720 PLAGIOSTOMATA— SELACHOIDEI. 



SpJiyrna eygoena, Miiller and Henle, Plagios. p. 51 ; Eichards. Ich. China, p. 194 ; Bleeker, Beng. p. 80 ; 

 Cantor, Catal. Mai. Fish. p. 401. , „ ,^ _, . . „ 



Cestmcion zygvena, Gill, Ann. Lye. Nat. Hist. New York, vii, p. 403 ; Dnmeril, Hist. JNat. Poiss. i, p. 382 ; 

 Day, Fish. Malabar, p. 270. 



Gestracion Leewwenii, Dnmeril, 1. c. p. 383. 



The hind edge of the lateral expansion of the head nearly equals its width near the eye, and has a 

 groove along almost its entire anterior edge. Nostrils close to the eye. OoZows— body and fins slaty-gray : 

 under surface white. 



Habitat. — Tropical and temperate seas. 



3. Zagsena tudes, Plate CLXXXVIIl, fig. 4. 



Squale pantouflier, Lacepfede, i, p. 261, t. vii, f. 3. 

 Squalus zygoma, Russell, Pish. Vizag. i, p. 8, and Koma sorra, pi. xii. 



Zygcena tudes, Cut. Regno Anim. ; Val. Mem. Mus. ix, p. 225, pi. ii, f. 1 ; Giinther, Catal. viii, p. 382. 

 Sphyrna tades, Miill. and Henle, Plagiost. p. 53 ; Miill. and Trosch. in Schomburgh, Brit. Guian. iii, 

 p. 642. 



Gestracion tudes, Dumeril, Hist. Nat. Poiss. i, p. 384. 



Anterior edge of head curved, but the front margin is not continuous with the lateral one : the length of 

 its hind margin less than its width near the eye. Eyes — situated just below the junction of the anterior and 

 outer edges of the snout. Nostril close to the eye, and a groove running along the anterior edge of the head. 

 Teeth — oblique, with a notched outer edge, ii'ms— dorsal arises above the hind margin of the inner edge 

 of the pectoral fin, its height equals the length of the pectoral : second dorsal over the hind half of the anal : 

 length of the base of the anal extends 2/3 of the distance to the ventral : caudal 3 to 3J in the total length. 

 Golours — Gray, becoming lighter beneath : first dorsal fin very dark, the upper portion of the second dorsal 

 and the lower caudal lobe deep black in newly captured examples, the colour fading after they have been some 

 time in spirit. One example, captured at Cochin, Dec. 27th, 1872, besides the black marks on the fins 

 mentioned, had the hind edge of the dorsal and the end of the pectorals dark. 



Halitat. — Mediterranean, Indian Ocean and Archipelago, also tropical parts of the Atlantic. It attains 

 several feet in length. 



Third group — Mustelina. 



Teeth small, having a central, and one or two smaller lateral cusps .- or the teeth may be obtuse. 



Genus, 6 — Teijjnodon, Miilter and Senle. 



No spiracles. Membrana nietitans present. Mouth crescentic, with a pit behind its a/ngle. Teeth numerous m 

 both jaws and consisting of one central cusp and a smaller lateral one on either side. First dorsal spineless placed 

 opposite the interspace between the pectoral and ventral fins. Lower caudal lobe distinct. A pit at the root of the 

 caudal fin. 



Triaenodon obtusus, Plate CLXXXIX, fig. 3. 



Snout short and rounded, the distance between the mouth and the end of the snout equals about 1/2 the 

 width of the mouth. Nostrils nearer end of snout than the mouth, each with a flap. Eye of moderate size. 

 Gill-openings rather wider than the orbit. No spiracle. Teeth — with one central and a small lateral cusp on 

 either side. Fins — the first dorsal commences behind the inner angle of the pectoral and its base does not 

 extend to above the ventral. Second dorsal not quite 1/2 as large as the first and situated above the anal. 

 Pectoral reaches to below the middle of the first dorsal : caudal fin nearly 1/4 of the total length. Golours — 

 dark above, becoming lighter beneath. 



This species is allied to T. obesus, Riippell, but its first dorsal fin is more advanced, and its second dorsal 

 considerably smaller than shown in Riippell's figure or the examples in the British Museum. 



Habitat. — One example, nineteen inches in length, was obtained at Kurrachee : it is a young male. 



Genus, 6 — Mustilus, Cu/vier. 



Membrana nietitans present. Small spiracles behind the eyes. Mmth crescentic, with long labial folds. 

 Teeth small, numerous, similar in both jaws, pavement like, obtuse or with indistinct cusps. The first dorsal fm 

 spineless, situated above the interspace between the pectoral and ventral : the second nearly as la/rge as the first : 

 caudal without a distinct lower lobe, and no pit at the commencement of the fin. 



Geographical distribution. — Seas of tropical and temperate regions. Not recorded from the Red Sea. 



Mustelus manazo, Plate CLXXXVI, fig. 3. 



Mustelus vulgaris, Temm. and Schleg. Pauna Japon, Poiss. p. 303, t. cxxxiv. 

 Mustelus manazo, Bleeker, Japan, p. 126 ; Gunther, Catal. viii, p. 387. 

 Pa sorrah, Tel. 



