IIEPTRAXCHIAS ; ÜY SAMUEL GAIIMAX. 57 



thebase whicli is fbllowed by a long sharp oiie and tbis in 

 turn byone or two smaller ones. Behind tbe sevcn, 

 toward tbe angle ot' tbe jaws, tliere are a number of vcry 

 small ones. On tbe lower jaws tbe teetb are mncb broader, 

 tliat on tbe sj'mpln^sis is sniall and bcars most of its notcbes 

 on tbe leftside ; on eacb side of it tbere is a series of six, 

 eacb of wbicb bas one to two sniall, followedby fonr mod- 

 erate sized, cusps, tbe anterior of tbe fonr being little 

 if any longer tban tbe otber tbree ; and, in cases, tbere is 

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

 in tbe upper series tbere are very small teetb in tbe binder 

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

 front of tbe pectoral, tbe series separated on tbe tbroat by 

 a Space nearly as wide as tbat between tbem back of tbe 

 bead ; tbe widtb of tbe openings, and of tbe Spaces between 

 tbem decreases toward tbe pectoral. Pectorals nearly as 

 broad as long, angles rounded, posterior margin sligbtly 

 indented. Widtb across botb ventrals less tban tbeir 

 lengtb. The posterior inner portion of eacb ventral is a 

 strong fold, opening toward tbe bod}', and in it is bidden 

 tbe clasper. Dorsal ratber small, beginning above tbe pos- 

 terior extremity of tbe ventral and extending a little beyond 

 ii vertical from tbe middle of tbe anal, posterior margin in- 

 dented, lower angle produced, blunt. Anal smaller tban 

 tbe dorsal, beginning ander tbe middle of tbe lengtb of 

 tbe latter. Tail long witbout a pit at tbe root, armed on 

 tbe Upper edge by tbree series ofenlarged (tbickened and 

 broadened) scales. Caudal ratber narrow, widest ante- 

 riorly. Scales carinate, wbere tbey have not been rubbed, 

 with a long sbarp central point and, on eacb side of tbis, 

 one or two small ones. 



Brownisb, more or less faintly blotcbed witb dark'er on 

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

 bridge, Mass. 



