530 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



INTERGRADES BETWEEN IIYMENOCEPHALUS STBIATISSIMCS STRIATISSIMUS AND H. S. TOKVTTS. 



List of stations. 



The status of these 23 specimens and their relation to the two 

 subspecies occurring on each side of their range have already re- 

 ceived consideration. They resemble H. s. torvus in the small, ob- 

 liquely elongate orbit, and in the short barbel, but usually agree with 

 H. s. striatissimus in the number of ventral rays : 21 specimens have 

 8 on each side, and 2 have 8 on one side and 7 on the other. Over 

 TO fins have been counted in striatissimus, and none were found with 

 7 rays; 306 fins counted in H. torvus include none with 8. 



49. HYMENOCEPHALUS STRIATISSIMUS TORVUS Smith and Radciiffe. 



Hymenocephalus torvus Smith and Radcliffe, Proc. U. S. Nat. Mus., vol. 

 43, 1 01:!. ]». 110, pi. 32, fig. 2. 



The type-specimen Avas stated, in the original description, to have 

 been dredged at station 5548, near Jolo. This statement is erro- 

 neous, as the specimen was dredged at Albatross station 5508, off 

 northern Mindanao, at a depth of 270 fathoms. 



The lateral line is on the fourth row of scales below end of first 

 dorsal (not the sixth, as originally described). The scales are thin 

 and deciduous, as usual in the genus; they are weakly armed with 

 small spinules in quincunx order. The abdominal region, which is 

 striated exactly as in typical striatissimus, is completely covered by 

 spineless scales, as in the two other subspecies. 



The roof of the buccal cavity is mostly silvery, but dusky just 

 within the mouth and whitish on the tongue. The branchial cavity 

 is brownish above, but mostly silvery below and whitish along the 

 margin of the opercular and branchiostegal membranes. The par- 

 ietal peritoneum is brownish, underlain with silvery. 



The orbit is smaller in this subspecies than in typical striatissimus, 

 and is not circular, as originally described ; its vertical height is con- 

 tained about 1.2 times in the oblique length, which is contained from 

 1.1 to 1.4 times in postorbital length of head (measured in 100 

 specimens). 



