66 PEKCTD.K. 



a. Large specimen. IJostuu. Presented by W. Winstone, Esq. 

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



Collection. 

 r. Adidt. New Orleans. From ili-. Ciimtug's Collection. 



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



e, f. Adnlt and half-grown : skins. New York. From Dr. Pamell's 



Collection. 

 g. Intestines of specimen h. 



The liver is proportionally small, divided by a slight incisiu'e into 

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

 slighter fm-row. There are four pyloric appendages, half as long as 

 the stomach. Two separated ovaria. Pseiidobranchise well developed. 



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

 behind ; the upper side in a straight line with the sm-face of the head, 

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

 into muciferous channels : the prpeorbital bone exhibits several 

 cavities, as in Acerinn cernua, 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 upper posterior comer of the 

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

 to the mastoid bone ; here it is tiu'ned up and backwards, passes the 

 upper articiilation of the suprascapula, and is lost near the sutiu'e of 

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

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

 nmning in a straight line fi-om 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 praeoperculum, as in Chilodlpterus, Apogon, 

 &c. ; it is continued on the lower sm-face of the mandibula, 

 where it opens by foiu- oval holes. I have formerly (Wiegm. Arch. 

 1855, p. 200) pointed oiit that such miiciferous channels are to be 

 found also in Perca and Luchperca, and I may now add, in aU 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 prffiopercidura, it may some day cause the separation of this 

 species from L. hipus, &c. 



The suborbital arch has no interior process for supporting the 

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

 The maxillary bone has the superior margin more convex than the 

 inferior one. Operculum ^vith two points, the iipper one short and 

 rounded, the lower prominent and acute. Prteoperciilum iinely 

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

 lower margin slightly convex ; intero2:)ereulum with some excessively 

 minute denticulations ; suboperculum entire. All the teeth are 

 villiform. arranged 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 vertebrae, and attached to the 

 haemal of the twelftli. 



