

Introduction. 7 



As the terminoIo2fv relating" to this branch of research has undergone considerable 

 modification since the pubhcation of ray previous papers in the Transactions of the 

 Royal Society of Edinburgh, the following table has been prepared to show the 

 equivalent technical terms, those used in the earlier papers being placed in brackets 

 after the terms adopted in the present memoir. 



Great Divisions of Body. 



Trunk, including Head (Cephalo-thorax). 

 Tail, including Telson (Abdomen). 



Larger Structures of Trunk. 



Carapace. — Hostruni ; cervical fold ; gastric region ; side wings and lappets ; orbital, 

 antennal, and brauchiostegal spines. 



Trunk Segments (Thoracic segments). — Last seven segments of trunk with tergites 

 and sternites. 



Larger Structures of Tail. 

 Tail Segments (Al)dominal Segments).— Epimera (Pleura) ; telson. 



Appendages of Trunk. 



Sensory and Head Organs. — Eye with pedicle (stalk), ()(;ular papilla, and cornea 

 (visual part). Antennule with peduncle (propodite) and flagella (lashes or 

 sette). Antenna with basal portion, basal scale, peduncle of flagellum 

 (propodite), flagellum (lash). 



Organs of the Mouth. — Epistome or lip. Mandible with body supplied with cutting 

 and molar parts, palp. 1st and 2nd MaxilltB with basal and masticatory parts, 

 palp and exognath. Maxillipede with basal part and palp and exopod. 



TrunL- Lim/is, or Legs (Thoracic limbs). — Seven pairs oi' limljs or legs with 

 endopodites, exopodites, epipodites, gills ; breeding lamellae in females ; 

 in males, (Opening of genital organs. In females, brood pouches and 

 ovisacs. 





