208 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 



Dorsal spines hardly projecting beyond the skin. Scales pedunculate, plurica- 

 rinate on head, shoulders, and belly. Teeth |§ ; upper lanceolate, more than twice 

 as numerous as lower, in two groups at each side, cusps shaped like a spear-head, 

 subtriangular in transsection, several rows in function ; lower broad, compressed, 

 cusps with a deep notch at the outer edge, apex raised, cutting edge rising obhquely 

 toward the angles of the mouth, one row in function; no median tooth at the lower 

 symphysis. Labial folds hidden in the deep, straight, oblique folds crossing the 

 angles of the mouth ; lower short, upper much longer and reaching half-way to the 

 middle of the mouth, that is, a little farther than the groove. Nostrils widely sepa- 

 rated, nearer to end of snout than to mouth. Spiracles medium, superior, one 

 diameter backward and two diameters distant from the orbit, with a large antespi- 

 racular chamber, extending forward from the valve to a point above the posterior 

 angle of the orbit, valve with folds on its inner side like gill lamellae. The lining 

 of the prespiracular chamber is without shagreen and apparently is sensitive. 

 Posterior margin of pectoral oblique, inner angle much shorter ; base of second 

 dorsal longer and fin higher than in first dorsal, hinder angle produced, base equal 

 one fifth of its distance from the first dorsal base ; end of pectoral not reaching to 

 a vertical from the first dorsal spine ; end of ventral base reaching a vertical from 

 the spine of the second dorsal. 



Uniform dark brown. 



No. 1037, Mns. Comp. Zool. Total length, 31i inches. 

 Hab. Yenoura, Suruga Gulf, and Sagami Bay, Japan. 

 Named in honor of Alan Owston, Esq. 



Pristis clavata, sp. nov. 



The group of species of this genus contaiuing P. peefmatus Lath., 

 1794, and P. zysron Blkr., 1852, is that iu which the present form most 

 naturally falls. 



Rostral teeth in twenty-one pairs, not trenchant behind. Origin of the first 

 dorsal one fourth of the length of its base farther backward than the origin of the 

 ventral. Pectoral origin in advance of tlie first gill cleft nearly the width of the 

 internarial space, or the length of the orbit; outer angle of pectoral fin blunt and 

 bluntly rounded. Second dorsal smaller than first dorsal, length equal about three 

 fifths of the length of the caudal fin, or one sixth shorter than first dorsal. Caudal 

 fin obliquely truncated without an anterior lobe on the subcaudal portion. Tttal 

 length, 24| inches. 



No. 733, Mus. Comp. Zool. 



Hab. "Queensland, Australia." 



Distinguished from Pristis pectinatus by the smaller number of rostral teeth 

 and the position of the first dorsal backward of the origins of the ventrals ; 

 from P. zysroH by the smaller number of teeth in the saw, the more forward 

 origin of the first dorsal, and the second dorsal smaller than the first donsal; 

 and from P. zcphyreus J. & S., 1895, by the backward origin of the first dorsal, 

 the lobeless caudal fin, and the spacing of the rostral teeth. 



