O CALIFORNIA ACADEMY OF SCIENCES. 



fourth anal ray. Base of dorsal 2y^ in its distance from 

 the middle caudal ray. Highest dorsal ray equals head 

 minus opercle. Adipose fin nearer dorsal than caudal. 

 A white area just in front of the caudal on the dorsal sur- 

 face, another on the ventral surface. Phosphorescent 

 spots arranged as in M. calif orniensc, the three about the 

 pectoral forming a straight vertical line instead of a tri- 

 angle. 



Scales very thin, silvery or but slightly coerulescent, 

 those of the lateral line much deeper than the others, twice 

 as large as those on the tail, about 13 larger than those of 

 the body. 



Light, dotted with black, appearing lighter than any 

 other species of this family found about San Diego. 



Mr. Samuel Garman has kindly sent us tracings of 

 Myctoplunn comscans and hiaiis. In Icucopsanini the scales 

 of the lateral line are not so deep, the snout sharper, the 

 pectoral narrower and placed lower than in comscans, 

 which is identical with the type of Alysia. 



Tarletonbeania gen. no v. 



Type: Tarletonbeania tcniia sp. nov. 



Related to MyctopJinvi, differing from related genera in 

 having no externally developed lateral line. 



Anal basis much longer than dorsal. Pectoral placed 

 high as in MyctopJunn. Caudal peduncle extremely 

 slender. 



Myctophum crenularc Jordan & Gilbert probably belongs 

 to this genus. Dr. Gilbert informs us that it has no lat- 

 eral line. It seems to have been nearly simultaneously de- 

 scribed by J. & G. and by Dr. Tarleton H, Bean, for 

 whom this genus is named. 



