XOTIDANITt.lO. 397 



Fam. 4. xNOTIDANIDtE. 



Characters of the single genus, 



19. NOTIDANUS. 



Notidanus, Ciw. 



Ilexanchus et Ileptanchus, anct. 



Monopterliinus (part.), Blainv. 



One dorsal fin only, without spine, opposite to the anal. Ino pit 

 at the root of the caudal fin. No membrana nictitans. Spiracles 

 small, on the side of the neck. No labial fold. 3Iouth crescent- 

 shaped. Dentition unequal in the jaws : in the upper jaw one or two 

 pairs of awl-shaped teeth, the following six being broader and pro- 

 vided with several cusps, one of which is much the strongest. 

 Lower jaw with six large comb-like teeth on each side, beside the 

 smaller posterior teeth. Six or seven wide gill-openings. 



Temperate and tropical seas. 



a. GiU-npcninys six : Ilexanchus. 



1. Notidanus griseus. 



Piscis vaoca, Scilla, De corpor. niarin. lapidescent. tabb. 1, "27 ^ He 28. 



Griset, Brouss. Ac. Sc. 1780, p. 663 ; Lacep. i. p. 269. 



Squalus griseus, Chn. L. i. p. 1495; Bl. Schn. p. 129; Bisso, Ichth. 

 Nice, p. 37. ^ 



vacca, Bl. Schn. p. 138. 



Monopterhiinis griseus, Blainv, Faun. Fr. p. 77. 



Notidanus griseus, Cuv. B^yne An. ; Bonap. Faun. Ital. Peso. ; Couch 

 in Zoologist, 1846, p. 1337, and Fish. Brit. Isl. i. p. 21, pi. 4 ; Bo- 

 cage 4' Capello, Peix. Plagiost. p. 15. 



monge, Risso, Eur. M6rid. iii. p. 129. 



Ilexanchus griseus, Miill. 8f Henle, p. 80 ; Yarr. Brit. Fish. 3rd edit, 

 ii. p. 515 ; Du7n6ril, Elasmobr. p. 431, pi. 4. figs. 9-12 (teeth). 



Teeth : Agass. Poiss. Foss. iii. pp. 92, 216, tab. E. figs. 2-4. 



Snout obtuse, rounded, the nostrils being nearer to its extremity 

 than to the mouth. Dorsal and anal fins equal in size and shape ; 

 about one-half of the former is in advance of the anal. No single 

 median pointed tooth in the upper jaw. The first cusp of the lower 

 teeth not much Inrger than the following. 



Mediterranean and Atlantic. 



n. Female: stuffed, 12 feet long. Isle of Wight. Presented by 



Capt. Swinburn, R.N. 

 b. Male : stuffed, 7 feet long. Polperro. 

 '■. Yoiuip:. Nioo. From Dr. Deakin's Collection. 



