304 REPORT ON ZOOLOGY, MDCCCXLIV. 



pair of legs, in the position of the first abdominal segment, an organ appears 

 at each side, which is subservient to the vegetative existence only, and is 

 cast off at the time of hatching. It consists of a round disk, supported on 

 a foot-stalk of moderate length. It has a very delicate investing membrane, 

 remains colourless and semitranspareut, and the somewhat convex outer sur- 

 face of the disk is pressed against the coats of the egg. The author gives 

 reasons for supposing that this organ (which has not been observed hitherto 

 in any other insect) serves the embryo for respiration. 7. The mucous 

 layer of the germinal membrane, as in other true Insects, is expended 

 entirely in the formation of the intestinal canal, and in embryos which have 

 passed the middle period of the vegetative existence, the yelk, still of consi- 

 derable bulk, is found contained in the stomach, not in a distinct yelk- 

 bag,as is the case with the Decapods among Crustacea. Prom obser- 

 vations made on various other Insects, it appears that the mucous 

 layer goes to the formation of the stomach alone, and that the gullet 

 (oesophagus) and intestines are produced from the latter at a subsequent 

 period. Towards the end of the vegetative period the alimentary canal 

 shows a small globular empty appendage (crop), a large stomach filled with 

 yelk, and four malpighian vessels (ductus hepatici.) Soon after hatching 

 the author found the crop (iugluvies) larger, and filled with a mass different 

 from the yelk, and which can only be food taken in by the mouth ; the 

 gizzard (proventriculus), which had been faintly indicated in the embryo, 

 was now more developed ; the true stomach (veutriculus chylop.) smaller, 

 with two peaks ; the bulk of the contained yelk diminished ; the malpighiau 

 vessels abeady increased in number to six. 



Descriptiones animalium qiue in itinere ad maris austra- 

 lis terras per annos 1772, 1773, et 1774, suscepto collegit, 

 observavit et delineavit Fr. Reinh. Forster, mmc de- 

 mum editse auctoritate et impensis Academise literarum regime 

 Berolinae, curante H. Liechtenstein. Berlin, 1844. 



The portion of this interesting work which regards Entomology is not 

 considerable, being confined nearly to the description of some Insects found 

 in the islands to the west of Africa. 



Tellkampf (Miiller's Arcliiv, Anat. 381, \Yiegm. Arch, i, 

 318) has communicated very interesting particulars respect- 

 ing the animal life in the mammoth cavern of Kentucky. 



Besides one or two peculiar forms of Fishes, and a number of Infusoria, 

 in a subterranean lake five miles from the entrance and more than one mile 

 in length, there are of Crustacea a new Astacus, and a new genus of Amplii- 

 poda (Triuni) : of Insects two new coleopterous genera, Aiiophihalmus and 



