MUSEUM OF COMPARATIVE ZOOLOGY. 55 



Ophiothrix striolata Grube. 



Ophiothrix striolata. Verhandl. Schlesisch. Ges., 1867, Pt. III. p. 99. 

 Station 208, 18 fatkoms, 1 specimen. Zamboanga, Philippines, 10 fathoms, 

 1 specimen. 



Ophiothrix Martensi Lym. 



Ophiothrix Martensi. Bull. Mus. Comp. ZooL, III. 10, p. 234. 

 Aug. 7, 1874, 4 specimens. 



Ophiothrix exigua Lym. 



Ophiothrix exigua. BulL Mus. Comp. ZooL, III. 10, p. 236. 



Station 188, 28 fathoms, 1 specimen. Station 208, 18 fathoms, 1 specimen. 



Ophiothrix ciliaris? Mull. & Tiioscn 



Ophiothrix ciliaris. Syst. Asterid., p. 114. Lym. Bull. Mu3. Comp. Zool., 

 III. 10, p. 233, PL IV. tigs. 29-32. 

 Cebu, 95 - 100 fathoms, 1 specimen. 



Ophiothrix triglochis Mull. & Trosch. 



Ophiothrix triglochis. Syst. Asterid., p. 114. 

 Simon Bay, 5-18 fathomsj 3 specimens. 



OPHIOCHITON Lym. 

 Ophioehiton lentus sp. no v. 



Plate XIV. Figs. 398-400. 



Special Marks. — Three stout arm-spines. Under arm-plates thickened, but 

 not forming a distinct ridge. Scaling of disk smooth and uniform. 



Description of an Individual (Station 171). —Diameter of disk 13 mm. 

 Width of arm close to disk 2.5 mm. There are eleven short, sharp, stout, 

 close-set mouth-papillse on each angle, the two outermost and the one at the apex 

 being a little larger than the rest. Mouth-shields about as broad as long, of a 

 rounded heart-shape. Side mouth-shields extremely narrow, bent, wider without 

 than within, where they meet. Under arm-plates large, swollen but not ridged, 

 wider without than within, with lateral sides re-enteringly curved. Side arm- 

 plates short and stout, with a low thick spine-ridge. Upper arm-plates twice as 

 broad as long, of a fan- shape, with inner angle truncated, or a diamond-shape with 

 much rounded angles. Disk round, smooth, and flat, covered with small, pretty 

 uniform, rounded, overlapping scales, 2 or 3 in the length of 1 mm. Kadial shields 

 small, twice as long as broad, with much rounded corners, separated their entire 

 length by two large round scales ; length to breadth 2:1. Interbrachial spaces 

 below covered with scaling similar to but finer than that above. Genital open- 

 ings, long, extending from outer corners of mouth-shield, where there are a few 



