22. OTNGLYMOSXOMA. 407 



Squalus anuulatus, Nilss. Prodr. p. 114. 



Scylliorhiuus delarochianus, Blainv. Faun. Fratif. p. 74. 



melastomua, {Rufinesquc) Blainv. 1. c. p. 75. 



I'ristiurus melannstomus, Bomip. Fdiin. Hal. Pesce ; Midler ^- Hcnlv, 



p. 15, pi. 7 ; Ydrrell, Brit. Fish. 2ud edit. ii. p. 375, or Srd edit. ii. 



p. 479; Duineril, Flanniobr. p. 325. 

 ycylliiun aiimilatiiui, Niks. Skand. Faun. p. 713. 

 melastoiiium, Jew/ns, Man. p. 497 ; Kroxj. Damn. Fisk. iii. 



p. 832. 

 Pristiuru.s artedi, Bocaije 8f Capello, Peix. Plnr/iosi. p. 11. 

 Black-mouthed dog-lisli, Conch, Fish. Brit. Isl. i. p. 18, pi. 3. 



Nasal valves separated by a broad interspace, nearer to the mouth 

 than to the end of the snout ; a short labial fold round the angle of 

 the mouth. Dorsal tins subequal in size, the second above the hinder 

 part of the anal ; anal fin nearly as long as the head to the first gill- 

 opening. Upper parts with rounded darker spots of various sizes, 

 each with a lighter margin. 



European seas. 



a. Adult (28 inches). North coast of Norway. Purchased of Hr, 

 Brandt. 



b-c. xVdult : skins. Great Britain. From Yarrcll's Collection. 



d. Adult, Lisbon. Presented by the llev. 11. T. Lowe. 



e-f. Adult and half-grown. Madeira. Presented bv the llev. K. 

 T. Lowe. 



(J, 7i, i. Adult and half-grown. Madeira. Presented by J. Y. John- 

 son, Esq. 



h. Half-grown. Nice. From Dr. Deakin's Collection. 



/, m-n. Half-grown. Mediterranean. Purchased. 



22. GINGLYMOSTOMA. 



Ginglymostoma, Miiller Cf Ilenle, p. 22. 

 Nebrius, Iiiij)j)ell, N. W. Fisch. p. 02. 



Two dorsal fins, without spines ; the first above or behind the 

 ventrals ; the second opposite to, and somewhat in advance of, the 

 anal. Eyes very small ; spiracle minute, behind the eye. Nasal and 

 buccal cavities confluent. The nasal valves of both sides form one 

 quadrangular flap in front of the mouth, each being provided ■udtli a 

 free cylindrical cirrus. An upper and lower lip, the latter not ex- 

 tending across the symphysis. The fourth and fifth gill-openings 

 close together. 



Two subgenera may be distinguished according to the denti- 

 tion : — 



a. Teeth of both ja .\s in many series, each with a strong median cusp, 

 and one or two naueh smaller cusps on each side : Ginglymostonia, 

 JNI. & II. — jVtlantic and Indian seas. 



fi. Teeth of both jaws in only a few (three) series, the foremost only being 

 in function. Each tooth has a con\ex, finely and equally serrated 

 margin : Nebrius, Itiipp. — Indian seas. 



