GENERATIVE OKGANS. 8S 



et aigues a leur extremite ; elles naissent chacune d'une 

 espece de bulbe, forme de deux renflements places I'un 

 au dessus de I'autre, dont le premier ou I'infcrieur 

 est liemisplierique, et le second ou le superieur en disque 

 arrondi ; c'est au centre de ce dernier qu'est attachee 

 epme. 



In some cases the eggs which are at first apparently 

 smooth, after a few days will be found to be covered 

 with long hairs. 



PL LXII, fig. 10 represents the testis of Papiriiis 

 omatus. It consists of a simple tube on each side 

 of the body {a), opening into a triangular reservoir 

 with the base in front. The two posterior sides of the 

 triangle are accompanied by a glandular accessory 

 organ, containing a central cavity full of minute 

 globules, the largest of which do not exceed • 000083" 

 in diameter, while the majority are much smaller. 

 From the posterior angle of the reservoir a short 

 and narrow vas deferens runs into the ductus ejactu- 

 latorius, which is also short and pyriform, opening, like 

 the vulva, between the anus and the base of the sal- 

 tatory apparatus. 



The development of the spermatozoa proceeds as in 

 Ohisium (' Phil. Trans.,' 1861), The testis contains 

 small cells, about '00025" in length, and collected into 

 masses of various sizes, which have probably arisen 

 within mother cells ; their size does not appear to 

 depend in any way on the stage of development of the 

 Spermatozoa. The small cells which compose them 

 are at first somewhat oval ; gradually one end 

 elongates, until at length they resemble in form the 

 egg of a Gynips, consisting of a thread, with a small 

 swelling at one end and a large oval body at the other ; 

 this, however, is not probably the mature form. The 

 testis also contained numerous greenish, oval, or 

 somewhat quadrate bodies, about '0002" in length, and 

 exactly resembling the similar bodies which I found in 

 the testes of Chelifer and OUsiiim, and which so 

 curiously resemble the spermatozoa of Polydesmus. 



