ir>2 



]\Ir. II. A. r.nvlis nn a 



consist of a non-staiuin<j, clear, struct u re less substance, in 

 close contact with the tall columnar cells liuiu}^ the spcrma- 

 thecal duct. Into its outer portion each of these cells seiuls 

 a iiuiri'r-like or clavate protoi)lasinic process {i\f^. 7, /V.). 

 Hcvond this process there are sometimes visible traces 

 of a cavity in the matrix, from which the process has 

 evidently just been withdrawn, and which is (U)ubtless filled 

 with secreted matter which has not yet become solidly fused 

 with the rest of the wall of the tube. When the spermato- 

 l)liorc is dissected out from the spei-mathccal duct, and the 

 epithelium of the latter teased o(f with needles (;in operation 

 which it is not easy to perforin eoni])letcly, owing to its vcvy 



Fiy. 



BM 



, -M. 



Purtiuu of tho lining- epilLeliiini of tlie duct of tlio sperniiitlK'ca. 

 Ji.M.^ bastunent-iucmbrane ; M., eecreted matrix (wall dI" 

 trnnipL't-?ha])ed tnbe) ; 7V^., nuciens; iV., protoplai-mic pro- 

 cesses secretinff tlie substance of the tube. (Cain., uil-iium. 

 iV'j oc. '1 Zeiss.) 



close adherence), some of the i)rotoplasmic processes are 

 torn out, but the majority of them are broken off from 

 their cells and remain embedded in the matrix of secreted 

 matter. It is these processes, I believe, which give the 

 "wall of the spermatophore its mosaic-like appearance when 

 viewed from tlie outside. Beddard considered that this tube 

 was probably of chitinous nature ; but, owing to its being 

 considerably softened and alcered by caustic potash, I am 

 inclined to think it is of a less hard material. 



The trumpet-like tube is filled with slightly eosiiiophilous 

 matter of a yellow colour and a stratified afjpearance, down 

 the ceiitre of which there is a very narrow lumen, containing 



% 



