Turner, Ncvvoiis Sj'ston of Cypris. 25 



which has been hardened by the deposition in it of calcium car- 

 bonate ; an ental, thin, flexible layer ; and an intermediate layer 

 of connective tissue [fig. i]. Where the shell is united to the 

 body the ental layer is absent [fig. i, 6]. The connective tis- 

 sue in the shell is a continuation of the connective tissue of the 

 body. Most of the space between the ental and ectal layers 

 not occupied by the connective tissue, is filled by the gonads 

 and lateral evaginations of the mid-gut. 



The body proper consists of two regions, a broad cepha- 

 lothorax and a narrower abdomen. The abdomen is movable 

 on the cephalothorax [fig. 9]. Seven of the eight pairs of ap- 

 pendages arise from the cephalothorax, while the remaining pair 

 (the abdominal rami) arises from the caudal extremity of the 

 abdomen. 



From near the dorsal extremity of the cephalic margin of 

 this creature arise the antennules and from a little below the 

 middle of the same margin arise the antennae. Passing caudad, 

 from the ventral margin arise, in quick succession, the mandibles, 

 1st maxillae, 2nd maxillae, ist leo-, 2nd leg-. 



The mouth, \\hich lies between the mandibles, is bordered 

 by an unpaired upper and by paired lower lips. These, to- 

 gether with the mandibles, not only triturate the food, but serve 

 also as the locus of three pairs of sense organs [fig. 16]. The 

 short oesophagus, which is bordered with large cells [fig. 9c], 

 extends almost vertically dorsad into the fore-stomach [fig. 9]. 

 In the walls of this grinding apparatus cells can be seen. Now 

 follows the stomach, from the walls of which lateral evaginations 

 project into the shell. The wall of this stomach is composed 

 of a single layer of columnar cells [fig. 37,41]. The dorsal por- 

 tion of the stomach is quite large, extending from the cephalic 

 extremity of the cephalothorax to the beginning of the abdo- 

 men [fig. 9,16]. The intestine extends through the abdomen 

 to the dorsally located anus, which is situated near the abdomi- 

 nal rami [fig. 9]. 



The ovaries lie between the shell Jayers. After entering 

 the body on the dorsal side just caudad of the abdomen and 

 thence passing ventrad into the abdomen, the sexual ducts pass 



