20 CALIFORNIA ACADEMY OF SCIENCES. 



III. Dysichthys. 



DysicUhys Cope, Proc. Acad. Nat. Sci. Philad. 1874, 

 133 (coracoideiis). 



Type: Dysichthys coracoideiis Cope. 



This genus is said to differ from Bmioce2)halus in pos- 

 sessing maxillary barbels only. 

 9. Dysichthys coracoideus. 



Dysichthys coracoideus Cope, 1. c; id. Proc. Am. Philos. Soc. 17, 

 1878, 681 (Nauta); E. & E. Proc. Cal. Acad. Sci. 2d Ser. ii, 

 1889, 50 (name only.) 



Habitat: Nanta. 



Dorsal fin adnate, its first ray little nearer tip of snout 

 than to base of caudal. Nuchal shield with strong ridges 

 and scalloped borders; length of coracoid processes equal 

 to the distance between them; pectoral spine extending 

 beyond base of ventrals; maxillary barbels to base of 

 pectorals. Belly, tail and fins black; throat and belly 

 white speckled. Shield brown, with paler specks. D. 

 5; A. 7. (Cope.) 



Subfamily PLATYSTACIN^. 



IV. Platystacus. 



Aspredo Linnaeus, " Mus. Ad. Fred. 73." 



'> Aspredo BleekeT , Nederl. Tijdschr. Dierk. i, 1863, 

 1 17 {hatrachus=asp)redo). 



Platystacus Bloch, Ausl. Fische, viii, 1794 (sp.) 



^'Platystacus Bleeker, 1. c, 118 {cotylephorns). 



y'Cotylephoriis Swainson, Fish, Amph. & Rept. ii, 308 

 1839 {hlochii--=cotylep)horus). 



'> Aspredinichthys Bleeker, 1. c. 118 (tibicen). 



Type: Silu^ms asprexlo Linnaeus. 



The name Aspredo, according to the generally adopted 

 rules of nomenclature, is not available for this genus. 

 It was proposed before 1758, but not adopted in the Xth 

 edition of the Systema Naturae; the name Plcdystacus, 



