536 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 40. 



appear to be identical with any Atlantic form. It has been com- 

 pared with the young of 0. gibbosus Linnaeus and found to differ in 

 that the latter has a four or five angled carapace. 



Carapace distinctly three angled, the greatly elevated dorsal ridge 

 surmounted by two distinct, flat spines; two suborbital spines; four 

 spines on the lateral ridge, one of which is beneath the eye, one below 

 the dorsal, two closely apposed and located on anterior half of ridge; 

 ventral surface convex in the middle, the lateral ridges projecting 

 rather strongly downward; snout pointed, a slight knob near its tip, 

 1.6 times diameter of eye, four in length to base of caudal; carapace 

 broadly closed both above and below the tail. D. 9 ; A. 9 ; P. 10 ; C. 10. 



Color in the preservative, yellowish; each facet of the sides of 

 carapace narrowly outlined in black and with a dark center; caudal 

 peduncle with a few oblong, dark spots. 



Three specimens from Misaki, measuring about 75 mm. long, show 

 no important individual variation. A much smaller specimen from 

 the Tokyo market, collected by Prof. K. Otaki, has the spines relatively 

 longer and stronger than the others. 



Type.— Cat. No. 68235, U.S.N.M., Misaki, Japan. Cotype, No. 21424, 

 Stanford University collection. 



Family SCOKPAENIDiE. 



SEBASTODES TANAK^E, new species. 



A dark colored species of Sebastodes charact3rized by short gill- 

 rakers, concave interorbital space, well-developed preopercular, 

 postocular, and tympanic spines, prominent parietal spines and 

 ridges, and a very long, naked maxillary is represented by a single 

 specimen from Hakodate. 



Head 2.6 in length to base of caudal; depth 2.7; depth caudal 

 peduncle 3.4 in head; eye 4.8; snout 4; maxillary 2.2; width inter- 

 orbital space 6.1; D. XIII, 13; A. Ill, 7; pores in lateral line 34. 



Nasal, preocular, postocular, and tympanic spines present, each 

 of which is heavy and high, but not very acute; postocular spine 

 preceded by a strong ridge; parietal ridges high, each with a low 

 posterior spine; preorbital with a broad, flat, triangular spine; pre- 

 opercle with three well-developed spines which are close together and 

 directed backward; below these are two low, rounded processes. 

 Opercular spines, two, broad and flat, the lower one nearly covered 

 with scales. Two humeral spines, the upper of which is short and 

 acute, the lower broad and flat, its tip serrated. Eye of moderate 

 size, its diameter somewhat greater than width of interorbital space. 

 Interorbital area flat, the high spines and ridges above eye making 

 it appear concave; a narrow trough in the middle formed by two low 

 frontal ridges which diverge somewhat posteriorly, as do also the 



