PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 355 



Bcai cely elevated above surface of jaw, resembling the lateral teeth of 



Heterodontiis, but mtich smaller and without median crest. 



^ ,, 12-7-2-2-7-12 

 Teeth m.— _^^_^_^^ . 



We may note here, as further additions to the list of sharks on our 

 Pacific coast, the occurrence of Somniosus microcephalus (Bloch) Gill 

 in Puget's Sound; of Lamna cornuhica L. in Monterey Bay; and of 

 a species closely related to Eulamia lamia (Eisso) Gill in San Diego Bay. 

 The shark recorded by us as Pleuracromylon Iwvis (Proc. TJ. S. Nat. Mus. 

 1880, 52) is EMnotriacis Jienlei Gill. This species is not a genuine Triads, 

 and it appears to us to be congeneric with P. Iwvis, from which it differs 

 in the greater development of the basal cusps of the teeth. 



Table of measurements. 

 Species, Hexanchus corinus J. & G. ; sex, 9 . Locality, Xeah Bay, Washington Territory. 



Extreme length 



Body: 



(greatest height 



Head : 



Greatest lensth 



Greatest width 



Width of interorbital area 



Length of suont 



Length of cleft of mouth 



Distince from eye to spiracle . . . 



Length of nostril , 



Distance from mouth to nostril 



Height of first gUl-opening , 



Dorsal : 



Distance from snout 



Length of base 



Greatest height 



Anal : 



Length of base 



Greatest height 



Caudal : 



Length 



Pectorai : 



Length 



Ventral : 



Length of base 



Inches 

 and 



lOOths. 



43 



lOOths 



of 

 length. 



16 



12 



9 



5i 



6U 



5i- 



IJ 



4 



7 



53 

 6J 



ej 



6 

 4i 



32 



12 



8 



Indiana State University, 



Bloomington, October 11, 1880. 



