354 PEOCEEDIXGS OF UNITED STATES NATIONAL MUSEUM. 



at tip. The other teeth are very similar to each other, six iu number on 

 each side and shghtly increasing in size from the middh^.. They are 

 much broader than high, and armed with about four sharp points turned 

 outward, besides one or two smaller ones. The first point is longest, 

 and has a small cusp on its side, so that strictly one might call the 

 second cusp longest. 



Gill-openings 7, high ; pectorals moderate, truncate and slightly con- 

 cave behind ; ventrals moderate, rather backward; anal small, the single 

 small dorsal just in front of it, covering most of the interspace between 

 it and the ventrals. 



Tail very long, forming a little more than one-third the length (2f ). 

 A notch near its tip below; the lower lobe a little developed. Upper 

 edge of tail with about three series of scales, much enlarged, so that its 

 entire edge is finely serrated. 



])escribed from two specimens from Soquel, each 18 inches long, one 

 male, the other female. 



Description of the jaws of Heptrancliias maculatus, adult, from Humboldt 



Bay. 



No median tooth in upper jaw. Upper jaw with two transverse 

 series of teeth on each side of symphysis, the outer series usually with 

 two, the inner with four or five teeth, some of which are placed 

 externally to the main row. They are lanceolate from a quadrate 

 base, the points directed backwards and curved slightly outwards, 

 without CUSI3S or serrations. First tooth of main series similar to sym- 

 physeal teeth, but larger and broader, with a larger or smaller cusp at 

 base on outer side and with or without minute serrations on base of 

 inner side ; from this towards corner of mouth there is much variation 

 in the development of cusps and serratures, the teeth, however, con- 

 stantly approximating in shape those of the lower jaw, always differing 

 in being smaller, with external margins more inclined, and with the 

 central cusp larger in comparison to others and more distant from 

 them. Sometimes on each side are four or five teeth, bicuspidate and 

 without serrations on inner edge ; in other jaws the second or third 

 tooth from symphysis has three or more cusps on the outer margin, and 

 with serrulations or a single cusp at base on inner side. The last large 

 tooth on each side usually broad and low, with the two margins sub- 

 equal, without prominent median cusp; the inner margin minutely 

 serrate ; the outer with seven or eight cusps. 



In lower jaw the teeth are much larger than in upper, and are uniform 

 in shape and style of armature; they are wide from a quadrate base, the 

 outer margins comparatively little inclined and with the cusps regularly 

 and rapidly graduated, usually seven in number ; the inner margins 

 short, gibbous and much curved, always distinctly serrate; median tooth 

 upright, without median cusp, and with threeor fourcuspson each margin. 



Each jaw has laterally about 12 transverse series of small linear teeth, 



