76 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



elongated and worthy of the name of spines. These spines are some- 

 times thick and strong, rather well separated from each other (fig. 2), 

 or they may be slender, delicate, and closely placed (fig. 6), inter- 

 spersed or not with granules. On the photographs which I give (pi. 

 95, fig. 1) all the intermediate forms between the granules and the 

 true spines may be traced. 



In view of these variations. I have felt justified in uniting 0. grati- 

 osa and O. inutilis, between which I find all possible types of inter- 

 grades. 



On account of the arrangement of the mouth papillae, 0. gratiosa, 

 like the following species, should be placed in Verrill's genus Ophio- 

 treta. 



Ophiotreta gratiosa was discovered by the Investigator among the 

 Laccadive and Andaman Islands and in the Bay of Bengal at depths 

 between 352 and 263 meters (193 and 144 fathoms). The Siboga 

 dredged it at three stations among the Sunda Islands between 238 

 and 397 meters (130 to 218 fathoms). H. L. Clark has reported it 

 from the Japanese seas in from 80 to 128 meters (44 to 70 fathoms). 



OPHIOTRETA MATURA (Koehler). 



Plate 12, figs. 1-6 ; plate 13, figs. 1-5 ; plate 14, figs. 1-5 ; plate 15, figs. 1-3 ; plate 



95, fig. 2. 



Ophiacantha matura KCEHLEB ('04), p. 112, pi. 23, figs. 2-4. H. L. CLARK 

 ('15), p. 207. 



Localities. Albatross station 5349; Palawan Passage; Point Ta- 

 bonan bearing N. 85 E., 83.77 kilometers (45.2 miles) distant (lat. 

 10 54' 00" N., long. 118 26' 20" E.) ; 1,372 meters (750 fathoms) ; 

 December 27, 1908 ; co. S. 



One specimen (Cat. No. E. 179, U.S.N.M.). 



Albatross station 5359; Jolo Sea (lat. 8 12' 45" N., long. 120 37' 

 15" E.) ; 4,161 meters (2,275 fathoms) ; January 9, 1909. 



Four specimens (Cat. Nos. E. 183, E. 196, U.S.N.M.). 



Albatross station 5421; between Panay and Guimaras; Lusaran 

 Point Light bearing S. 27 E., 9.26 kilometers (5 miles) distant (lat. 

 10 33' 30" N., long. 122 26' 00" E.) ; 251 meters (137 fathoms) ; 

 March 30, 1909. 



One specimen (Cat. No. E. 182, U.S.N.M.). 



Albatross station 5424; Jolo Sea; Cagayan Island (S.) bearing 

 S. 11 W., 6.30 kilometers (3.4 miles) distant (lat. 9 37' 05" N., 

 long. 121 12' 37" E.) ; 622 meters (340 fathoms) ; March 31, 1909; 

 co. S. 



Three specimens (Cat. No. E. 201, U.S.N.M.). 



Albatross station 5425; Jolo Sea; Cagayan Island (S.) bearing 

 S. 14 E., 7.41 kilometers (4 miles) distant (lat. 9 37' 45" N., long. 



