876 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 



On page 37. The Rhinohatidcc are all ovoviviparous, a character 

 which distinguishes them from the oviparous Eaiidw. 



On page 38. BMnobatns leucorliynclius Giinther is not identical with 

 B. productus, and should be erased from the synonymy of the latter 

 species, which does not extend southward from California. In R.pro- 

 ductus the rostral ridges are armed with small spines above, and are 

 largely confluent auteriorly, not " separated along their entire length," 

 as stated in the text; anterior nasal valve not dilated laterallj' and not 

 extending to the inner edge of the nostril; first dorsal well behiud 

 tips of ventrals, not reaching nearly to the second. Females with a 

 small digitate flap, free behiud, above tip of snout. Color grayish, 

 without pale spots; snout paler, a black blotch beneath it. San Fran- 

 cisco to San Diego. The description quoted in the text, from Dr. 

 Streets, was taken from a specimen of E. leucorhynchus. R. productus 

 and R. lentiginosus belong to tlie subgenus RMnohatus, distinguished 

 from '■^ SyrrJiina^^ by the long, sharp snout and narrow nasal flaps. Our 

 two species of ^^ Syrrhina^'' have each recently been made the types of 

 new generic names, viz: ^'•Zapteryx^^ (Jor. & Gilb. Proc. U. S. Nat. Mas. 

 1880, 53: type Platyrhina exasperata J. & G.) and ^'- PlatyrJiinoidis-- (Gar- 

 man, Proc. U. S; Nat. Mus. 1880, 522: tyjje rjalyrhina triseriata J. & G.)- 

 Flatyrhinoidis is "distinguished from Syrrhina and Tryonorhina by the 

 labial fold, nasal valves^ and marginal series of spines, and from Platyr- 

 Idna by the fold, valves, separation of i)ectorals, and viviparity." Trygo- 

 norhina alveata Garman, Bull. Mus. Comj). Zool. 1880, 169, is identical 

 with Rhinobatus exasperatvs. 



In R. exasperaiMS the dorsals are well forward, the origin of first dorsal 

 being nearer hinder part of root of ventrals than front of se(;oiKl dorsal. 

 In R, triseriatus the origin of first dorsal is nearer root of caudal than 

 the hinder part of root of ventrals. In the latter the rostral ridges are 

 strongly convergent, in R. exaspcratus they are parallel. 



On page 30, add to description of 47, Torpedo caUfornica- Ay res: 

 Color very dark brown, with small round black spots, which are some- 

 times obsolete. Eyes small, the spiracles at a distance behind them 

 more than twice diameter of eye and more than length of spiracle; edges 

 of spiracles not fringed ; breadth of mouth about equal to its disti\Dce 

 from tip of snout. Teeth small, sfiarp, in few series. Tail a little 

 shorter than disk. First dorsal fin more than twice as large as second; 

 half of it opposed to the ventrals. Coast of California; thus far seen 

 only about San Francisco and Santa Cruz. 



