22 DEEP-SEA FISHES OF THE ATLANTIC BASIN. 



Selachus maximus, Stouick, Hist. Fish. Miiss., 1807, 2.53, .xxxvii, 3. 

 Cetorhiiius Cunneri, Jii.ANViLi.i:, 1. o. 



Ceiorhinus Itlaiiivillei, Capklu), ,Ioru. Acad. Sei. Lishoa, u, 233, tig. 1-7. 

 Sclachv roxtraUi, Pavksi (youii}; spotiiiuai). 



Body nisose, tlie skin very roagli, with smull 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, triiingnlar, over the space between pectorals and ventrals; secnud dorsal much smaller, 

 rather larger than anal; tail large. 



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

 about the British Isles, especially around Scotland and the Oikneys. Its captuic 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 1<S7(), at Eastport, Me., of there 

 specimens 25 to 30 feet in length, and one previously taken in 1868, which measured 35 

 feet. Mitchill, writing in 1811, spoke of its occ isional occurrence at Provincetown. Storer 

 mentions a specimen measuring 30 feet 3 inches, harpooned in Proviucetovi^n Harbor in 1839. 



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

 the west and Si-otland 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 CHLAMYDOSELACHIDvE, Garman. 



Chlamydosclachidce, Gahmax, Bull. Essex Institute, xvi, 1884, 8 



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

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

 month; 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 first branchial aperture free across the isthmus; 

 intestine with spiral valve. 



CHLAMYDOSELACHQS, Garman. 



Chlamydostlufhus, G.\rman', loc. cit. 

 Chlami/doKclaclic, Gunther, Challenger Rci)ort. 



Branchial ai>ertures six; ojwrcular flap broad, fi'ee across the isthmus; teeth similar in 

 both jaws, with slender subconical cusps and broad backward produced bases; 7io teeth in 

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

 fold; no nictitating membrane; fins broad, ])ectorals far in advance of the others; <-andal 

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



CHLAMYDOSELACHUS ANGUINEUS, Gahman. (Figure 22.) 



Chlamjidosclachus anguineus, Garman, Hull. Essex Inst., xvi, 1884, 3 (wood cut). — Bull. Mus. Comp. Zoijl., 



vol. XII, No. 1, 1885, plates. 

 Chlamydoaelache anguinea, GOniukh, Clialleugor Report, xxiT, 2, pl.s. Ixiv-lxv. 



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

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

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

 snout and sides oi' the head from tlie eyes forward. Skull with iin 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 oc(;iput, a little distance in front of the occipital 

 pores, a deep, rounded de])ression indicates what is commonly called the second, the poste- 

 rior foriimen. Snout broad, rounded, hardly cxteinling in front of the jaws, rather acaite 



