228 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



band is much broadened, and its borders are indefinite ; they are not 

 quite so clearly defined as in the type specimen. 



This specimen differs from the type of O. elegans by a slight dis- 

 similarity in the armature of the disk, which consist exclusively of 

 club spines ; these become stouter on the ventral surface, and in the 

 broadening of the dark band which runs along the middle of the 

 dorsal surface of the arms. 



Liitken's type came from the China Sea. 



OPHIOTHRIX EXIGUA Lyman. 



Plate 40, figs. 1-4 ; plate 98, fig. 4. 



See for bibliography : 



Ophiothrix exigua Kcehxeb ('05), p. 86, pi. 9, figs. 15, 16; ('05b), p. 458; 

 ('07), p. 332.— McIntosh ('11), p. 164.— H. L. Clark ('15) p. 272; ('15a), 

 p. 90. 



Localities. — Albatross station, 5160; Sulu (Jolo) Archipelago, 

 Tawi Tawi Group; Tinakta Island (N.) bearing S. 72° W., 5.10 kilo- 

 meters (2.75 miles) distant (lat. 5° 12' 40" N., long. 119° 55' 10" E.) ; 

 22 meters (12 fathoms) ; February 22, 1908 ; S. 



One specimen (Cat. No. 41300, U.S.N.M.). 



Albatross station 5181; off eastern Panay; Antonio Island (S.) 

 bearing S. 63° W., 12.23 kilometers (6.6 miles) distant (lat. 11° 36' 

 40" N., long. 123° 26' 35" E.) ; 47 meters (26 fathoms) ; March 27, 

 1908 ; M., f ne. S. 



Two specimens (Cat. No. 41298, U.S.N.M.). 



Albatross station 5401; north of Cebu; Tanguingui Island Light 

 bearing N. 79° W., 42.62 kilometers (23 miles) distant (lat. 11° 24' 

 45" N., long. 124° 06' 00" E.) ; 55 meters (30 fathoms) ; March 16, 

 1909 ; f ne. S. 



Two specimens (Cat. No. 41299, U.S.N.M.). 



Philippines, without further locality. 



One specimen (Cat. No. 41297, U.s".N.M.). 



Notes. — The specimens are well characterized. The dorsal surface 

 of the disk shows only slender club spines terminated by elongated 

 spinules. 



In previous memoirs I have already discussed the characters of 

 O. exigua. As this species has often been confused with other species 

 of Ophiothrix, notably by Marktanner and by de Loriol, who have 

 not distinguished it from O. comata, it has seemed to me worth while 

 to include here some photographs of the Albatross specimen. The 

 under arm plates always have their distal border more or less 

 strongly notched, and it is noticeable that this notching is particu- 

 larly deep in the specimen from station 5160, shown in figure 4. 



