144 CETACEA. 
Rytina, Miger, Prod. 141, 1811; Oken, Lehrb. Nat. 685; Wa 
er, . : ¥ : 7, " 
Rhytina, Brandt, Mem. Acad. Imp. Peters. vii. 1846; Symi 
Sirenologice, 1846. a 
Rityna, Lesson, Nov. Reg. Anim. 155, 1842 (misprint). 4 
Stellerus, Desm.; Cuvier, R. A. 1. 275. 
Hydrodamalis, Retzius. 
Dr. Knox (Cat. Prep. Whale, p. 37, 1838) shows that the 
substance in the palate which Steller describes, and which has 
been mistaken for teeth, is only a horny skin of the bent-down 
portion of the two jaws, common to this animal and the Dugo 1g. 
This suggestion has been adopted by F. Cuvier (Cetac. 377) and 
Brandt in his Sirenologia. The latter figures them, and ex- 
hibits their structure under the microscope. This horny sub-— 
stance bears evidently a considerable analogy to the baleen of 
the common whale. 
1. Rytina cGicas. The Morsxata Korova. 
Black. 
Manate seu Vacca marina, Steller, N. Act. Petrop. u. 294. j 
Trichecus Manatus, Miill. Prod. Z. Dan. . 
Trichecus (Manatus) borealis, Gmelin, S. N.1.60; Oken, Lehrb. 
Nat. 685. 4 
Manatus gigas, Zimmerm. Geog. i. 426. a 
M. borealis, Tilesius, Jahrb.i. 23; Pallas, Zool. Ross. Asiat.i.272. 
Manatus Stelleri, Ozeretskowsky, Nov. Act. Petrop. xin. t. | 3H 
f. , embryo. - 
Rytina Stelleri, Illiger, Prod. 141; Desm. N. Dict. H. N. xix, 
574; Reichb. Syn. Mam.15; Icon. Cetac. t. 22. f. 69, from Stel- 
ler; Anat. Cetac. t. 25, from Brandt. del a 
Stellerus borealis, Desm. Mam.510; Lesson, Cetac. 88; Jardine, 
Nat. Lib. viii. 307. 4 
Rytina borealis, F. Cuvier, Cetac. 41. 
Rityna Stelleri, Lesson, N. Reg. Anim, 155. < 
Rhytina borealis, Brandt, Mem. Acad. Petrop. 1846; Symb. 
Sirenolog. 141. t. 1-4, skull; t. 5, ideal figure. he 
Stellere, Cuvier, R. A. 1. 275; Oss. Foss. v. 256. 
Whale-tailed Manate, Penn. Quad. ii. 292. : 
Hab. Arctic Ocean. Behring’s Straits. Skull, imperf. Mus. 
St. Petersb. ia 
The Sea Ape, Penn. Quad. ii. 301 (Trichecus Hydropitheeus, 
Shaw, Zool.i.247; Manatus Simia, Illiger, Abh. Berl. Akad.1813; 
M.? Hydropithecus, Fischer, Syn. 502, all from Steller) is per- 
haps another animal of this family, if it is not a Seal? q 
