SUPPLEMENTAL NOTE ON REPTILES. 



435 



prevents their dilatation. The eyes are small ; the 

 body cylindrical and covered with scales ; the tongue 

 short ; the trachea long ; the heart situate far behind, 

 and provided with a single lung only. 



I. JAWS NOT DILATABLE. 



Amphistieena. 



Amphisl&itafuliginosa, the Shining Ampliisbaena. Two 

 feet long. Inhabits Ceylon. PI. 25. f. 25. 



Tt/pklops. 



II. JAWS DILATABLE. 

 (1.) Body Cylindrical, with Short Tongue. 

 Tortruc. 



(2.) Occiput more or less gibbous Tongue Forked and 

 Extensible. 



Boa. 



Boacanina, the South American Boa. PI. 25, f. 24. In- 

 habits South America. In this genus are included the 

 largest serpents, some of which peach from thirty to 

 forty feet in length. 



Eric. 



Erpeton. 



(3.) Shields un ler the tail ranged in pairs. 



Python. 



Ifurria. 



Dipsas. 



Coluber. 



Dryinus. 



Leptophis. 



Acrocliordus. 



(4.) Serpents provided with Poison Fangs. 



The teeth in this section are fewer in number in the 

 exterior row, than in the preceding section ; the first of 

 those teeth is larger than the others, it is hollow and 

 conducts the poison from the sac into the wound. 



Pseudoboa. 



Trimeresurus. 



Hydropjiis. 



Pelamts. 



Chersydrus. 



(5.) With isolated Fangs. 



Crotalus. 



Crotalus horridtts, the Common Rattlesnake. PI. 25, 

 f. 23. From four to six feet long. Inhabits America. 

 Scytalus. 

 Acanthophis. 

 Lanyalia. 



(6.) Abdomen with Transverse Plates, divided into two 

 under the Tail. 



Trigonooephalia. 



Plataurus. 



Naia. 



Elaps. 



Cobra. 



Vipera. 



FAMILY III. NAKED SERPENTS. 



CfBdlia. Eyes extremely small ; body cylindrical, 

 -ikin naked, with longitudinle folds. 



ORDER IV. BATRACHIA. 



Heart with one auricle ; body covered with naked 

 skin ; lungs two, in the mature condition, but provided 

 with branchiae, like fishes, in their early state. 



Rana. 



Rana taurina, the Bull Frog. PI. 25, f. 21. Inhabits 

 North America. 



Hyla. 



Bufo. 



Bufofuscus, the Brown Toad. PI. 25, f. 22. Inhabits 

 Germany. 



Pipa. 



Salamandra. 



This genus is divided into sections : 



1. Terrestial Tail rounded in' the adult state. 



2. Aquatic Tail compressed. 



Proteus. 



Proteus anffttinus, the Proteus. PI. 25, f. 20. This is 

 the only species of the genus, and has several remarka- 

 ble peculiarities. Besides being furnished with lungs, 

 it has three tufted branchiae on each side, which it 

 seems to retain through life. The skeleton is nearly 

 allied to that of the salamander, but is provided with 

 more numerous vertebrae ; and the general form of the 

 cranium is considerably different. It inhabits dark 

 subterraneous streams, in Carniola ; and is the only 

 animal known to exist in such situations. 



Siren. Provided with a short thick adherent tongue ; 

 having both persistant branchiae and interior lungs ; 

 body elongated, cylindrical, and furnished with a com- 

 pressed tail ; it has two feet only, which are placed for- 

 wards on the body, each provided with four toes. 



Siren laeertina, the Siren. PI. 25, f. 19. From two 

 to three feet long. Inhabits the marshes of South Car- 

 olina. There is but one species of this remarkable 

 genus : which, like the Proteus, retains during its life, 

 three free branchial tufts, situate on each side of the 

 neck, while it has at the same time lungs for breath- 

 ing, formed in the ordinary manner. 



