46 CONTKIIH'TIONS TO NORTH AMERICAN ICHTHYOLOGY - IV. 



:JW.-ITKOL,OPIIUS Mi!ller& Hcnle. 

 Round Winy Rays. 



it IIcnlc. ri;i-in>!(ini.'ii. l~-:'.7, 1?:'.: type rrolojiliiix iturantidcun Miiller & Henle 

 -= Ilnin fi-iti-inlii L;icc"pc<k>.) 



Disk oval or rhombic, the length and breadth not very unequal. 

 Snout rounded or slightly prominent. Skin smooth or somewhat prickly. 

 Tail rather short, little it' any longer than the disk, muscular, provided 

 with a distinct rayed caudal tin ; no dorsal liu. Upper part of the tail 

 with a strong serrated spine. Warm seas. Size small. ('<i><i-, tail; 



t.i'i^,,-. crest.) 



Skin perfect ly smooth. 



>*. I', liallcri Cooper. 



Disk nearly round, a little broader than long, with the anterior mar- 

 gins straightish, meeting in a slight angle. Snout (from the eyes) longer 

 than the width of the interorbital space. Tail somewhat shorter than 

 the disk. Skin without spines or prickles. ( 'olor light -brownish, with 

 inarblings and wavy lines of yellowish and dusky, sometimes with 

 yellowish spots, occasionally with wide, obscure dusky streaks, which 

 are crossed by similar transverse streaks. Belly yellowish tinged. 

 <'oast of California, from Point Concepcion southward: exceedingly 

 abundant in sheltered bays. L. 112. The smallest of our sting rays. 

 Closely related to the Australian U. crticiatttK, if not identical with it. 



( ooi.rr. I'n.r. C.'ilil'. Ac. \:it. Sci. iii. '..").) 



39. PTEBOPJLATEA Miill.i A M.-nl.-. 



(MiillrrA llciili-. I'la^i-.-ionii n. |-:',7, If.-: I ypr 7,V/n/ /hm /i/ I,.) 



DN X much broader than long, its anterior margins meeting in a very 



obi use niiglr. its outer angles more or less acute. Tail very short and 



vleml T. >horter tlian the disk, without iin, usually armed with a small 



. .iied >|iine. Skin smooth or very nearly so. Si/.e moderate or rather 



l-il~e. \\arm--ea-. (--;/, tins ; ~/.ar~>t, broad ; r:r;pn-/.ar: :-/. ail ancient 

 name of /'. ulhinlu.) 



'Spii .U ! \\ it lioiil ti-iil;ic|i-. 



''.*. I*. Iliarllll-a (Le Saeur) Miilli-r A ll.-nlc. Huttrrjlii 



Disk aoarcelj i \\ice as lu-oad as Long, covered with perfectly smooth 



skin. Tail about one tliird as long as the disk, with a very slight der- 



'"'I '"Id abo\ e ami below. Snout a little projecting, so that the anterior 



'' o| each pedoral i^ > ....... what coiicav<-. Color brownish olive, 



liiielx mail.led witli -i a\ i^li. an<l tinely speckh-d. Anterior edge of disk 



