596 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvi. 



was taken at Misaki b}' Kuuiakichi Aoki, with hook and line, in deep 

 water. 



The .species is not rare on the eoast of southern Japan. 



(Named for Bashford Dean.) 



FamUy II. CHLAMYDOSELACHID^E. 



FRILLED SHARKS. 



Bod}-^ ver}' elongate and slender, the tail tapering to a point. Head 

 very broad and depressed. Snout broad. Eyes lateral and without 

 nictitating membrane. Nostrils large, the nasal cavity separate from 

 the mouth. Mouth anterior, the jaws almost equal. Teeth in oblique 

 rows, the bases extended backward, arid the cusj^s slender. Spiracles 

 present. Gill-openings six. Dorsal fin posterior, without spine; anal 

 fin well developed. No pit at root of caudal. First gill-inembrane 

 not free across the isthmus, but joined by median and rather thick 

 membrane. Intestine said to have a spiral valve. Anterior basi- 

 branchial cartilages present. 



2. CHLAMYDOSELACHUS Garman. 



ChlamydoselachuK Garman, Bull. Essex Inst., Jan. 17, 1884. p. 47 {anguineus). 

 Chlamydofielac]i(' Gunther (variant in spelling). 



Opercular flap forming a l)road frill over first gill-opening. Ej^es 

 rather small; mouth very large, extending far beyond the eye. Teeth 

 similar in the jaws, each with three slender, curved, sulx'onical cusps, 

 separated by a pair of rudimentary denticles, on a Inroad base; no 

 median series of teeth above like that on the symphysis of the mandi- 

 ble. Mouth larger than broad, and with no labial folds at angles. 

 Pupil horizontally elongated. Fins lu'oad, roiuided; caudal without a 

 notch. 



Of this genus but a single living species is known. It inhabits the 

 open sea in waters of some depth, and is most abundant in the Kuro 

 Shiwo or warm current on the east coast of Japan. 



{X^ajuvg, mantle or frill; ffsXaxog, shark.) 



2. CHLAMYDOSELACHUS ANGUINEUS Garman. 



RABIJKA; KAGURAZAME (S(JAFFOLD SHARK). 



ChlaviydoHelachus anguineuH Garman, Bull. Essex Inst., Jan. 17, 1884, p. 47, with 

 figs.; Japanese seas; Bull. Mus. Comp. Zool., 1885, XII, N(i. 1, with plates 

 and account of anatomy; off Japan. — Gunther, Deep Sea Fishes Challenger, 

 1884, p. 2, with plates; Japan.— Collett, Bull. Soc. Zool. France, 1890, 

 p. 219; Funchal, Madeira. — Jordan and Evermann, Fish N. M. America, I, 

 1896, p. 15 (after Garman). 



Head about 7i in length; depth about 12|; tail 1^ in trunk and head; 

 eye 8 J in head; snout 4; maxillary 1|; interorbital space 2f\ width of 



