66 



PKRC1D.K. 



(t. Large specimen. Boston. Presented by W. Winstone, Esq. 

 6. Adult female : skeleton. New York! From Mr. Brandt's 



Collection. 

 r. Adult. New Orleans. From Mr. Cuming's Collection. 



d. Half-grown. America. Old Collection as Perca totog. 



e, f. Adult and half-grown : skins. New York. From Pr. Paniell's 



Collection. 

 g. Intestines of specimen h. 



The liver is proportionally small, divided by a slight incisure into 

 two parts, the left of which is larger, and distingxiished by a still 

 slighter furrow. There are four pyloric appendages, half as long as 

 the stomach. Two separated ovaria. Pseudobranchiae well developed. 



Skeleton. — The paroccipital crest is high, triangular, pointed 

 behind ; the upper side in a straight line with the surface of the head, 

 obliquely ascending. The ridges at the side of the skull are modified 

 into muciferous chanuols : the pra;orbital bone exhibits several 

 cavities, as in Acerlna cernna, but not quite so deep ; they com- 

 municate with the suborbital arch, which is narrow and forms the 

 middle part of this channel ; at the ujiper posterior comer of the 

 orbit the channel is continued by an excavated bony ridge, running 

 to the mastoid bone ; here it is turned up and backwards, passes the 

 upper articiilation of the suprascapiila, and is lost near the suture of 

 the supraoccipital and of the frontal bones. A second pair of 

 muciferous channels is found at the upper siu'face of the head, 

 running in a straight line from the maxillary bone between the 

 orbits to the middle of the frontals, opening by two or three 

 lateral holes. The third muciferous channel runs in an elevated 

 second ridge of the prgeoperculum, as in Chilodipterus, Apogon, 

 &c. ; it is continued on the lower surface of the mandibida, 

 where it opens by four oval holes. I have formerly {Wiegm. Arch. 

 1855, p. 200) pointed out that such muciferous channels are to be 

 found also in Perca and Lucioperca , and I may now add, in all the 

 Percoids, but less developed : not forming a good generic character 

 by itself, but combined with the fine serrature at the lower limb 

 of the proDoperculum, it may some day cause the separation of this 

 species from L. lupus, &c. 



The suborbital arch has no interior process for supporting the 

 eye-ball from beneath, as is obsei-ved in a great many Percoids. 

 The maxillary bone has the superior margin more convex than the 

 inferior one. Operculum with two points, the upper one short and 

 rounded, the lower prominent and acute. PriEopercalum finely 

 serrated throughout ; posterior margin straight-lined ; angle rounded ; 

 lower margin slightly convex ; interoperculum with some excessively 

 minute denticulations ; suboperculum entire. All the teeth are 

 villiform, an'anged in bands: those of the vomer form an obtuse 

 angle. The interior plate of the pubic bones is broad, in imme- 

 diate contact with that of the other side, without leaving an inter- 

 space between. The first interhaemal is of moderate strength, equal 

 to the length of the second to sixth vertebi-ae, and attached to the 

 haemal of the twelfth. 



