REVISION OF THE FISH FAMILY LIPARIDAE 41 



CEYSTALUCHTHY3 



Crystallichthys differs from Careprodus in the blotched coloration 

 and the peculiar slitUke and notched pupil. It apparently has been 

 derived from the Careprodus stem, possibly after the loss of the dorsal 

 notch. 



CRYSTALUAS 



Crystallias has apparently been derived from a Crystallichthys 

 mirahilis-like ancestor. It resembles this species in coloration, 

 shape of head and body and the folds on the snout. It differs from 

 C. mirahilis in the presence of barbels on the snout and the absence 

 of the notch in the pupU or the presence of a flap on the upper edge 

 of the iris. Kudiments of barbels are possibly present in Crystal- 

 lichthys mirahilis in the folds of skin between the pores on the snout. 



GYRINICHTHY3 



The genus Gyrinichthys differs from Careproctus solely in the 

 greatly reduced gill slit. It apparently has been derived from the 

 specialized simple toothed species of Careprodus. With the discovery 

 of a species of Careproctus having the gill slit but little smaller than 

 in some of the known species the genus Gyrinichthys will have to be 

 reduced to synonomy. 



ELASSODISCUS 



^ Elassodiscus differs from Careprodus in the rudimentary condition 

 of the ventral disk, the rays being absent. The nearest approach 

 to this condition is found in Careproctus ostentum, in which the disk 

 is minute but perfect in structure. Elassodiscus, however, has been 

 derived from a different line of development than C ostentum for 

 the teeth are stronglj^ trilobed in the former and simple in the latter 

 and related species. The species of Careproctus with trilobed teeth 

 all have the disk well developed. We must then conclude that 

 there is a considerable gap between Elassodiscus and the generalized 

 species of Careprodus with trilobed teeth from which it must have 

 developed. 



PARALIPARIS 



Paraliparis apparently has been derived from the Elassodiscus 

 stem. The only difference between the genera is the absence of 

 the rudimentary disk in Paraliparis. The genus could not hav« 

 arisen from an ostentum-like ancestor, for the most primitive species, 

 P. dactylosus, has trilobed teeth. It is possible that the Careproctus 

 ostentum branch gave rise to species without disks and that Parali- 

 paris is diphyletic. 



RHIN0UPARI3 



Rhinoliparis differs from Paraliparis solely in the presence of 

 barbels on the snout. The presence of lobed teeth in Rhinoliparis 

 harhulijer suggests that the genus arose from the primitive Parali- 

 paris stem. 



