35 



of the blower flattened and concave beliind, with a slightly 

 raised, lozenge-sliaped space in the front half. 



Inhab. North Sea, Gulph of Christiania. 



FcEtal specimen and skeleton, Brit. Mus. 



The skull of the skeleton in the British Museum is at 

 once known from the skull of the L. (ilbirostris, at Nor- 

 wich, by being smaller, and the nose rather narrower, and 

 espcciall}' by the hinder part of the intermaxillaries, which 

 form the triangle in front of the blower, being flattened 

 and concave instead of swollen and convex. 



Skull, length entire ... Ifi'O inches & lines. 



„ of nose .... 8'G 



„ of lower jaw 13'0 



Breadth at notch .... 8'3 



,, notch .... .... 4'0 



„ middle of beak 2"9 



** Beak moderate ; nose of skull only as lovg as head ; 

 teeth not quite to the notch. 



White-beaked Bottle-nose. Lagenorhynchus 

 albirostris. 



Tab. 10. Animal, 11. Skull. 



Delphinus Tursio, Brighlwell, Ann. Nat. Hist. 1846,21, 

 /. 1, 2. 



Delphinus albirostris. Gray, Ann. Si' Mag. N. H. IBiC. 



Upper part and sides very rich, deep-velvet, black, ex- 

 ternal cuticle soft and silky, so thin and delicate as to be 

 easily rubbed off"; nose, a well defined line above upper 

 jaw, the whole under jaw and belly cream-colour, varied 

 with chalky white ; fins and tail black ; teeth -|| small, 

 curved ; jaws moderately elongate, lower rather the 

 longest ; blowhole horse-shoe-shaped and convex to- 

 wards the head ; nose of skull as long as the head cavity, 

 gradually and evenly tapering to a rather rounded point 

 in front, the edge rather reflexed on each side behind ; 

 the triangle in front of the blower convex and swollen on 

 each side behind, smooth in front. 



Inhab. North Sea, coast of Norfolk. 



Mus. Norwich. — Skeleton. 



Through the kindness of Mr. Brightwell, I have been en- 

 abled to examine the skull of this species, and to copy the 

 beautiful drawing of the animal made by his daughter. 

 Animal, length entire 



„ of mouth .... 9'6 inches & lines. 



„ of nose to eye 13"0 



„ to pectorals .... 20'0 



„ of pectoral .... 15"0 



„ lo dorsal .... 41 '0 



„ of dorsal .... 11.6 



Height of dorsal .... lO-Q 



Width of tail .... 220 



Skull, length entire .... 18"0 



„ of nose .... 8.6 



Width at orbit .... 9-5 



„ at notches 5'6 



„ of middle of beak3"6 



„ of lower jaw at 



condyles 8'0 



The fcGtus of this species has six bristles on each of the 

 upper lips, the hinder one being rather farther from the 

 rest than the others are apart, which are equally placed, 

 and of the same size. The tongue (tab. 20, /'. 3 ), is flat on 

 the top and as wide as the space between the sides of the 

 jaws, with a regular sharp denticulated edge on each side, 

 and with a rather larger, conical, separate tubercle in front. 

 The teeth are not developed through the gums. The nose 

 is nearly \ the length of the distance between the end of 

 the nose and the eye. The hinder part of the back has a 

 rather thick convexity, like a long low rounded, second 

 dorsal fin just before the tail ; the same part of the fojtus of 

 Delphinus (/)e //;//«« ?), and Steno? fuscus has the part 

 very much compressed, and fined off to a very thin, knife- 

 like edge. 



** Nose of skull longer than the length of the brain- 

 cavity ; teeth-line some distance from the notch. 



The Electra. Lagenorhynchus Electra. 



Tab. 13. Skull. 



Skull rather depressed ; nose flattened above, expand- 

 ed and reflexed on the side behind, rather shelving in 

 front ; sides rather contracted in the middle, rather long- 

 er than the head and If the length of the width at the 

 notch ; intermaxillary broad, flattened, nearly § of the 

 width, with a large, wide groove for the greater part of its 

 length ; triangle flat, rather concave behind, with a lo- 

 zenge-shaped, rather raised, rugose space in the front half; 

 teeth -II-, rather small, cylindrical, conical, slightly curved, 

 acute, four in an inch ; the lower jaw regularly converg- 

 ing, straight on the sides in front, rather swollen behind, 

 and shortly obliquely truncated in front, the gonyx rather 

 produced. 



Inhab. : Skull, British Museum. 



This skull is very like the former, but it is considerably 

 larger, and the nose is longer in proportion, and the head 

 is much more depressed in the middle and spread out on 

 the sides. 



Skull, length entire .... 17"6 inches & lines. 



„ of head .... 8-3 



,, of nose 



9-9 



7-0 



14-6 



10-3 



5-7 



at middle of beak 4'0 

 of intermaxillary 2"6 



„ of teeth line .... 

 „ of lower jaw 

 Width of temple 

 „ at notch 



The Asia. Lagenorhynchus Asia. 

 Tab. 14. Skull. 

 Skull nose rather depressed, broad, flattened, rather con- 

 tracted in the middle of each side ; triangle concave, with 

 a .slightly raised, flat, rugose space in the front half; teeth 

 4-|., small. 



Inhab. : Skull, British Museum. 



This species is only known from a skull without teeth. 

 It very much resembles in the depressed and expanded 



