376 DR. G. H. FOWLER ON SEA-PENS [Apr. 1?> 



Reference Letters. 



(a) Hand : — R, radius. U, ulna, .?, scaphoid, si, seapho-luuatum. tm, 

 trapezium, td, trapezoid, m, magnum, cc, central. Pp, pra>pollex. 

 I-V, metacarpal bones, first to fifth. 

 (/>)Foot: — T, tibia, is fibula, a, astragalus, ca, calcaneum. n, naviculare. 

 nt, tibial, nf, fibLdar naviculare. el, c'2, c3, internal, middle, external 

 cuneiform. c\d, dorsal, clp, plantar part of the internal cuneiform. 

 cb, cuboid. Ph, pra-hallux. 



I-V, metatarsal bones, first to fifth. 



Plate XXI. 



Muscles of Mammalian Hands and Feet. 



Fig. 1. Left foot of Didclphi/s marsupialis, 2/1 enlarged (p. 359). 



2. Second toe of Didelphys marsupialis, 4/1 enlarged. 



3. Forearm of Trichosurus vulpeeula (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 prse- 



hallucis (p. 373). 



Reference Letters. 



(a) Fore 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). 



(h) Hind lijib : — 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 Veretillidce from the 

 Madras Museum. By G. Hebbert Fowler, B.A., 

 Ph.D., Assistant Professor of Zoology in University 

 College, London. 



[Keceived 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. 



Cayerntjlaria malabarica, sp. n. 



This beautiful species (Plate XXII. fig. 1) differs from all other 

 Veretillidse with which I am acquainted in the great breadth of 

 the rbachis, 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 Cavernidaria 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 : — 



