PELONAIA. 593 



Sub-gen. pandocia, Savigny. 



Animal as iu Cynthia, but tbe right ovary only developed, 

 mytiligera, Sav. 



Sub-gen. peba, Stimpson. 



Body pyriform, adhering by a very small base; test gela- 

 tinous ; orifices sessile, the branchial six-lobed, the anal four- 

 lobed; branchial sac plicated. 



pellucida, Stimp. 



Genus PELONAIA, Forbes and Goodsir. 



Test cylindrical ; orifices terminal, four-cleft, on two 

 small, approximated, papillose eminences; mantle adherent 

 to the test ; no tentacles. Ovaries two, symmetrical. 



Ex. P. corrugata, Forbes and Goodsir, pi. 133, fig. 4. 



This genus, in its cylindrical body and terminal orifices, 

 resembles Siphunculus among the Echinoderms. They 

 have relations also with the Annulosa in the transverse 

 plaits of the respiratory sac and in being bi-lateral. One 

 of their most striking peculiarities is the perfect union of 

 the test and the mantle. The Pelonaia live buried in 

 mud, quite unattached to any other body, and are extremely 

 apathetic animals, presenting scarcely any appearance of 

 motion. 



Species of Pelonaia. 

 corrugata, Forbes and Goodsir glabra, Forbes and Goodsir. 



