74 Memoir Sears Foundation for Marine Research 



(i), l8g6: 63 (descr. after Giinther, 1870; Mexico, "probably the east coast"); Rep. U. S. Comm. 

 Fish. (1895), 1896: 220 (listed, Mexico); Garman, Mem. Harv. Mus. comp. ZooL, j6, 1913: 282 

 (descr. after Giinther, 1870). 



Genus Zapteryx Jordan and Gilbert 1880 



Zapleryx Jordan and Gilbert, Proc. U. S. nat. Mus., j, 1880: 53; type species, Platyrhina exasferata Jordan 

 and Gilbert (Proc. U. S. nat. Mus., J, 1880: 32). California. 



Generic Synonyms: 



Syrriina (subgenus oi Rhinobatus) in part, Miiller and Henle, Plagiost., 1841: 113. 



Syrrhina Garman, Proc. U. S. nat. Mus., J, 1881: 521; type species, Platyrhina exasferala Jordan and Gil- 

 bert 1880; see discussion, p. 48, footnote 17. 



Generic Characters. Disc wedge-shaped anteriorly and strongly flattened dorso- 

 ventrally, outer pectoral margins rounded and tail stout, as in Rhinobatos^ but disc 





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-•/ 







Figure 17. Zapleryx exasperata, female, 207 mm 

 long, from San Diego, California (Harv. Mus. 

 Comp. ZooL, No. 36022). Large tubercles and 

 smaller denticles along mid-dorsal line of disc, 

 about 10 X- 



relatively broader (cf. Fig. 18 with 14, 16), so that the general appearance is more 

 skate- or ray-like. Nostrils entirely separate from mouth and approximately transverse. 

 Flap-like expansions of anterior margins of nostrils almost wholly covering inner halves 

 of nasal openings and extending inward considerably beyond inner corner of nostril 



