MARINE POLYZOA. 33 



Sec observations under the genus Salicornaria, p. 16. A 

 second and very curious species of this genus, from South Africa, 

 has occurred since this Catalogue was drawn up, which will be 

 afterwards described. 



1. FARCIMINARIA ACULEATA, n. s. PL LXIV. figs. 4, 5; 

 PL LXV. (bis) fig. 6. 



Sides of cells within the margin beset with furcate spines. 

 Ovicell cueullate, external ; surface aculeate. 



Hob. Tasmania, Hooker; New Zealand, LyalL 



Fain. 6. GEMELLARIADVE. 

 Cells opposite in pairs. 

 Gemellariadae, Busk, Voy. of Rattlesn. i. 383. 



Synopsis of Genera. 



1. Gemellaria. 



2. Didymia. 



3. Dimetopia. 



4. Notamia. 



a. Each pair arising from the pair next below it. Each pair at 

 a bifurcation giving origin to two pairs ; no avicularia. 



In some respects approaching the Bicellariada?, this family 

 would yet appear to constitute a very natural group, distinguished 

 from the Bicellariadse, not only by general habit and the peculiar 

 position of the cells in pairs, but also by the absence in all cases 

 of pedunculate and articulated avicularia. Where, in this family, 

 these organs are present, as in Notamia, they are of a very pecu- 

 liar character and in a very peculiar relation to the rest of the 

 polyzoary. It might moreover be remarked, that the association 

 of the genus Notamia\\itli the others included in the same family, 

 is somewhat forced and artificial. The very curious structure of 

 the polyzoary in this genus would almost justify its being regarded 

 as the type of a distinct family, in which case the total absence 

 of avicularia w r ould afford an additional diagnostic character of 

 the Gemellariadae. 



With reference to Emma crystallina, in which the cells are for 

 the most part in pairs and apparently opposite, it must be ob- 

 served, that at each bifurcation a third and alternate cell is inter- 

 posed between the two, and that in Emma tricellata there are 

 three alternate cells in each internode. When it is noticed also 

 that in Menipea, for the most part, the normal number of cells in 

 each internode is three or six, but that the latter number is not 



c 5 



