OPHIUKANS OF THE PHILIPPINE AND ADJACENT WATERS. 341 

 OPHIARACHNELLA INFERNALJS (Miiller and Troschel). 



See for bibliography : 



Pectinura infernalis KOSHLEB ('05), p. 7; ('07), p. 285. H. L. CLABK ('08), 

 p. 289. KCEHLEB ('10), p. 289. MACINTOSH ('11), p. 157. 



Ophiarachnella infernalis H. L. CLARK ('09), p. 124; ('15), p. 305. MATSU- 

 MOTO ('17), p. 324. 



Locality. Tataan, Simulac; February 19, 1908. 



One specimen (Cat. No. 41173, U.S.N.M.). 



Notes. The specimen is of small size, the diameter of the disk 

 being only 10 mm. 



In 1910 I gave the reasons why I continue to distinguish O. infer- 

 nalis from 0. similis, which I described in 1905, in spite of the con- 

 trary opinion of H. L. Clark. I maintain absolutely that separa- 

 tion. Furthermore, H. L. Clark has now recanted on his previous 

 opinion, and in his magnificent work of 1915 he includes as distinct 

 species both 0. infernalis and O. swnilis ('15, p. 305 and 306, Nos. 

 1082 and 1096). 



OPHIARACHNELLA NITENS (Kcehler). 



Pectinura nitens KCEHLEB ('05), p. 10, pi. 1, figs. 10-12. 

 Ophiarachnella nitens H. L. CLARK ('09), p. 125; ('15), p. 306. 



Localities. Albatross station 5139; in the vicinity of Jolo; Jolo 

 Light bearing S. 51 W., 5.79 kilometers (3.6 miles) distant (lat. 

 6 06' 00" N., long. 121 02' 30" E.) ; 37 meters (20 fathoms) ; Febru- 

 ary 14, 1908. 



One specimen (Cat. No. E. 320, U.S.N.M.). 



Albatross station 5152; Sulu (J616) Archipelago; Tawi Tawi 

 Group; Pajumajan Island (W.) bearing S. 2 W., 3.22 kilometers 

 (2 miles) distant (lat. 5 22' 55" N., long. 120 15' 45" E.) ; 62 

 meters (34 fathoms) ; February 18, 1908. 



One specimen (Cat. No. E. 319, U.S.N.M.). 



Albatross station 5161; Sulu Archipelago, Tawi Tawi Group; 

 Tinakta Island (E.) bearing N. 12 W., 2.90 kilometers (1.8 miles) 

 distant (lat. 5 10' 15" N., long. 119 53' 00" E.) ; 29 meters (16 

 fathoms) ; February 22, 1908. 



One specimen (Cat. No. 318, U.S.N.M.). 



Notes. The specimen from station 5139 is the largest, and the 

 disk measures 18 mm. in diameter; it is therefor larger than my 

 type specimen in which this diameter reaches only 16 mm. The 

 two others are smaller, the diameter of the disk measuring respec- 

 tively 10 mm. and 7 mm. 



These three specimens agree very well with the type, which was* 

 collected by the Siboga in Sapeh Strait, in 69 meters (38 fathoms). 

 I find, however, this slight difference, that in the largest specimen 

 the mouth shields are a little elongated and their proximal angle 



