196 Annals of the Carnegie Museum. 



the lateral line number from thirty-eight to forty, the count for the 

 typical specimen being incorrect (thirty-five). The color of the ventrals 

 abruptly coal-black at the base, where they sharply contrast with 

 the while breast, and abruptly white at the tips was found to be a 

 very constant character. 



Among these specimens are some small ones, which more or less 

 completely bridge the gap between this species and Xystes axin- 

 ophrys, making it evident that the latter form is the young of this 

 species. The type of X. axinophrys is one and three-quarters of an 

 inch long. In addition there are at hand two specimens from Port 

 Ludlow, and one from the San Juan Islands of the same size as the 

 type and agreeing with it in all particulars. A specimen a little under 

 three inches long and several a little larger, from the last locality, 

 show some decided intermediate characters, though more strongly 

 those 'of A. enivielane than of X. axinophrys. 



In the young (type of X. axinophrys) the supraocular spine is very 

 much enlarged, and stands outward over the eye as a high crest. 

 All of the ridges of the head are broken up into spines, and the body 

 spines are larger and sharper than in the adult. The ventral ridges, 

 which are spineless in the adult and lost on the caudal peduncle, are 

 in the young armed with as large spines as the other ridges, and con- 

 tinue as two distinct ridges to the base of the caudal. The dorsal 

 ridges, though not entirely uniting in the adult, are more distinctly 

 separate in the young. In the young the soft dorsal and anal are much 

 higher posteriorly, the rays not decreasing much in length backwards, 

 and are not so broadly adnate to the body. The cirri on the under 

 side of the head are only indicated by well developed fleshy tubercles, 

 but in the exact places and number that they aj'e in the adult. The 

 number of fin-rays, body-spines, and lateral line pores are the same. 

 (The type of X. axinophrys has eleven anal rays, not ten.) The color 

 of the young is like that of the adult. 



All of these changes are along the lines of those known to occur in 

 other agonoid fishes. 



Family LIPARID.E. 



47. Liparis callyodon (Pallas). 



Two specimens 2.5 and 3.5 inches in length, and a few small ones 

 a couple of inches in length were collected in the dredge. The species 

 has a much firmer body and tougher skin than L. dejinyi, as the speci- 



