2. Tursio Metis (T. 18), Gray, I. c. 256. 

 E. # T. t. 18; P. Z. S. 18(36, p. 215. Hab 



3. Tursio Cymodoce (T. 19), Gray, I. c. 257. 

 Zoo!. E. $ T. t. 19; P. Z. S. 1866, p. 215. Hab. 



no. 3; Zool. 



no. 4; 



I. Electra, Gray, I. c. 267. 

 The beak of the skull very flat above, with the edges in 



front of the notches bent up. 

 siderably short of the notch. 



Teeth-line stopping cou- 



4. Tursio Eurynome (T. 17), Gray, I. c. 261. no. 8; 

 Zool. E. «Sf T. t. 17 ; P. Z. S. 1866, p. 215. Hab. South 

 Sea, India ?, Bay of Bengal. 



5. Tursio catalania, Gray, I. c. 262. no. 10; P. Z. S. 

 1866, p. 215. Hab. North-west coast of Australia. 



These skulls are all very much alike. 



VI. Eutropia, Gray, I. c. 262; P. Z. S. 1866, p. 215. 



Beak of the skull only rather longer than the brain-case. 

 Skull depressed, thick, with the sides rather bent down 

 behind the notch. The beak depressed, broad, rounded oil 

 the sides, rather longer than the length of the brain-case ; 

 the intermaxillaries flat, rather broad. Teeth small, slen- 

 der, five or six in an inch. 



The skull bears a considerable affinity to the skulls of 

 Phocana, Neomeris, Beluga, and Monodon in the bending 

 down of the sides. 



* Beak of the skull rather longer {about one-third) than the 

 length of the brain-case. Teeth moderate, four in an 

 inch, those in the lower jaw rather larger. 



1. Electra obtusa. Lagenorhynchus Electra (T. 13, 

 skull), Gray, I. c. 268; P. Z. S. 1866, p. 216; Zool. 

 E. §■ T. 1. 13. Beak tapering, rounded in front. Hab. ? 



2. Electra Asia (T. 1-1, skull). Lagenorhynchus Asia, 

 Gray, I. c. 269. no. 3; Zool. E. % T. t. 14. Beak attenu- 

 ated, acute in front. Hab. ? 



3. Electra fusiformis. Delphinus fusiformis, Owen, 

 Trans. Zool. Soc. vi. t. 5. f. 1, t. 7 (skull). Beak broad, 

 and rounded in front. Hab. India {IV. Elliot). B. M. 



4. Electra acuta. Lagenorhynchus acutus, Gray, I. c. 

 269. no. 4, according to Schlegel's figure of the skull, 

 should be arranged in this section. Hab. North Sea. 



1. Eutropia Dickiei (T.te),Gray,P.Z.S. 1866, p. 215. 

 Tursio Eutropia, Gray, P. Z. S. 1862, p. 145 ; /. c. 262. 

 no. 9. Hab. South Pacific Ocean, Chili. 



2. Eutropia Heavisidii, Gray, P. Z. S. 1866, p. 215. 

 Tursio Heavisidii, Gray, I. c. 263. Hab. From the Cape 

 Seas. 



The D. cephalorhynchus of P. Cuvier, judging from the 

 figure of the skull given by Sclilcgel, appears also to belong 

 to this genus. 



See Stigmatias (Amblvodon), Cope, Proc. Acad. N. S. 

 Philad. 1866, p. 294. 



** Beak of the skull rather shorter than the length of the 

 brain-cavity. Teeth small, five or six in an inch. 



5. Electra clancula (T. 35). Lagenorhynchus clau- 

 culus, Gray, I. c. 271, 272, 275. Beak af the skull broad 

 behind, once and three-fourths the width of the notch in 

 length. Teeth five in an inch. Hab. South Pacific Ocean. 



6. Electra thicolea (T. 36). Lagenorhynchus thicolea, 

 Gray, I. c. 271. no. 7. Beak of the skull narrow behind, 

 twice as long as the width at the notch. Teeth small, six 

 in an inch. Hab. West coast of North America. 



Animal 



VII. Orcaella, Gray, I. c. 285. 



? Dorsal fin 



-? Pectoral fin ? 



Skull : — brain-case subglobular ; beak very short, two- 

 thirds the length of brain-case, tapering, flat above. In- 

 termaxillary half as wide as beak. Teeth small, conical, 



17.17 

 14.14" 



1. Orcaella brevirostris, Gray, I. c. 285. Phocfena 

 brevirostris, Owen, Trans. Zool. Soc. vi. t. 9. Hab. In- 

 dian Ocean. 



Tribe HI. LAGEN ORHYNCHINA. 



Head attenuated, beaked. Beak of the skull as long as 

 the length of the brain-case, broad, flat above ; edges 

 slightly reflexed and bent up in front of the notch. 

 Nasal triangle elongate. Symphysis of the lower jaw 

 short. Lagenorhynchus, Gray, /. c. 267. 



II. Leucopleurus, Gray, P. Z. S. 1866, p. 216. 



Beak of the skull rather flat above and elongate, bent 

 up on the edge in front of the notch, narrow behind, as 

 long as, or slightly longer than, the length of the brain-case. 

 Teeth-line reaching nearly to the notch. Teeth small, five 

 in an inch. First and second cervical vertebrae united by 

 their bodies, third and fourth by the spinous processes. 



1. Leucopleurus arcticus (T. 0. f. 3, 5, foetus; T. 12. 

 skull ; T. 26. f. 3, tongue). Lagenorhynchus leucopleurus, 

 Gray, I. c. 273. no. 9. Beak of the skull twice as long as 

 the width at the notch. Teeth small, five in an inch. 

 Hab. North Sea. 



III. Lagenorhynchus, Gray, P. Z. S. 1866, p. 216; 

 I. c. 272. 



Beak of the skull rather flat above, bent up on the edges 



c 



