PHRONIMA SEDENTARIA. 27 



ber of young Phronimce, in company with their parent. 

 In the British Museum is a specimen of Doliolum papil- 

 loswn, of Delle Chiaje, from Naples, in which a specimen 

 was found, and which is represented in our figures at the 

 head of this description,* the small white dots repre- 

 senting small masses of calcareous matter. Mr. Mac- 

 Donald has informed us that he has kept some alive 

 while inhabiting specimens of Doliolum, and that it was 

 chiefly through the agency of the crustacean that the 

 medusa was propelled through the water, adding that as 

 they progressed they frequently rolled over and over. 



* Figured also by Delle Chiaje, " Animali Invertebrati, tav. xxiii. ; see 

 also Otto, in " Nova Acta," xi. p. 313. 



