312 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



The Anus — a median aperture on Hie ventral side of 

 the telson. 



The Excretory Openings one pair. These are 



situated at the base of the second antennae on the ventral 

 side. Each is covered by an operculum. 



The Female Reproductive Openings — one pair. These 

 are two large apertures on the sternum of the sixth 

 thoracic somite. 



The Male Reproductive Openings— one pair. These 

 are situated on the ventral side of the eoxopodites of the 

 last pair of thoracic appendages. 



Appendages (Plate II). 



There are five pairs of appendages on the head and 

 eight pairs on the thorax. There are four pairs of 

 abdominal appendages in the female and only two pairs 

 in the male. The appendages are as follows: — 



Cephalon. Somite I. — 1st Antennae (Antennules). 



„ II. — 2nd Antennae. 



„ III. — Mandibles. 



IV.— 1st Maxillae. 

 V.— 2nd Maxillae. 



T b o r a x. Somite VI. — 1st Maxillipedes. 



VII.— 2nd Maxillipedes. 

 VIII.— 3rd Maxillipedes. 

 „ IX. — 1st Pereiopods. 



„ X. — 2nd Pereiopods. 



,, XL — 3rd Pereiopods. 



„ XII. — 4th Pereiopods. 



„ XIII. — 5th Pereiopods. 



Female. Male. 



1st Pleopods. 



Abdomen. Somite XIV. — Absent. 



,, XV. — 1st Pleopods. 



XVI.— 2nd Pleopods 



„ XVII.— 3rd Pleopods 



„ XVIII.— 4th Pleopods 



XIX. — Absent. 



2nd Pleopods. 



Absent. 



Absent. 



Absent. 



Absent. 



