120 
Transactions of the Royal Society of So^ith Africa. 
cross-piece, giving the generative organs the appearance of a slender H . The 
other pair of lobes lie in the posterior region of the thorax and remain 
separate throughout their course. 
In the case of this abnormal development the testis of the right side was 
peculiarly constructed. The anterior lobe was stouter and longer than the 
corresponding one on the left side. The common junction also showed a 
Fig. 1. — Ventral view of Jasus lalandii showing normal (n.g.a.) and abnormal 
(ah.g.a.) genital apertures. 
stouter right-hand portion. The posterior lobe, however, presented no 
marked difference. 
The vas deferens of the left side was normally developed, consisting of a 
much convoluted, fine tube arising from the junction of the testis lobes, and 
gradually widening until directly above the third pereiopod, where the larger 
coils gave rise to a swollen part, which passed ventral wards to open on the 
fifth walking leg. A peculiar modification occurred on the right. The first 
portion of the vas deferens was less convoluted, and hence shorter than the 
corresponding part of the left. The gradual widening gave rise to a longer, 
