876 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY - IV. 



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

 which distinguishes them from the oviparous Raiidce. 



On page 38. Rlii/wbattis leucorliynclius Giiiither is not identical with 

 /'. product UK, and should be erased from the synonymy of the latter 

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

 iliu-tiix the rostral ridges, are armed with small spines above, and are 

 largely confluent anteriorly, not "separated along their entire length,'' 

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

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

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

 small digitate flap, free behind, 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 R. leucorlnjnchus. R. product us 

 and K. lentiyuntxux belong to the subgenus Rhinolatus, distinguished 

 from " Syrrhina" by the long, sharp snout and narrow nasal flaps. Our 

 two species of "Syrrhimi" have each recently been made the types of 

 new generic names, viz: ll - Znptrryx" (Jor. & Gilb. Proc. U. S. Nat. Mus. 

 1880, 5.">: type J'latyrlthut c.wtt<j>er<ttfi J. & G.) and "Flntyrltinoidiv" (Gar- 

 iiian, Proc. U. S. Nat. .Mus. 1SXO, .li'L': type J'lalyrliina triseriata J. & G.). 

 Platyrhinoidis is u distinguished from Kyrrltina and Tryonorliinn by the 

 labial told, nasal valves, and marginal series of spines, and from riatyr- 

 liiiin by the fold, valves, separation of pectorals, and viviparity." Tryyo- 

 norliin'i dlrcntit Garmaii. I5ull. ^Iiis. Comp. Zool. 1880, 100, is identical 

 with Iiltinohntiin CMixpenttus. 



In R. ejr(ix/i< fain* Hie dorsals are well forward, the origin of first dorsal 

 being nc;irer hinder part uf root of ventrals than front of second dorsal. 

 In /.'. t,-i\< rid/us the ori.uin of first dorsal is nearer root of caudal than 

 the hinder part of root of ventrals. In the latter theros'ral ridges ;ire 

 strongh ctiinTrgent, in R. r./y/.s-/// TiitHN they are ]arallcl. 



On pa-r 39, add to description of 47, Torpedo califuniicn Axres: 



Color \er\ dark brown, \\ithsmall round black spots, which are some- 

 times obsolete. K\ es small, the spiracles ;it a distance behind them 

 more than twice diameter () f e\ e ;ind more t han len-t h of spir;icle: edges 

 of spiracles not tnn.ued ; breadth of mouth about equal to its distance 

 from tip of snout. Teeth small, sharp, i:i few series. Tail a little 

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

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

 only about San Francisco and Santa Cruz. 



