THE PEDICELLINA. 249 



not enclosed in the cup, like those of a polype. The alimen- 

 tary canal is a long convoluted tube ; the cavity is lined with 

 cilia, and at the bottom there is a mass of yellowish gi-anides 

 (hepatic cells ?) and occasionally the food may be observed 

 rotating, as if on an axis. 



Some weeks after convincing myself the animal was new, 

 I di'edged between the coasts of Jersey and Brittany a small 

 Pecten, on the shell of which, besides other animals, there 

 was my new friend in great activity, and of much larger size 

 than the one got at Scilly. It was then I learned that my 

 friend had abeady been described — that, in short, it was the 

 Pedicellina of Sars, or at any rate differed therefrom only in 

 such unimportant particulars (such as the retractility of the 

 tentacles) as would at the most constitute a distinction of 

 species. I made this out by studying the development of 

 the animal. In Owen's Lectm-es there is a diagram of the 

 embryonic phases of Pedicellina, and some of these were 

 what I had already drawn from my own animal. One fact, 

 however, is worth meutioning, because, as far as I can ascer- 

 tain, it is not known ; namely, that the Pedicellina is vivi- 

 parous, as well as oviparous and gemmiparous. While 

 examining a cluster of them, I saw something protruding 

 from the mouth ; presently another something rose beside it. 

 I watched anxiously, with a certain flutter. I suspected they 

 were embryos. Slowly they emerged, and the suspicion gi-ew 

 stronger and stronger, till finally three ciliated embryos, in 

 the stages of development indicated at figs. 7 and 8 in the 

 diagram,* swam away in the water. There could no longer 



* Owen : Lectures on Comparative Anatomy, p. 152. 



