FROM THE SOCIETY S GARDENS. 



6Gy 



small, the commissure between them weak, so that in dissection 

 the two are commonly separated *. Vesicula seminalis : This is a 

 long narrow sac, with the usual longitudinal median division. 

 The anterior end is a little truncate, broader than it is behind, 

 where it decreases almost to the bore of the issuing ductus. 

 Ejacidatory ampulla absent or only slightly developed. 



Male Copulatory Apparatus (text-fig. 19). — Basal plate : Lateral 

 margins well chitinised, parallel-sided except for the posterior 

 third of their length, where the plate broadens out. Posterior 

 margin concave. Parameres: At the base these are broad, thin, 

 and transparent bands which fold in around the stout densely 

 chitinous endomeres. Distally, the parameres curve in towards 

 one another, so as to embrace the tip of the remarkable penis. 

 Beyond the end of the penis they are produced forwards and 

 become more strongly chitinous and brown in colour. Sub- 

 apically, on the outside margin of each, there is a small directive 

 hair. Endomeres : These remarkable appendages are much 

 shorter than the parameres, strongly chitinised, deep brown 

 in colour, and slightly curved, the convex side of the curve 

 being on the outside of their length. The distal end is enlarged 

 and displays two large ridges, forming distinct cutting-edges, 

 ea.ch ridge with a separate apex. Between the distal ends lies 

 the main body of the penis. At the base they articulate with 

 almost the whole articular surface of the posterior lateral angles 

 of the basal plate. Mesosome : The penis is a large bulky piece 

 of chitin, the form of which is delineated in the text-figure. 

 Behind it lies the curiously-shaped piece labelled X. This is 

 clearly endomeral— whether upper or lower, I am not prepared 

 to say. The outline of the central portion of this piece is shaped 

 something like a bowl on a pedestal. There are two long back- 

 wardly projecting spines, one on each of the tvi^o outwardly 

 curving cornua : and behind, on each lateral angle at the base of 

 the bowl, a short peg-like spine. 



* Perliaj)* duo to the (;ondition ot the tissues. 



