294 BULLETIN : MUSEUM OF COMPAKATIVE ZOOLOGY. 



Each one carries four minute, well-spaced, pointed spines, about one-third as long 

 as plate, nearly equal or uppermost shortest. — Tentacle pores conspicuous, first 

 six or eight with scales on both sides, but further out tentacle-scales are confined 

 to margin of side arm-plates and resemble so closely the arm-spines that it is not 

 easy to distinguish between them; first pore entirely distinct from mouth-slit, with 

 five scales on outer side and five on inner ; second pore has six scales on outer 

 (proximal) side and four on inner ; third has six and four respectively ; fourth, 

 seven and four ; fifth, seven and three ; tenth, sixth and none. — Color in alcohol 

 white. 



4 specimens, Uraga Channel, near Tokyo, Japan. 70 fathoms. Owston 

 collection. 



When Lyman published his key to Ophioglypha (Challenger Report, 1882), 

 he included 58 species as valid. Since then more than 40 additional species have 

 been described, chiefly from the collections of the " Siboga," " Albatross," 

 " Blake," and " Investigator," so that it is with some hesitation that I add an- 

 other to this already unwieldy group. The genus, however, is not so homoge- 

 neous but that it can be separated into subordinate divisions which at some future 

 time it may be desirable to recognize as genera. One of these groups, of which 

 0. variabilis Lyman is a good representative, has the following characters : — 



Disc and arms high, latter rounded, with very short spines ; basal under arm- 

 plates about as broad as long ; side arm-plates not meeting below within disc ; 

 oral shield large and conspicuous, covering a considerable part (sometimes nearly 

 all) of ventral interbrachial space ; adoral plates (usually small) at inner point of 

 oral shield ; first pair of tentacle pores not opening into mouth-slit ; tentacle 

 scales usually numerous. The following species belong in this group : — 



bullata Wyville Thomson. 1873. Nature, 8, p. 400. South Atlantic Ocean, 



1240-2850 fathoms. 

 convexa Lyman, 1878. Bull. Mus. Comp. Zobl., 5, p. 84. North Pacific, 2050- 



2350 fathoms (tropical Atlantic, 114-270 fathoms?), 

 sculptilis Lyman, 1878. Bull. Mus. Comp. Zobl., 5, p. 84. Pacific Ocean, off 



Japan, 1875 fathoms, 

 variabilis Lyman, 1878. Bull. Mus. Comp. Zobl, 5, p. 85. Dutch East Indies, 



1425 fathoms (West Indies, 175-955 fathoms), 

 ornata Lyman, 1878. Bull. Mus. Comp. Zobl., 5, p. 86. Tropical Pacific, north 



of Dutch New Guinea, 2000 fathoms, 

 lacazei Lyman, 1878. Bull. Mus. Comp. Zool., 5, p. 87. South Pacific Ocean, 



south of Australia; coast of Chili, 2160-2600 fathoms, 

 lienosa Lyman, 187S. Bull. Mus. Comp. Zobl, 5, p. 88. Antarctic Ocean, 



southwest of Australia, 1950 fathoms, 

 radiata Lyman, 1878. Bull. Mus. Comp. Zobl., 5, p. 89. Pacific Ocean, off 



west coast of Luzon, Philippine Islands, 1050 fathoms, 

 undata Lyman, 1S78. Bull. Mus. Comp. Zobl., 5, p. 90. Pacific Ocean, west 



of Fiji Islands, 1450 fathoms. 



