30 



CONNECTICUT GEOL. AND NAT. HIST. SURVEY. 



[Bull. 



intestine— 



neri^ecordj, 

 pereiopod 



oosteffite 



-ovari/ 

 -.^/lepato- 

 panc/vas 



Fig. 3. Cross section through a female Amphipod. 



The testes are small, slender, fusiform, paired organs which 

 lie directly below the heart and dorsal to the intestine. These 

 organs taper posteriorly to two delicate tubes, the ejaculatory 

 ducts, or vasa deferentia, which open by papillae on the ventral 

 side of the last thoracic segment. In the breeding season these 

 papillae enlarge considerably to form' copulatory organs (Fig. 31). 

 The glandular portion of the testes usually lies behind the 

 second and in front of the fifth segment of the thorax. Its 

 anterior end is very attenuated and serves as a kind of ligament 

 to hold the organ in place. 



In the female 4he ovaries have the same position as the 

 testes in the, male but are somewhat longer. In form the ovary 

 is irregularly cylindrical and when ripe may be more or less 

 inflated. The oviduct opens from the lower outer surface of the 

 ovary at a point corresponding to the fifth thoracic segment and 

 continues as a simple straight tube to the exterior at the base 

 of the fifth coxal plate. 



Usually there are four pairs of marsupial plates or oostegitcs 

 borne on the second, third, fourth, and fifth thoracic legs, but 

 in some species there are six pairs attached to the last six legs, 

 and in the Caprellidea there are only two pairs, belonging to the 



