30 NATURAL HISTORY BULLETIN. 



distinct species from various regions, with A. squamata of 

 Europe. 



This West Indian form appears to me to be distinct, though 

 very closely allied to A. squamata. I have described, above, 

 a small but characteristic specimen, which agrees very close- 

 ly with Liitken's original figures. 



Amphilimna, gen. nov. Type, A. olivacea. 



Mouth papillae four or five in a series. Tooth papillae two 

 to four. Arm-spines six to ten, of moderate length. Ten- 

 tacle-scales usually two. Disk swollen dorsally, with a notch 

 over the base of each arm, and covered with spinules. Radial 

 shields parallel, largely in contact. This genus includes, be- 

 sides the type, only A caribea Ljung. 



Amphilimna olivacea Ver. 



Ophiocnida olivacea Lyman, Bull. Mus. Comp. Zool., I, 10, p. 340, 

 1869; 111. Cat. Mus. Comp. Zool., VI, pi. I, figs. 7, 8; Bull. Mus. 

 Comp. Zool., V, 9, p. 227; op. cit., X, p. 253. Verrill, Amer. Journ. 

 Sci., Vol. XXIII, p. 219; Ann. Rep. U. S. Fish Com., Vol. X, p. 661; 

 op. cit., Vol. XI, p. 549; Lyman, Report Voy. Challenger, Zool. 

 Ophiuroidea, V, p. 156, 1882. 



Sta. 6i, off Key West, in 75 to 80 fathoms, one example. 



Taken by the U. S. Fish Comm. at numerous stations off 

 the east coast of the United States, from off Martha's Vine- 

 yard to Cape Hatteras, in 63 to 192 fathoms, and by the 

 "Blake" from off Rhode Island to the West Indies, in 40 to 

 126 fathoms. 



It is possible that A. caribcea (Ljung.) from the West 

 Indies, is the young of this species. 



Ophionereis reticulata Liltk. 



Op/rionereis reticulata Lutken, Add. ad Hist. Oph. Pt. II, p. 110, pi. 

 Ill, figs. 6a, 6b, 1859. Lyman, 111. Cat. Mus Comp. Zool., I, p. 141, 

 1865; Bull. Mus. Comp. Zool., V, 9, p, 224; op. cit. X, p. 253. Verrill, 

 Notes on Radiata, Trans. Conn. Acad., I, pp, 342, 366, 1868. Lyman, 

 Report Voy. Challenger, Zool., Ophiuroidea, V, p. 162, pi. XL, figs. 

 13-15, 1882, anatomy. 



