330 BULLETIN 100, UNITED STATES NATIONAL. MUSEUM. 



OPHIOMASTIX FLACCIDA Lyman. 



See for bibliography : 

 Ophiomastix flaccida Kcehlee ('05), p. 67; ('07), p. 329. — H. L. Clabk 

 ('15), p. 296. 



Locality. — Mactan Island; tide pools; August 3, 1909. 

 One specimen (Cat. No. 40915, U.S.N.M.). 



OPHIOMASTIX LUTKENI Pfeffer. 



Ophiomastix liitkeni Pfeffer ('00). — H. L. Clabk ('15), p. 296, pi. 16, 

 figs. 3, 4.— Matsttmoto ('17), p. 349, fig. 98. 



Locality. — Albatross station 5109; China Sea, off southern Luzon; 

 Corregidor Light bearing N. 42° E., 47.81 kilometers (25.8 miles) 

 distant (lat. 14° 03' 45" N., long. 120° 16' 30" E.) ; 22 meters (12 

 fathoms) ; January 15, 1908 ; Co. 



One specimen (Cat. No. 40926, U.S.N.M.). 



Notes. — The specimen is in poor condition; two arms are broken 

 off, and the three others are strongly bent upward above the disk, of 

 which a part of the dorsal surface is torn off ; it is nevertheless very 

 well characterized. 



Without assuming the club-like form which is sometimes met with, 

 the dorsal spine is considerably developed on each third or fourth 

 segment, becoming greatly elongated and thickened. The general 

 coloration is very dark and almost black, with yellowish bands on the 

 dorsal surface of the disk, the spines of which are of a light yellow 

 washed with dark. The arms show on each segment a yellow trans- 

 verse band on the dorsal surface as well as on the ventral; toward 

 their long borders, the mouth shields show two broad yellow longi- 

 tudinal striae, and some yellow dots are also to be seen on the oral 

 plates as well as on the mouth papillae. 



H. L. Clark has published two excellent photographs and Matsu- 

 moto some figures of this species which was only known from 

 Pfeffer's description. This author's type series came from Ternate 

 and from Cebu, and H. L. Clark's specimen from the Riu-Kiu 

 Islands (Japan). 



The species has not yet been found outside of these localities. 



OPHIOMASTIX MIXTA Ltitken. 



See for bibliography : 

 Ophiomastix mixta Kcehleb ('05), p. 68, pi. 6, fig. 15; pi. 15, fig. 1.— H. L. 

 Clabk ('11), p. 256, fig. 126; ('15), p. 296.— Matsumoto ('17), p. 348, 

 fig. 97. 

 Locality. — Albatross station 5109; China Sea, off southern Luzon; 

 Corregidor Light bearing N. 42° E., 47.81 kilometers (25.8 miles) 

 distant (lat. 14° 03' 45" N., long. 120° 16' 30" E.) ; 22 meters (12 

 fathoms) ; January 15, 1908 ; Co. 



