29 



* Teeth none. Upper jatv with tusk. 



MoNODON, Fah., Linn., not Swain. Ceratodon, Brisson, 

 Pallas. Diodoii, Storr., not Linn. Narwalus, Lacep. 



Head round and convex in front; dorsal fin none; lower 

 jaw not so wide as the upper. 



The Narwhal. Mouodon monoceros. 



Monodon Monoceros and M. unicornu, Linn. 



M. Narwhal, Dlumh. 



Narwhaliis Andersonii and N. microcephalus, Lacep. 

 Scoreshij, Arct. Reg. i. 486 — ii. t. 12, f. 1, 2. Fleming, 

 Went. Trans, i. 131. Cuv. Oss. Foss. v. t. 22, /. 7. 

 Home, Anat. Camp. ii. t. 42. Albers, Icon. t. Alton, 

 Osteol. ix. t. 6. 



Narwal, Camper, Cetac. t. 29, 30. Klien, Pise. t. 2,/. 

 c. from spec, at Dresden, taken in the Elbe, 173G, cop. 

 Lacep. t. 4,/. 3. 



Black ; when old whitish marbled. 



Inhab. North Ocean, Scotland. 



Right tusk generally not developed. Female generally 

 without tusk, but sometimes has one; see Linn. Trans. 

 xiii. 620. 



1. Narwalus microcepalus, Lacep. t. b, f. 2, from draw- 

 ing of Mr. W. Brand, is only a bad representation of this 

 species. 



2. Narwalus Andersoniaiuis, Lacep. Cetac. 1C3, from 

 Anderson, described from same specimen, as figured by 

 Lacep. t. 4,/. 2. 



Skull, length entire 216 .... 20-6 



„ of nose 9 9 .... 9-3 



Width of orbit 146 .... 14-0 



„ of notch 8-0 .... 7-9 



„ intermJxillaries 3'0 .... 3'6 



In the Museum of the College of Surgeons there are se- 

 veral Hunterian preparations of the skull of this animal, 

 Nos. 1147, 1148, 1149, 1150, 1151, showing the two rudi- 

 mentary teeth inclosed in the cavity, in the female, and 

 the single one in the male skulls. Narwal female skulls 

 have two rudimentary teeth in upper jaw, which are rarely 

 protruded, Kno.v. In the foetus, on each side the upper 

 jaw, in the usual place, are two hollow teeth, obviously 

 the extremities of the spiral permanent teeth of the male ; 

 they are completely imbedded in the jaw, and if the ani- 

 mal is a male the left tooth continues to grow, the right 

 after a time fills up, its central cavity for containing the 

 pulp disappears, and after attaining a growth of five or six 

 inches, the jaw elongates to correspond with the growth of 

 the animal and the other tooth, and the abortive tooth re- 

 mains imbedded in the jaw for life. — Kno.v, Trans, R. Soc. 

 Edin. ii. 413. Scoresby gives a very good account of this 

 animal, Arct. Reg. i. 131. 



The best figures are those oi Score shy, t. 15, then Sow- 

 crhy, Brit. Misc. t. , but this has a second horn errone- 

 ously added. Bonnaterre's figure is far too ventricose. It 

 has been copied by Lacep. t. 4, f. 3, Bliimenbacli, t. 

 and others; on the other hand, DuhameVs Pecli. \\i.t. 

 26,/. 1, is too slender, and with too small a head. 



Anarnacus, Lacep. Monodon, Fab. Ancylodon, lin- 

 ger. Heterodon, part, Desmarest, Cue. 



Upjier jaw with only two small, conical, sliglitly curved, 

 blunt teeth, prominent in front ; lower jaw toothless ; 

 body elongate, roundish ; pectoral distinct ; dorsal minute. 



The Anarnak. Anarnacus Grcenlandicus. 



Anarnakus Grojnlandicus, Lacep. Cet. 164. 



Monodon spurius (Anarnak), O. Fab. Fauna Groen. 31. 

 Bonnat. Cetol. 11. 



Delphinus anarnacus, Desm. Mam. 520. 



Black ; teeth scarcely an inch long. 



Inhab. Greenland. 



Tins species is only known from Fabricius' description ; 

 he is so accurate an observer that I am loath to doubt the 

 existence of anything he has described ; especially as he 

 appears to have seen it himself. I am inclined to believe 

 (hat Lacepede and Illiger were right in considering it as a 

 distinct genus. 



M. Cuvier {Oss. Foss.) regards it as a Hyperoodon, 

 and he only believed in the existence of one species 

 of the genus. M. F. Cuvier, who misunderstood the 

 description of Chemnitz willi respect to the teeth of 

 Balaina rostrata, is inclined to unite it to that species, with 

 which it agrees in being all black, but observes they differ 

 greatly in size. — F. Cuv. Cetac. I'-iQ. It cannot be the 

 young Narwhal, for the back is finned. 



** Teeth of tipper and lower j ate conical, deciduous. 



Beluga, Gray [Spic. Zool.), Lesson, Bell, 1837. Ph}'- 

 seter, Linn. part. Catodon, Artedi, part. Cetus, Brisson, 

 part. Cachalot, Lacep. Delphinapterus, Lacep. Del- 

 phis, Wagler. Phocsena, part, F. Cuv. 



Teeth conical only on the front half of the jaw, oblique, 

 often truncated, and the upper often deciduous ; head 

 rounded ; forehead convex ; dorsal fin none ; skull with 

 the nose and the hinder wing of the maxilla bent down on 

 the orbits, making the forehead very convex ; lower jaw 

 not so wide as the upper, with the condyle low down below 

 the middle of the hinder edge ; pectoral sub-oval. 



The genus Delphinapterus was formed by Lacepede to 

 contain this animal, which he before described as a Cato- 

 don, and the D. Senedette, which is probably a Catodon. 



There is a great similai-ity in general form between the 

 skull of the Phocmna, Beluga and Monoceros, but inde- 

 pendent of the size and teeth, they differ in the form of the 

 convexity in front of the blower ; in Beluga the front of 

 the blower is flattish, in Monoceros there is a broad, half- 

 oblong convexity, and in Phoccena a squarish tuberosity. 



The Northern Beluga. Beluga Catodon. 



Physeter Catodon, Linn, from Balaena minor, Sibbald. 

 Phal. ?. 



Balajna albicans, Muller. 



Delph. leucas, Pallas, Zool. Ross. Asiat. t. 32, 2 . Mem. 

 Wern. Soc. iii. 17, S. Cuv. Oss. Foss. x. t. 22, /. 5, 6. 

 Bell, Brit. Quad. 491, Jig. 



Catodon Sibbaldii, Fleming, B. A. 29. 



B. borealis, Lesson. 



Physeter macrocephalus, S. Gmelin, S. N. 



