2. HALICORE. 301 



498 ; Knox, Cat. Prep. JVhale, 35, 1838 ; J. Brookes, Cat. 3Ius. 404 ; 



Grai/, Cat. Cetac. B. M. 

 Rosmariis (pars), Boddaert. 

 Tricheciis (pars), Erxlch. 



Trichechiis (part), Artedi, Gen. Pise. 80; Syn. 108. 

 Platystomus, O. Fischer, Zooyn. 19. 



Cervical vertebrae 7, dorsal 19 (ribs 19), lumbar, sacral, and coccy- 

 geal 30, =56; V-sbaped bones commencing between the thirty-second 

 and thirty-third vertebrae. Weight of cranium and lower jaw 7 lbs. 

 6ozs., of bones of trunk 20| lbs., of pectoral extremities 31bs.,= 

 30 lbs. 10 ozs., the weight of an entire male adult human skeleton 

 being only 12 lbs. The bones are extremely dense and of stony 

 hardness ; they contain no medullary ca^'ity, but consist of a texture 

 nearly as close as ivory and capable of being poUshed. — Knox, Gat. 

 Prep. 35, 1838. 



The tusks and teeth are " composed of two substances, a cortical 

 and a medullary ; the cortical, although holding the situation of 

 enamel, is similar to bone, and possesses none of the qualities of that 

 peculiar substance ; the medidlary portion is extremely hard, of a 

 dense texture and homogenous appearance." — Knox, Cat. Prep. 36. 



" The front portion of the upper and lower jaws is covered in the 

 recent state with a horny covering. The outer surface presents 

 numerous rough-looking elevations, many of them darker around 

 the circumference tlian in the centre ; these are arranged in rows of 

 seven or eight each, running from each side towards the mesial line, 

 but with a slight inclination from behind forward. The whole sub- 

 stance is composed of bristles about one-eight of an inch in length, 

 arranged vertically, and agglutinated together by a substance of a 

 horny nature. Since examining the Dugong, now seven years ago, 

 from which the preparations nos. Ill and 112 were procured, I 

 have been convinced that SteUer was simply describing a similar 

 substance, no doubt on a larger scale, as the animal is said to reach 

 26 feet. The substance is neither teeth nor analogous to teeth, and 

 we might with the same propriety describe the rough and semi- 

 horny substance covering the osseous palate of the sheep, cow, &c., 

 as a tooth. As a proof that it is not analogous even to teeth, the 

 surface of the lower jaw contains rudimentary teeth imbedded deep 

 in the osseous texture." — Knox, Cat. Prep. 37, 1838. 



Cervical vertebrae 7, all free ; first and second no lateral process ; third 

 to the seventh thin, with small lateral processes. — Mtis. Edinb. 47. 



Dr. Knox susjiects there are two species, one with what Sir E. Home 

 calls the permanent, and the other with what he, erroneously, as Dr. 

 Knox suspects, calls the milk tusks. — Trans. Roij. Soc. Edinh. ii. 395. 



1. Halicore Dugong. The Indian Dugong. 



Halicore australis, Owen, Jiikes''s Voy. H.M.S. Fly, ii. 225. f. 1. t. 27. 



f. 3. 328. f. 5 ; Maegittivray, Voy. Rattlesnake, i. 48. 

 H. (Trichechus) Dugong, IlUqer, Prodr. 140; Schreb. Sdugeth. t. 380, 



f. 5, 6. t. 382, 383 ; Reichb. Syn. Mamm. 16 ; Icon. Cetac. t. 22. f. 70, 



71, from F. Cuvier et Quoy. 



