181 



91 .*>. The skull of a young Loggerhead Turtle (Ckelone Caouana), with the lower jnw. 



The fronul (u) U excluded from the orfaiul border \>y the junction of the prefrontal (M) 

 with tin- |>o*tfroutal (it): the tympanic excavation of the mattoid (*) u deeper, anil tin 

 mwtoid joint a larger proportion of the parietal (; ) than in the Ckrlone my dot. 



Mvt. Brit. 



916. One of the ribs, with the connate costal plate, of a Loggerhead Turtle (Ckelom- 

 Caoiiana). Presented by C. If. Hawtinx, KMI/ 



917. The crust of the skull of a green Turtle (Ckelone mytlax), with the dried intc- 

 gumenU and some of the epidermal scutes. It shows the small size of the 

 exterior nostrils. 



. The dried remains of a variety of the green Turtle (Ckelone virgata, Cuv.). 



919. The shell of a variety of the green Turtle (Ckelone virgata, Cuv.). Huntenan. 



920. The shell of the Imbricated, or Hawk's-bill Turtle (Ckelone imbricate. 

 Schweigger). 



Fif. Schepff, Test. tab. xviii. 



Hub. The Asiatic and American Seat ; alto the Mediterranean. 



. Brit. 



921. The shell of the Imbricated, or Hawk's-bill Turtle (Ckelone imbricate), It is 



from this species that the most valuable ' tortoise-shell ' of commerce is de- 

 rived. MM. LeverianttM. 



Family Fluviattiia. 

 Genus Trionyx (Mud Tortoises). 



922. The skull, with the horny covering of the alveolar borders of the jaws, of n 



large Mud Tortoise (Trionyr). 



It it long, depressed, triangular, the muzzle forming the obtuse apex, and the bate remark- 

 able for itt four large backward prolongation*. The inferior of thete it the shortest, and ter- 

 minate* in the occipital condyle ; the superior it the longest, and it formed by the extremely 

 developed compreMed superoccipital spine : the two lateral processes are developed from the 

 paroccipitalt and mastoidt. The premaxillary it tingle, very small, and represented by itt 



