668 Illustrations in British Zoology : — 



the Authority of the following Extract, communicated by J. M. 9 

 Philadelphia. — i " On Sunday last was killed, on Plantation 

 Huis't Dieren, belonging to Governor Murray, a camoudy 

 snake, measuring 14 ft. long and 13 in. in circumference at 

 the natural size of the body ; but, at the stomach, was dis- 

 tended to the enormous size of 31 in. On opening it, it was 

 found to contain an entire alligator, recently swallowed, and 

 measuring 6 ft. long by 28 in. in circumference. From the 

 appearance of the neck of the alligator, it was evident that 

 the snake destroyed him by entwining round that part ; and 

 so severe seemed to be the constriction, that the eyes of the 

 alligator were actually started from their sockets." (Royal 

 Gazette of Demerara, Oct. 8. 1822.) 



Since the preceding was prepared for sending to the printer, 

 No. 274-. of the Penny Cyclopcedia has been seen. In this 

 number, under the subject Boa, is very interesting information 

 on the structure and habits of serpents of the boa kind. The 

 account is not completed in No. 274. It is illustrated by 

 some engravings.] 



Art. III. Illustrations in British Zoology. By George John- 

 ston, M.D., Fellow of the Royal College of Surgeons of Edin- 

 burgh. 



Class CRUSTACEA. Subclass C. mandibula x ta. 



Legion EDMOPHTHA'LMA. 

 Character. — Body composed of segments, of which the 

 first forms a distinct antenniferous head ; segments of the 

 thorax separate; eyes two, sessile, immovable, conglomerate 

 or compound ; branchiae in the form of lamellae attached to 

 the base of the feet, or to the abdominal segments. # 



[* The great division [of the class Crustacea of animals] named by Dr. 

 Leach Malacostraca Edriophthalmp, comprises those hard-shelled Crus- 

 tacea which have three pairs of foot-jaws, five pairs of legs, and two other 

 pairs of organs resembling legs, but which, in the Lobsters and Crabs, are 

 converted into additional foot-jaws ; they have also the thoracic portion of 

 the body divided into segments ; and their eyes are not placed at the ex- 

 tremity of footstalks. 



This division comprises three orders : — 1st, the Amphipoda, or Leaping 

 Shrimps, having the fore-legs generally large and cheliferous, and the body 

 compressed and narrow ; 2d, the Isopoda, having the legs of equal size 

 and unarmed, with the body oval and depressed, and composed of equal 

 segments, — containing the Wood-lice and allied groups; and, 3d, the 

 Laetnodipoda, a singular group, having the body slender and cylindric, 

 with unequal-sized legs, some being cheliferous, and the segments unequal." 

 — J. O. Weshvood, in the' Transactions of the Entomological Society of hon- 



