, sutura subprofunda sejuncti, longitudinaliter confertim plicati, plicis in anfr. ultimo infra medium obsoletis apex sinistrorsus, globosus, heliciformis ; apertura parva, longit. totius -| adcequans ; columella suhperpendicularis, vix arcuata, anguste reflexo., hand plicata vel contorta. Longit. 9 millim., lat. 2 | ; apertura 2 longa, lg lata. Of the two specimens under examination, one has the costae rather more decidedly developed than the other. The latter exhibits slight traces of spiral striae below the suture. 17- ODOSTOMIA (TURBONILLA) CONSANGUINEA. (Plate XXXV. fig-17.) Testa 0 fischeri similis, seel gracilior, anfractibus normalibus constructa, costis latioribus 14-15 parum elevatis ornata ; parva, longit. totius ^-\ adcequans. Longit. 10 millim., diam. 2; apertura fere 1| longa, 1 lata. The ribs or plicae in O. fischeri are about seventeen or eighteen in number and considerably finer than in the present species. Besides this distinction, the proportions with regard to length are so different that there is little doubt that they constitute separate species. 18. ODOSTOMTA (TURBONILLA) CONSTRICTA. (Plate XXXV. fig. 18.) Testa elongata, parum pyramidalis, alba, nitida ; anfractus normales octo, subplani, sed in medio leviter constricti, sutura lineari, distincta sejuncti, costis rectis 16-17 interstitia subcequantibus, instructi, anfr. ultimus inferne Icevis, ad peripheriam rotunda-tus; apex globosus, sinistrorsus, Icevis; apertura plus minus subquadrata, longit. totius \ subecquans ; columella leviter obliqua, hand torta. Longit. 5 | millim., diam. 1|; apertura 1 longa, § lata. The constriction is just a trifle above the middle of the whorls, which have a slightly turreted appearance. 19. SOLARIUM ATKINSONI. (Plate XXXV. figs. 19-19 b.) Testa discoidedis, acute carinata, mediocriter umbilicata, albida, superne depresse conoidalis, lateribus leviter convexis, infra |