SYNOPSIS. 415 



blue, lower part of the sides, pectoral fins, belly, and 

 ventral fins, white. — Cuv. Reg. Aii.; Tarr. Brit. Fish,^ ii. 

 498. Squalus glaucus, Liwn., Penri. Brit. Zool. iii. p. 143. 

 Sp. 221. C. vulgaris. White Shark. Head large, mouth 

 very wide, upper jaw with six rows of teeth which are 

 ".nearly straight on the edges and serrated, under jaw with 

 four rows, sharper, narrower, and less compressed than 

 those above ; pectoral and first dorsal fins very large, ven- 

 trals small ; colour ash-brown above, white beneath . — 

 Cuv. Reg. An., Yarr. Brit. Fish.^ ii, 502. Squalus car- 

 charias, Linn., Penn. Brit. Zool., iii. p. 139. 

 Gen. CVII. Zyg^na. Head depressed, truncated anteriorly, 

 and the sides extended horizontally so as to appear hammer- 

 shaped, the eyes placed at the extremities of these lateral pro- 

 longations ; two dorsals ; branchial openings five. 



Sp. 222. Z. malleus. Hammer-headed Shark. Teeth in 

 both jaws, the edges smooth in young fish, serrated in 

 adults ; pectoral fins nearly triangular ; first dorsal large, 

 upper lobe of the tail long and thick; skin slightly granu- 

 lated, colour greyish brown above, nearly white beneath. 

 Valen., Tarr. Brit. Fish., ii. 504. Squalus Zygsena, Linn. 

 Squale marteau, Lacepede. 

 Gen. CVIII. Galeus. Dorsals two, the first commencing 

 on a line close behind the pectorals ; snout flat and rather long ; 

 temporal orifices present ; teeth pointed and serrated, on the 

 outer edge of both jaws. 



Sp. 223. G. vulgaris. Common Tope. Body long and fusi- 

 form ; eyes about half-way between the extremity of the 

 snout and the first branchial opening ; second dorsal half- 

 way between the first and the extremity of the tail ; anal 

 present ; upper lobe of the caudal large and truncated at 

 the extremity ; colour deep slate-grey above, yellowish 

 white beneath. — Cuv. Reg. An.; Flem. Brit. An,, p. 165 ; 

 Squalus galeus, Linn., Penn. Brit. Zool., iii. p. 146, pi. 18. 

 Gen. CIX. Mustelus. Teeth small and obtuse, forming a 

 closely compacted pavement in each jaw; in other respects 

 neaily as in Galeus. 



