No. 1. — Chlamydoselaclius anguineus Garm. — A living Species 



of Cladodont Shark. 



By S. Garman. 



Description. 



Measurements. — Total length 59.5 inches. Snout to angle of mouth 4.5, to 

 back of skull 4.25, to occipital pores 3.9, to end of gill-covers 7, to base of pecto- 

 rals 8.5, to end of pectoral 14.25, to vent 35.5, to base of ventrals 32, to end of 

 ventrals 38.6, to base of anal 39.75, to end of anal 47.6, to base of dorsal 42.25, to 

 end of dorsal 47.75, to base of caudal 48.5 ; distance from bases of pectorals to bases 

 of ventrals 23 ; greatest width (across ventrals) 7, width across caudal 5, width 

 across dorsal and anal 6.5, width of head across eyes 3.5, width of the largest tooth 

 between the ends of the outer prongs 0.25, length of the longest cusp 0.17 ; and 

 greatest circumference 11.5 inches. 



Rows of teeth, ^^f • i^ • if • 



Rays on first branchial arch (hyomandibular and ceratohyal) 22, on second 15, 

 third 14, fourth 12, fifth 9, sixth 6, and seventh none. 



Hab. — Japan. 



The length of the specimen described is not far from fifteen times its 

 diameter, or a little more than five times its greatest circumference. 

 An elongate body, a long subtriangular and flattened head, an ante- 

 rior month, a most extensive gape, jaws bristling with sharp subconi- 

 cal hooked teeth, and a sinister look about the eyes, give it a remote 

 resemblance to certain ophidia ; and the narrow isthmus between the 

 gills crossed by the free mantle or flap of the first gill-cover is strongly 

 suggestive of certain fishes. The resemblances to snakes and fishes are 

 only remote ; the shagreen, the fins, the teeth, the gill-openings, the 

 cartilaginous skeleton, etc., show the animal at once to be a Selachian, 

 one of the Sharks. 



The single small dorsal, and the large ventrals, anal, and caudal, have 

 the appearance of being bunched together ; they are placed so far back 

 as to leave a space of almost two feet of the length entirely unrelieved 

 by fins, which contributes considerably toward an eel-like appearance. 



The skull is short, and, jaws and suspensorium (hyomandibular) being 

 very long and loosely articulated, the hinder portion of the head spreads 

 easily till its width equals its length, and the outline from above resem- 

 bles an equilateral triangle, or, better, an arrow-head with barbs. 



VOL. XII — NO. 1. 1 



