1908.] NATURAL SCIENCES OF PHILADELPHIA. 61 



of that of upper, and height of fin at this point about 2f in length of its 

 base. Upper caudal lobe broad, its expansion at end nearly equal to 

 width of mouth or about 3f in its length. Pectoral broad, larger than 

 first dorsal, and reaching f to ventral, with posterior margin a little 

 incised. Ventral inserted a little nearer origin of first dorsal than that 

 of anal, and reaching f to origin of latter. Clasper equals posterior 

 anal point. 



Color in alcohol deep gray-brown on back, becoming paler gray on 

 sides, and lower surface whitish. Upper surface of snout pale brown- 

 ish. Teeth all whitish. Iris livid grayish and pupil slaty. Nictitat- 

 ing membrane pale like side of head. Dorsals pale brownish, upper or 

 outer portion of lobe dusky to blackish and posterior point becoming 

 very pale to whitish. Caudal pale brownish, end of upper lobe and 

 notch behind lower dusky to blackish, fin otherwise more or less pale. 

 Pectoral dusky or blackish above, pale to grayish below. Ventral and 

 anal whitish like lower surface of body. 



Length 12| inches. 



No. 582, A. N. S. P., cotype of G. zyopterus Jordan and Gilbert. San 

 Francisco, California (U. S. F. C. No. 27,190). 



Galeooerdo tigrinus Mailer and Henle. 



Head 6|^; depth llf; width of head If in its length; snout 3; width of 

 mouth 2^jj; space between tip of snout and front of mouth 4; inter- 

 orbital space If; pectoral H; base of ventral 4J; caudal nearly 2 in rest 

 of body. Body broad, depressed, and trunk rather slender posteriorly. 

 Caudal peduncle broad, and side from below second dorsal bluntly 

 keeled till opposite middle of lower elongate caudal lobe. Head 

 large, very broad, depressed. Snout broad, rounded. Length of pre- 

 oral region about f width of mouth. Eye anteriorly lateral, with 

 nictitating membrane. Mouth large, beginning well before eye, and 

 gape extends one diameter behind latter. Corner of mouth with long 

 outer fold. Teeth about |f, broad, compressed, directed laterally,, 

 finely serrated along margins, and with five small cusps externally. 

 Tongue broad, not free. Lips rather thin. Nostrils lateral, with 

 small flaps, and nearer front edge of snout than front of mouth. Inter- 

 orbital space convex. Anterior gill-openings large, third largest, and 

 last two over base of pectoral. Peritoneum silvery. Shagreen very fine. 

 First dorsal inserted opposite posterior basal edge of pectoral, with 

 sharp point behind, and height of fin a little less than base. Second 

 dorsal inserted about midway between caudal pits and origin of ventral. 

 A narrow median low keel along back between dorsals. Anal small, 

 inserted below first third of base of second dorsal, its margin deeply 



