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Show 376 DR. G. H. FOWLER ON SEA-PENS [Apr. 17, Reference Letters. (a) H A N D :-R, radius. U, ulna, s, scaphoid, si, scapho-lunatum. tm, trapezium, td, trapezoid, m, magnum, ce, central. Pp, praepollex. 1-V, metacarpal bones, first to fifth. (ft) F O O T : -T, tibia. F, fibula, a, astragalus, ca, calcaneum. n, naviculare. nt, tibial, nf, fibular naviculare. c\, c2, c.3, internal, middle, external cuneiform, eld, dorsal, clp, plantar part of the internal cuneiform. cb, cuboid. Ph, praehallux. I-Y, metatarsal bones, first to fifth. PLATE XXI. MUSCLES of Mammalian Hands and Feet. Fig. 1. Left foot of Didelphys marsupialis, 2/1 enlarged (p. 359). 2. Second toe of Didelphys marsupialis, 4/1 enlarged. 3. Forearm of Trichosurus vulpecula (p. 361). 4. Hand of Sciurus arizonensis (p. 362). 5. Forearm and hand of Linsang gracilis (p. 364). 6. Wrist of Viverricula malaccensis (p. 356). 7. Praehallux of Euphractus minutus (nat. size) : m., interosseus prae-hallucis (p. 373). Reference Letters. (a) F O R E LIMB :-Pp, praepollex. Pm, postminimus. po, pollex (thumb), pis, pisiform bone, plm, m. palmaris longus. pirn, r, plm. u, m. palmaris 1. radialis, ulnaris. u.i., m. ulnaris internus (flexor c. uln.). r.?., m. radialis internus (fl. c. radialis). (b) H I N D LIMB :-Ph, praehallux. h, hallux (great toe). 2 t, second toe. pla, m. plantaris. tib. p, m. tibialis posticus, w, web. 2. On two Sea-pens of the Family Veretillida? from the Madras Museum. By G. HEBBERT FOWLER, B.A., Ph.D., Assistant Professor of Zoology in University College, London. [Received April, 2, 1894.] (Plate XXII.) For the opportunity of examining these specimens, I am indebted to Prof. F. Jeffrey Bell, who received them from Mr. Thurston of the Madras Museum. CAVERNTJLARIA MALABARICA, sp. n. This beautiful species (Plate XXII. fig. 1) differs from all other Veretilhdae with which I a m acquainted in the great breadth of the rhachis, and in the sharpness of the curvature by which the rhachis is marked off from the stalk ; the result is to give the colony a club-shaped outline described only in Cavernularia glans, of this family. To what extent such a difference of form as this may be produced, or at least accentuated, by different degrees of expansion or contraction of the colony, I am unable to say; and I have therefore sought for other specific marks. The dimensions of the colony in millimetres are as follows:- |