i8o 



SMITHSONIAN MISCELLANEOUS COLLECTIONS [VOL. 50 



much reduced. Two species are known from the North Pacific, 

 L. muticus and L. azvcc. 1 



Fig. 40. — Lethotremus vinolentus. After Jordan and Starks. 



Cyclopteroides has small spinigerous tubercles well separated, but 

 arranged in eight regular longitudinal rows and the two dorsals are 

 partly enveloped in the skin ; the ventral disk is abdominal and fur- 

 ther back than in the other genera. The only species (C. gyrinops) 

 has been found in Alaskan waters. 



<2>. 



JiS 



sK 



Fig. 41. — Cyclopteroides gyrinops. 

 After Garman. 



The Liparopin-E have no external spinous dorsal, the back in front 

 of the soft dorsal being completely finless. Two genera have been 

 distinguished. 



1 Another species has been added to Lethotremus as L. vinolentus by Jordan 

 and Starks. It differs apparently in physiognomy as well as by the develop- 

 ment of the fins and the presence of scattered spinous tubercles on the head 

 and fore part of the body; it is scarcely a natural associate of the other species, 

 and doubtless Jordan and Starks may hereafter distinguish it generically. The 

 only known specimen was in poor condition and obtained in Puget Sound near 

 Seattle. 



