204 HANDBOOK OF INVERTEBRATE ZOOLOGY. 



(vii.) Study in another specimen the way in which these 

 ossicles are moved upon each other by the gastric muscles, 

 and make drawings of the outer and inner surfaces of the 

 stomach. 



v. The antennary glands. After removing the stomach, 

 notice on each side of and a little anterior to the oesopha- 

 gus, and in front of the mandible, the flat, coiled, greenish- 

 white antennary gland. 



iv. The female reproductive organs. These vary in size 

 according to the season. They consist of the ovary, two 

 seminal receptacles, and the oviducts. 



1. The ovary consists of two lateral portions (Fig. 

 103, ov, ov), which run from the outer angles of the 

 carapace along its anterior border, and then backwards, 

 inwards, and downwards, along the stomach, and then 

 upwards and backwards on each side and a little above the 

 intestine as far as and sometimes into the first abdominal 

 somite, and a median portion or cross-bar (Fig. 103, o) 

 which joins the two lateral halves just above the pyloric 

 pouch of the stomach. 



2. The seminal receptacles, (Fig. 103, p) are two 

 pouches which vary greatly in size according to the season. 

 They are on the inner surface of the sternal plastron, and 

 each communicates, on its upper surface, with one of the 

 lateral divisions of the ovary. 



3. The oviducts are very short tubes, which run from 

 these pouches to the female reproductive orifices, in the 

 sternum of the somite which carries the third pair of 

 pereiopods. 



4. Dissect out and draw the female reproductive 

 organs. 



5. If a female is found carrying eggs, notice the man- 

 ner in which they are fastened to the hairs of the abdominal 

 appendages and covered by the abdomen. 



