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PROCEEDINGS OF THE NATIONAL MUSEUM 



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The testes occur near the posterior end of the mesentery. These 

 elongated sacs are fused for approximately one-third of their length 

 in one specimen, and completely fused in the other. Each gives rise 

 to a vas deferens shaped like an inverted J, which runs in a posterior 



Figure 2. — Cyphosaccus cornutus, new species: a, Syntype, external appearance (MCZ 

 11721); b, diagram of internal anatomy; c, section through region of stalk. The scale 

 refers to a and b. Abbreviations as in figure 1. 



direction, then curves in the opposite direction shortly before it 

 terminates. The vasa deferentia are about as long as the testes. 



The coUeteric glands are located in the region of the stalk. They 

 are of simple design, with no more than two or three narrow channels 

 leading to the opening into the mantle cavity. 



Remarks: Chace (1942, p. 90) mentioned the presence of "ab- 

 dominal parasites" on a female of Munidopsis erinacea (A. Milne 

 Edwards) from Playa Baracoa, Cuba. This is the parasitized specimen 

 that provided the material for the present study. 



