, 
oe PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM 
a conspicvrous cutaneous fold below and a smaller but evident one 
above. Upper jaw considerably curved, with a slight convex protuber- 
ance in front, which fits into a slight émargination in the lower jaw, 
which is convex, its outlines corresponding to the curves of the upper 
jaw. Dands of teeth wider in front than laterally. Inside of mouth 
behind the lower jaw with three fleshy processes. Teeth about 23; 
about 8 in a cross-series in the upper jaw and 10 in the lower. 
Color light brown, somewhat marbled with darker, but without dis- 
tinct spots; tail blackish ; belly white. 
Skin everywhere perfectly smooth in all the specimens seen. 
Measurements of two specimens. 
, No. 1. Wo. 2. 
ihenowhsordiska (imeanehes) ace cee sees see nese Erte Ge vO 8. 50 
Menothvofitail) Gn anehes))5 222. «ss-2)e) sees esl ee) =e 12. 25 12. 40 
Breadthvotdiskssoa<.52-. ee o-(s oes Percentage of length of disk.... 1.04 1.10 
Distance from disk to dorsal fold -.-. se ska, 4D 250 
Length of dorsal fold...-...-.-.--.- ef scse, w LOO. Suedens 
ideiohtiot dorsal fol@ysas.cc -s2ss2 == ee seen Wiley OIG, 
Distance from root of tail to anal fold- i eee ne ek . 375 
Wencthyotvamall/ folds 2.5. 22 essen a coco OG . 305 
Merohtiotanall fol di joe scams ti scienie ef societ  OP2D) seO22S 
Length of snout from eye....-.-.---- oe Seng coil .18 
Mmberorbital width sete. sssss.--2-—- yi oom a5) SiG 
Snout to scapular ridge........-.-..- n s2e5 | POY . 339 
Distance between nostrils .....----. * ct MLO 15 
Wadthiotmoutheee occas sonoma ete Way aa Seco, melt alli 
Length of branchial area ..---.---.- e sano sa lithi .18 
Width of branchial area (in fr oni). acs 4 Binh pemee s30 
IMMORAL IO) WEN SASS gecaooonaKes acoode es cease | fad .70 
Length of caudal spine-....-----.-- ee Eee) (LOS6) . 330 
Distance of spine from disk..-..-.-- He anos: 3 OD . 320 
This species is known to us from four female specimens taken in San 
Diego Bay. These range in length from 18 to 24 inches, and are there- 
fore but partially grown. Several other specimens, some of them larger, 
have been seen in a pile of refuse fish thrown away by the Chinese fish- 
ermen. These were, however, too far gone for preservation or descrip- 
tion. 
52. Platyrhina exasperata sp. nov. 
Disk rhombic, about as broad as long, the snout prominent, but 
bluntish at the tip, the angle made by the anterior margins of the pec- 
torals rather less than a right angle, but the snout itself rounded at the 
tip. Anterior margin of pectorals nearly straight. 
Eyes rather large; nasal ridges well separated, little converging, not 
meeting eee Mouth rather narrow, slightly convex forward. 
Teeth about 3%. Nostrils with a large anterior flap, which projects back- 
wards and covers a narrower posterior flap. 
Ventral fins separate, entire, their outer margin slightly convex. 
Tail depressed, with a broad lateral fold; dorsal fins comparatively 
