8. TEI^NODON. 383 



ing a regular semicircle ; the posterior margins of the sides of the 

 hammer ?ery short. Nostril close to the eye, with the groove in- 

 distinct. 



Atlantic ; China. 



rt. Young. New Orleans, Purchased of Mr. Cuming. 



6. Young. Belize. From Mr. Godman's Collection. 



c. Young. Atlantic. 



d. Young. Bahia From Dr. Wucherer's Collection. 



e. Young. China Presented by Sir J. Richardson. 



5. Zygaena mokarran. 



Zygsena mokarran, Hiipp. N. W. Fisch. p. G6, taf. 17. fig. 3. 

 Sphyrna mokaiTan, Miill. ^ Ilenle, p. 54. 



Anterior margin of the head nearly straight, forming a right angle 

 with the lateral. Length of the hind margin of one of the lobes of 

 the hammer equal to its width near the eye. No incision above the 

 nostril, which is close to the eye. No groove proceeding from the 

 nostril along the front margin of the head. (Eiipj).) 



Red Sea. 



Group C. MUSTELINA. 



8. TRLffiNODON. 

 Triaenodon, sp., Miill, 4" Henle, p. 65. 

 The first dorsal fin opposite to the space between the pectorals and 

 ventrals, without spine. A pit at the commencement of the caudal. 

 Lower caudal lobe distinct. Membrana nicticans present ; spiracles 

 none. Mouth crescent-shaped ; a pit behind the angle of the mouth. 

 Teeth small, numerous, equal in both jaws, each with a longer median 

 cusp, and one or two femall ones on each side. 

 Red Sea ; Indian Ocean. 



1. Trisenodon obesus. 



Carcharias obesus, Riipp. N. W. Ft'sch. p. 64, pi. 18. fig. 2. 

 Triajnodon obesus, Miill. Sr Henle, p. 55, pi. 20 ; Dumpril. Elasmohr. 

 p. 386. 



Snout very short and obtuse. Front margin of the nostril with a 

 short tentacle. The second dorsal is more than half the size of the 

 first, opposite to and rather larger than the anal. First dorsal very 

 close to the root of the ventral. Top of the dorsal and caudal fins 

 white. 



Red Sea ; Indian Ocean ; New Hebrides. 



a. Young. Seychelles. Presented by Lieut-Col. Playfair. 



h. Head and tail of adult. Seychelles. Presented by Lieut.-Col. 



Playfair. 

 c. Fine specimen : stuffed. Aneiteum. Collected by Mr. M'Gillivray. 



