OPHIUKANS OF THE PHILIPPINE AND ADJACENT WATERS. 305 



the same arrangement, are narrower in O. gymnatum. I have a 

 specimen of 0. gymnatum kindly sent me by Mr. Macintosh, and I 

 have been able to convince myself that the two species are entirely 

 different. 



The discovery of a new Ophiopteron raises the number of known 

 species in this interesting genus to six. 



OPHIOPTERON PUNCTO-COERULEUM Koehler. 



Plate 58, figs 5, 6, 7 ; plate 103, fig. 3. 



Ophiopteron pimcto-coeruleum K<E&LEB ('05), p. 114, pi. 12, figs. 5-7; pi. 

 15, fig. 6. H. L. CLARK ('15), p. 282. 



Locality. Albatross station 5150; Sulu (Jolo) Archipelago, in .the 

 vicinity of Siasi; Sirun Island (W.) bearing N. 34 E., 21.68 kilo- 

 meters (11.7 miles) distant (lat. 5 23' 20" N., long. 120 35' 45" 

 E.) ; 38 meters (21 fathoms) ; February 18, 1908; co. S., Sh. 



One specimen (Cat. No. 41306, U.S.N.M.). 



Notes. The diameter of the disk is 3 mm. ; the arms are from 20 

 mm. to 22 mm. long. 



On plate 58, figures 5, 6. 7, 1 give three photographs of this pretty 

 little species, which show better than the figures which I have pre- 

 viously published its elegant scheme of coloration and the arrange- 

 ment of the blue spots on the two surfaces of the body. In addition 

 the photographs on plate 103, figure 3, show the hook corresponding 

 to the first ventral arm spine, which is always well developed and 

 has sometimes two and sometimes three branches (a), the third 

 ventral spine (b) and one of the lateral spines (#), and two tentacle 

 scales (d). These last are moderately developed and end in a long 

 point which is usually single, though frequently there are two equal 

 or unequal points. 



Ophiopteron puncto-coeruleum was found by the Siboga at Flores, 

 Rotti, and the Aru Islands, at depths varying from 13 to 40 meters (7 

 to 22 fathoms). 



Order IV. CHILOPHIURIDA. 



Family OPHIOCHITONIDAE. 



OPHIOCHITON FASTIGATUS Lyman. 



Plate 76, figs. 1-8, 10, 11. 



Ophiochiton fastigatus LYMAN (78), p. 132, pi. 7, figs. 182, 183; ('82), p. 

 176, pi. 24, figs. 13-15 H. L. CLARK ('11), p. 133; ('15), p. 287. 



Localities. Albatross station 5348; Palawan Passage; Point Ta- 

 bonan bearing S. 89 E., 62.08 kilometers (33.5 miles) distant (lat. 

 10 57' 45 K, long. 118 38' 15" E.) ; 685 meters (375 fathoms) ; De- 

 cember 27, 1908 ; Co., S. 



55269 22 Bui. 100 20 



