68 CALIFORNIA ACADEMY OF SCIENCES. 



We have examined four specimens from .23 m. to .33 

 m. long; collected by Agassis & Bourget, Thayer Exped. 

 at Maranhao; and a fifth, .21 m. long, collected by Pro- 

 fessor Agassiz at Bahia. 



3 7 a. Tachisurus grand icassis parmocassis. 



Arius parmocassis Cuv. & Val., Hist. Nat. Poiss. xv, 57, 1840 (Ba- 

 hia); Giinther, Cat. Fish. Brit. Mus. vol. v, 154 (copied). 

 Tachisurus grandicassis parmocassis Eigenm. &Eigenm. Proc. Cal. 

 Acad. 2d Ser. vol. i, 1888, 141 (Bahia; Sao Matheos; Maranhao), 



This variety differs from grandicassis only in having 

 the occipital process separated from the occiput by a 

 broader constriction and the process itself more elongate- 

 ovate. We have examined three specimens .18-. 21 m. 



a 17 b 



Bahia; Sao Matheos; Maranhao. Two of the specimens 

 have vomerine teeth, which probably form the " angle '* 

 mentioned by Cuvier & Valenciennes. 



37b. Tachisurus grandicassis stricticassis, 



Arius stricticassis Cuv. & Val. Hist. Nat. Poiss. xv, 58, 1840 (Cay- 

 enne); Giinther, Cat. Fish. Brit. Mus. \1. v (copied); Bleeker, 

 Silures de Suriname, 55, plate v, plate xii, fig. 4, 1864 (Surinam). 



Tachisurus grandicasis stricticassis Eigenm. & Eigenm. Proc. Cal. 

 Acad. 2d Ser. vol. i, 1888, 141 (Bahia; Maranhao). 



Habitat: Bahia to Surinam. 



This variety differs from var. parmocassis by having 

 the occipital process still narrower, the margins being 



