22 DEEP-SEA FISHES OF THE ATLANTIC BASIN. 



Selackus maximns, Stoker, Hist. Fish. Mass., 1867, 253, xxxvn, 3. 

 Cetorhinus Gunneri, Blaxville, 1. c, 



Cetorhinus Blainvillei, Capello, Joru. Acad. Sci. Lisboa, n, 233, fig. 1-7. 

 Selache roatrata, Pavesi (young specimen). 



Body rugose, the skin very rough, with small spines; head small; snout blunt; eyes 

 small; teeth in six or seven rows in each jaw, about two hundred in each row; first dorsal 

 large, triangular, over the space between pectorals and veutrals ; second dorsal much smaller, 

 rather larger than anal ; tail large. 



This giant selachian appears to be most abundant in the far north. It is not unusual 

 about the British Isles, especially around Scotland and the Orkneys. Its capture is very 

 unusual in the Mediterranean, but in Norway it is the occasion of a considerable fishery 

 on account of its liver. In the northwestern Atlantic it is rare, though sometimes encoun- 

 tered by the Gloucester fishermen, where they capture it for its liver, as is done in Norway. 

 Prof. Verrill has recorded the occurrence in the summer of 1S70, at Eastport, Me., of there 

 specimens 25 to •'!<> feet in Length, and one previously taken in 1S6S, which measured 35 

 feet. Mitchill, writing in L814, spoke of its occasional occurrence at Provincetown. Storer 

 mentions a specimen measuring •"><• feet 3 -inches, harpooned in Provincetown Harbor in 1839. 



It is unknown elsewhere than in the North Atlantic, and south of the Grand Banks on 

 the west and Scotland on the east may be regarded as an estray. To what extent it fre- 

 quents the depths is unknown, but since the young have never been seen it is believed to 

 breed in deep water. 



Family CHLAMYDOSELACHID^, Garman. 

 Chlamydoselachidas, Garmax, Boll. Essex Institute, xvi, 1884,8 



Body much elongate, increasing in size very little anteriorly; head depressed, broad; 

 eyes lateral, without nictitating membrane; nasal cavity in skull separate from that ot 

 mouth; mouth anterior; snout broad, projecting very little; cusps of teeth resembling 

 teeth of serpents; spiracles small, behind the head : one dorsal, without spine; caudal without 

 pit at its root; opercular flap covering hist branchial aperture free across the isthmus; 

 intestine with spiral valve. 



CHLAMYDOSELACHLTS, Garman. 



Chlamydoselaehue, Garman. loo. oit. 

 Chlamydoselaehe, (Ji xther, Challenger Report. 



Branchial apertures six; opercular Hap broad, free across the isthmus; teeth similar in 

 both jaws, with slender subcorneal cusps and broad backward produced bases; no teeth in 

 the middle in front above, a row on the symphysis below; mouth wide, anterior; no labial 

 fold; no nictitating membrane; tins broad, pectorals far in advance of the others; caudal 

 without a notch posteriorly; gill arches slender, long; basihyal not wide; intestine small. 



CHLAMYDOSELACHUS ANGUINEUS, Garman. (Figure 22.) 



Chlamydoselachus anguineus, Garmax, Bull. Essex Inst., xvi, 1884, 3 (wood cut). — Bull. Mus. Comp. Zool., 



vol. xu, No. 1, 1885, plates. 

 Chlamydoselaehe anguinea, GOnther, Challenger Report, xxn, 2, pl>. lxiv-lxv. 



Body very long, slender, eel-like, increasing in size comparatively little anteriorly, com- 

 pressed near and behind the vent, which is in the posterior half of the total length. Head 

 broad, wider than high. Crown slightly convex, forming a rather sharp angle with the 

 snout and sides of the head from the eyes forward. Skull with an anterior foramen, begin- 

 ning a short distance in front of a vertical from the front edge of the orbit, resembling that 

 of Raja. Behind this, midway between the eyes, there is an elongate depression on the 

 crown as of a second foramen, while on the occiput, a little distance in front of the occipital 

 pores, a deep, rounded depression indicates what is commonly called the second, the poste- 

 rior foramen. Snout broad, rounded, hardly extending in front of the jaws, rather acute. 



