LIGIA. 97 



Explanation of Plates. 



Plate I. 

 Ligia oceanica (Linn.), dorsal view, x 4. 



Plate II. 



Fig. 1. First antenna seen from the side : much 



enlarged. 



Second antenna of left side seen from above. 

 Left mandible seen from below. 

 Teeth and molar process of mandible from the 



posterior side. 

 First maxilla of left side. 

 Second maxilla of left side. 

 Left maxillipede. 

 First pereiopod of male. 

 Seventh, pereiopod of male. 

 Second abdominal appendage (or pleopod) of 



left side of male, showing copnlatory style ; 



anterior view. 

 Fourth abdominal appendage (pleopod) of male, 



posterior view, showing the inner lamella. 

 Third pereiopod of female, attached to the 



epimeral plate, showing one of the brood pouch 



lamellae arising from the sternum internal to 



the appendage. 

 Fig. 13. Fourth abdominal appendage of female, 



anterior view. The inner lamella can be seen 



by transparency; also the afferent (a.b.v.) and 



efferent (e.h.v.) branchial vessels. 

 Fig. 14. Uropod, showing sensory process at the tip of 



the inner tyle. 



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