356 



THE PLAGIOSTOMIA. 



Raia chinensis. 



Raia chinensis Basilewsky, 1855, Ichth. Chin. Bor., p. 251 (non La Raie chinoise Lac6pI;de, 1788; 

 Rhina sinensis Schneider, 1801). 



Corpus supra cincreum, subtus albicans, Rajac Batis simile, eapite supra 

 aspero, rostro longato acuminato, subtus marginibus ab apice ejus usque ad 

 pinnarium pectoralium primam tertiam partem dentibus aculeatis et curvatis 

 instructo. — Maxillae dentibus robustis, planiusculis sed parvulo hamulo praedi- 

 tis armatae, Cauda carnosa, subcompressa, sursum per totum tractum scutis 

 anterioribus obtusis, posterioribus acutis, apicem prope appendice pinnata 

 parvula, ad basin pinna caudali (in utroque latere) carnosa, bifida, praedita, 

 disci longitudine brevier. Dorsum antrorsum uno scutello obtuso, caput in 

 singulo osse supraorbitali duobus scutellis. Anum aculeo longitudine usque ad 

 1-2 pollices, vulnera mortifera efficiente, praeditum, ideoque apud praedatum 

 piscem semper deliberatum esse ab eo Chinensibus dicitur. Habitat in Mare 

 orientali, provinciam Shan-dun alluente. Pekini rarissime occurrit. Longit. 

 disci cum cauda 1 pes et 8 poll. Latitude 1 pedis et 2 poll. 



Not recognized since the original description. 



South American species. 

 Raia extenta, nom. nov. 



Raia erinacea Ribeiro, 1907, Arch. Mus. nac, 14, p. 176, pi. 12, 13 (non Rata erinacea Mitchill). 



Disk shaped somewhat like that of R. erinacea, Plate 20, but snout shorter, 

 tail much longer and more slender. Outline concave opposite the spiracles, 

 convex opposite the eyes; snout short, length hardly greater than the inter- 

 spiracular width. Mouth waved; teeth in about 44 rows. Tail long, about 

 one and one half times the body, slender, tapering, extended behind the dorsals. 



Back rough with small spines; larger tubercles grouped on the snout, 

 opposite the eyes, around the orbital ridges, in a triangular area in front of the 

 shoulder girdle, along the anterior margin of the pectorals and in two or more 

 rows along the middle of the back; the median series of the back and tail is 

 irregular; on the tail there are two or more lateral series. Smoother spaces 

 occur above the abdomen, the basal and hinder portions of the pectorals, and 

 above the gills. The claspers of the male are of moderate length, slender and 

 pointed; tenacula are present near the outer angles. Adult about 9 inches. 



