OPHIUBANS OF THE PHILIPPINE AND ADJACENT WATERS. 67 

 OPHIOGEMA, new genus. 



Description. This genus is near the genus Ophiacantha. The 

 dorsal surface of the disk is covered with little plates each bearing 

 a rather stout pointed spine; the distal border of the upper arm 

 plates is also armed with spines resembling those of the disk. Fol- 

 lowing the oral plate, between it and the first under arm plate, there 

 is a supplementary plate which lies on half of the outer border of 

 the adoral plate and carries the outer mouth papilla; this is very 

 much smaller than the following. The under-arm plates are re- 

 markably broadened and short at the commencement of the arms. 

 In the last third of the arms the two first ventral spines show a 

 tendency to become curved towards their tips in such a manner as 

 to direct their points toward the disk, and at the same time they 

 acquire stouter spinules on their concave side without, however, 

 forming a true hook like that seen in Ophientrema leucostictunn^ 

 Ophiotreta matura, etc. 



The peristomial plates are very large and transversely oval; they 

 recall those which Lyman has represented in Ophiolebes scorteus 

 ('82, pi. 41, fig. 8) , but their form is truly oval. 



Type of the genus. OpMogema punctata^ new species. 



OPHIOGEMA PUNCTATA, new species. 



Plate 29, figs. 7, 8, 9 ; plate 92, fig. 5. 



Localities. Albatross station 5166; Sulu Archipelago, Tawi Tawi 

 Group; Observation Island bearing N. 20 W., 8.52 kilometers (4.6 

 miles) distant (lat. 4 56' 10" N., long. 119 46' 00" E.) ; 177 meters 

 (97 fathoms) ; February 24, 1908; co. S. 



Numerous specimens (Cat. Nos. 40989, E. 219, U.S.N.M.). 



Albatross station 5167; Sulu Archipelago, Tawi Tawi Group; 

 Observation Island bearing N. 11 W., 10.4 kilometers (5.6 miles) 

 distant (4 55' 10" N., long. 119 45' 30" E.) ; 201 meters (110 

 fathoms) ; February 2-4, 1908; Co. 



Five specimens (Cat. No. 40990, U.S.N.M.). 



Albatross station 5168; Sulu Archipelago, Tawi Tawi Group; 

 Observation Island bearing N. 17 W., 7.78 kilometers (4.2 miles) 

 distant (lat. 4 56' 30" N., long. 119 45' 40" E.) ; 146 meters (80 

 fathoms) ; February 25, 1908. 



Four specimens (Cat. No. 40991, U.S.N.M.). 



Description. The specimens are none of them large, and the 

 diameter of the disk does not exceed 8 mm. The arms are about 50 

 mm. long. 



The disk is flattened, pentagonal, and more or less excavated in 

 the interradial spaces. The dorsal surface is flat and uniformly 



