258 Div. 1. VERTEBRATE ANIMALS.— REPTILIA. Class 3. 



I — ^ 



A third bony ramification, larger than the two others, and directed backwards and do'vn- 

 wards, represents, as in Birds, the COTacoid apophysis ; but its extremity remains free. 



The lungs are much extended, and situate in the same cavity with the other viscera. The 

 thorax being in the greater number immoveable, it is by the action of the mouth that the 

 Tortoise breathes, by holding its javs firmly closed, and alternately depressing and raising 

 the hyoid bone : the first of these movements permits the air to enter by the nostrils ; when, 

 the tongue immediately closing their internal aperture, this second operation forces the air 

 into the lungs. The same mechanism occurs in the Eatrachians. 



Tortoises have no teeth; but their jaws are invested with horn like those of Birds, except 

 in the Chelydes, in which they are merely covered with skin. Their ear-drum and palatal 

 arches are fixed to the skull, and immoveable ; their tongue is short, and beset with fleshy 

 papilhe ; their stomach simple and strong; their intestines of mean length, and without a 

 ccecum ; and they have a very large bladder. The male has a simple penis of considerable 

 size ; and the female produces eggs covered with a hard shell. The male may often be 

 recognized externally, by the concave form of the breast-plate. 



These animals are very retentive of life, and will continue to move for many weeks after 

 having been deprived of the head. They require very little nourishment, and can pass whole 

 months and even years without eating. Linnaeus united them all in the genus of 



The Tortoises {Testudo, Lin.), — 



Which have been divided into five subgenera, principally after the form and teguments of their 



carapaces and feet. 



The Land-tortoises {Testudo, Brongniart) — • 



Have a Ijiilgcd carajjace, si'staincd by a bony skeleton wholly solid, and anchylosed for the greater 



part to the lateral edges of the brenst-platc ; their legs are truncated, with very short toes connected 



almost to the nails, and are capable, together with the liead, of being completely withdrawn into the 



armour ; tlic fore-feet have five nails, and the hinder four, all thick and conical. Several species 



subsist on vegetable matter. 



The Greek Tortoise (?'. giwca, Lin.), is tlmt wliich is commonest in Europe. It inhabits Greece, Italy, Sardinia, 

 and (it would appeal) al! round the Mediterranean; is rarely a foot long; feeds on leaves, fruit, insects and 

 worms; and burrows a hole in which it passes the winter: it engenders in spring, and lays four or five eggs 

 resembling those ef Pigeons. 



Among the foreign species, there arc several iw the East Indies of enormous size, measuring' three feet and 

 upwards in length. One is more particularly known as the Indian Tortoise (T. j«(/;ca, Vosm.), of n deep brown 

 colour, with the carapace compressed in front, and its anterior border reverted above the head. Others arc 

 remarkabh! lor the pleasing distribution of their colours, as the Geometrical T. (7'- gt'omctrica, Lin.), a small 

 species with a black carapace, each scale of which is regularly adorned with yelUiw lines radiating from a disk of 

 the same colour. A nearly similar but much larger kind (T. radiatti) inhabits New Holland. 



Some species (the Pi/jrix, Bell), have the anterior portion of the mouth moveable, as in the Terrajjins ; and 

 others (the Kini.ij/s of the same naturalist) can move the hinder part of their carapace, but we have some reason 

 to suspect that this latter conformation is merely accidental. 



Thu: Emydes, or Freshwater Torloises {Eimjs, Brongniart) — 

 Have no other constant characters to distinguish them from the preceding, beyond the further sepa- 

 ration of their 'ors, which are also terminated by longer nails, and the intervals between tlicm are 

 occupied hy nicmlirancs, though they grade even in this particular. They also possess five nails before 

 and four behind. The structure of their feet adapts them to more acpiatic haliits. The greater 

 number live on insects, small fish, &c. ; and their envelope is generally flatter than in the Land-tortoises. 



That of Kurope ('/'. curnpca, Schn. ; T. orhiailarix, Lin ), is the most widely (litrusrd, and inhabits nil the south 

 and east of Europe as far as Prussia. It attains a length of ten inches, and its llcsh is eaten, with a view to which 

 it is fed upon bread and tender herbage ; but it also subsists on insects, slugs, small fish, &c. Marsigni states 

 that its eggs rctpiirc a year to hatch. The Painted Emyde {T. picta, Schac-lf.) is one of the prettiest species, brown, 

 with each scale encircled with a yellow riband, more wide in front. It is found in North America among the 

 reeds, upon the rocks, or on the trunks of trees, from which it falls into the water on being approached. There 

 are very many others. 



III. I'itzinger i-epai ates, under the name of Chdodina, and Mr. Bell mider that of llydraspU, thoBe species wLicU 

 Lave an elongated neck, as Em. loiujicoUis, Shaw, &c. 



Among the Fresh-water Tortoises may he noticed more particidarly, 



