EXPLANATION OF THE PLATES. 



PLATE LX. 



Fig. 1. Tubes of the testis slightly magnified, showing their 



general appearance and arrangement. 



Fig. 2. Uninjected corpora Malpighiana. a is enveloped 

 in its own proper capsule, while in b this has been 

 removed. Additional observations have convinced 

 me that these complicated bodies are invested, in 

 addition to the thick elastic covering spoken of 

 in the text, with an inner and much thinner 

 membrane : and that it is this which is to be 

 regarded as the proper Malpighian capsule. This 

 covering, I conceive, is conveyed to each Mal- 

 pighian body by the afferent artery, from which 

 it is reflected over the Malpighian dilatation and 

 plexus of vessels ; and it may often be seen as a 

 distinct structure partially separated from the other 

 constituents of a Malpighian body. The frame- 

 work of elastic tissue, which invests on every 

 side the tubes and Malpighian bodies, is every- 

 where continuous by its outer surface, that of one 

 tube with that of the neighbouring tubes, and 

 that of the Malpighian body is also continuous 

 with that of the tubes which surround this Mal- 

 pighian body. On the other hand, the proper and 

 thin Malpighian capsule is smooth on its outer sur- 

 face, and not connected by this surface with any 

 other structure, save the afferent and efferent ves- 

 sels along which it is continued. This general 

 continuity of the elastic framework is well shown 

 in Plate LVIII. fig. 2. 



Fig. 3. A, a Malpighian body, more highly magnified, dis- 

 playing innumerable small oval and granular cells. 



