HEPTRANCHIAS ; BY SAMUEL GARMAX. 57 



the base whic*h is followed by a long sharp one and this iu 

 turn by one or two smaller ones. Behind the seven, 

 toward the angle of the jaws, there are a number of very 

 small ones. On the lower jaws the teeth are much broader, 

 that on the symphysis is small and bears most of its notches 

 on the leftside ; on each side of it there is a series of six, 

 each of which has one to two small, followed by four mod- 

 erate sized, cusps, the anterior of the four being little 

 if any longer than the other three ; and, in cases, there is 

 also a small cusp on the posterior portion of the base. As 

 in the upper series there are very small teeth in the hinder 

 portion of the series. Gill openings seven, wide, all in 

 front of the pectoral, the series separated on the throat by 

 a space nearly as wide as that between them back of the 

 head ; the width of the openings, and of the spaces between 

 them decreases toward the pectoral. Pectorals nearly as 

 broad as long, angles rounded, posterior margin slightly 

 indented. Width across both ventrals less than their 

 length. The posterior inner portion of each ventral is a 

 strong fold, opening toward the body, and in it is hidden 

 the clasper. Dorsal rather small, beginning above the pos- 

 terior extremity of the ventral and extending a little beyond 

 a vertical from the middle of the anal, posterior margin in- 

 dented, lower angle produced, blunt. Anal smaller than 

 the dorsal, beginning under the middle of the length of 

 the latter. Tail long without a pit at the root, armed on 

 the upper edge by three series of enlarged (thickened and 

 broadened) scales. Caudal rather narrow, widest ante- 

 riorly. Scales carinate, where they have not been rubbed, 

 with a long sharp central point and, on each side of this, 

 one or two small ones. 



Brownish, more or less faintly blotched with darker on 

 back and flanks. Type in Mus. Comp. Zool., Cam- 

 bridge, Mass. 



