54 THE DISCOBOLI. 



lower edge of the centrum to the upper hinder angle of the upper plate 

 are strongly indicated. The anterior of the ventral rays is cultriform, more 

 curved than those shown on Plate VIII. Figs. 12-14, and the angle in the 

 other five, passing backward, varies from a right angle to a more acute. 



The liver is large ; the left lobes are about equal in size and scarcely 

 distinct, the incision being short ; the right lobe is shorter and not so broad. 

 The pyloric portion of the stomach is not as long as the cardiac. There 

 seem to be quite as many caeca as in L. Montagui, if not more ; thirty-three 

 were counted in a badly preserved example. Within the stomach there 

 were a number of Crustacea of various species, and amongst them a dozen 

 small stones, probably taken unintentionally with the crustaceans. This 

 fact suggests that other species habitually feeding amongst the weeds and 

 grasses would take in more or less of them while in pursuit of their animal 

 food, and in this way some of the Discoboles may have been led on to 

 depend eventually in some degree on vegetation for subsistence. 



Liparis calliodon. 



Plate VI. Fig. 1-5. 



Cijcloplerus calhjodon Pallas, 1831, Zoog. Ross.-Asiat., III. 75. 



Liparis callyodon Gthr., 1861, Cat, III. 162; L. calliodon. Bean, 1881, Pr. U. S. Mus., IV. 247, 271 ; 

 J. & G., 1882, Bull. 16 U. S. Mus., 743; Jor., 1887, Rep. U. S. F. Coram., 1885, 903. 



Liparis cyclopus Gthr., 1861, Cat., III. 163; Put., 1874, Pr. A. A. A. Sci., 338; J. & G., 1880, Pr. 

 U. S. Mus., 451, — 1881, Pr. U. S. Mus., IV. 62,-1882, Bull. 16 U. S. Mus.,. 743; Bean, 1881, Pr. 

 U. S. Mus., IV. 217, 271 ; Jor., 1887, Rep. U. S. F. Conim., 1885, 903. 



B. 6; D. 33-34; A. 28-29; P. 41-43; C. 20; Vert. 10 + 29. 



Moderately elongate and stout, compressed posteriorly, rather thick 

 behind the abdomen, tapering, and with upper and lower outlines slightly 

 convex, between dorsal and anal ; depth four and two thirds times in the 

 length, excluding the caudal. The body cavity in the female is more 

 than half of the total length, excluding the caudal. Head short, about 

 four times in the length, without the caudal, not quite as wide as long, 

 cheeks and occiput swollen, descent into the interorbital space abrupt, 

 internasal region prominent, snout broad, blunt, rounded, nearly one and 

 one fourth times the length of the orbit. Mouth anterior, opening slightly 

 upward, angle very little in front of a vertical from the anterior margin 

 of the orbit. Teeth small, tricuspid, lightly compressed at the apex, 

 harsh to the touch. Eye medium, more than one fifth of the length of 

 the head, one half of the interorbital space, four fifths of the preorbital 



