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Proceedings of the Royal Society of Edinburgh. [Sess. 
its own sternite. These grooves have, generally speaking, a transverse 
direction, the anterior however running (latero-medially reckoned) some- 
what backwards, the posterior somewhat forwards; consequently, when 
Fig. 1. — Ligia'oceanica (male) from ventral aspect, to show the general alignment 
and the direction of flexion of the basipodites. On the right side of the 
animal (left side of illustration) the basipodites have been cut across at their 
proximal end. On the right side of the animal the basipodites have been 
left in situ . 
the basipodites are flexed on the body, the antero-posterior distance 
between their distal ends is considerably less than that between their 
proximal ends (see fig. 1). This arrangement, to a certain extent but not 
