414 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



ous serrations on the dorsal spine; much larger eye, and blunter 

 head ; and from C. macrolophus^ in the larger eye, which is equal to 

 Hie length of the blunter snout, instead of being much smaller, as 

 in both adult (C. macrolophus) and young (C. lophotes), of the 

 Indian Ocean species. 



C. aioae, of Japan, a member of the same group, appears to be a 

 very distinct species,* although the large type of that species prob- 

 ably differs widely from smaller specimens, judging from the known 

 changes in G. marginatus and C microps. It is possible that awae 

 is based on a very large example of marginatus. 



C. semiscaber is also closely related to the following species, C. 

 tydemani, another member of the same group. 



Table of measurements in hundredths of length to anus. 



Type. 



Paratypes. 



Albatross station 



Total length in mm 



Length to anus in mm 



Length of head 



Length of orbit 



Width of interorbital 



Width of suborbital 



Orbit of preopercle 



Length of snout 



Length of upper jaw 



Length of barbel 



Depth of body 



Width of body 



Anus to ventral 



Ventral to isthmus 



Height of second dorsal spine. 



Height of third dorsal ray 



Length of base of first dorsal. 



Length of pectoral 



Length of outer ventral ray . . 

 Length of second ventral ray. 



5215 

 251 

 74 

 66 



18.5 

 13 



8 

 23 



18.5 

 20 



6 

 49 

 27 

 29 

 29 

 78 

 52.5 

 20 

 39 

 62 

 20 



5215 

 213 

 05 

 06 

 18 

 14 

 7 

 24 

 18.5 

 20 



55 

 27 

 30 

 27 



21.5 

 40.5 

 63 

 26 



5534 

 '110 

 28 

 69 

 19 

 15 



8 

 31 



1 A small pseudocaudal developed. 



(semiscaber i in reference to the basal armature of the dorsal spine.) 



15. CORYPHAENOIDES TYDEMANI (Weber). 



Macrurus tydemani Weber, Fische der 'fifi&o^a-Expedition, 1913, p. 15S, 

 pi. 1, fig. 6. 



Four specimens of this fine species were dredged at Albatross station 

 5648, in Buton Strait, near Celebes, at a depth of 559 fathoms; 

 bottom temperature, 39.2° F. 



There is included a complete description of our material for com- 

 parison with C . semiscaber and other related species. 



Fin-rays — first dorsal, II, 9 or 10; pectorals, 20 to 22; ventrals, 

 8 (8—9 in one). 



The shape of the bod}' and the course of the contours being simi- 

 lar in all respects to those of C. semiscaber, a repetition of the de- 

 scription seems unnecessary. 



1 See the note after the description of the next species. 



