18 MARINE POLYZOA. 



Parasitic. Branches shorter and thicker than in the preceding 

 species. In the shape of the area they are much alike, but in S. 

 tenuirostris, in some cells, and occasionally throughout the 

 greater part of an internode, the area differs widely from the 

 more usual form. It is much expanded and arched above. In 

 this case there is usually a considerable- sized perforation above 

 the mouth of the cell, as occurs not unfrequently also in S. far- 

 ciminoides. These indicate the situation of the immersed ovicells. 

 The avicularium affords an excellent character between these 

 otherwise not readily distinguishable forms. 



4. SALICORNARIA MALVINENSIS. PL LXII1. figs. 1, 2; 

 PL LXV. (bis) fig. 1. 



Front of cell arched above, very acute below. Cells distant in 

 the same series. Surface smooth. Avicularium replacing a cell, 

 rostrum immersed, mandible wide, large, triangular, pointed. 



Hab. Falkland Islands, S. Patagonia, Darwin. 



Readily distinguishable by the perfect smoothness of the sur- 

 face and uniformly arched form of the area above, as well as by 

 the form of the avicularium. 



2. NELLIA. 



Front of cell convex, with a distinct raised border ; a large 

 aperture. No avicularia. Ovicells ? 



Salicornaria, part., Busk, Voy. of Rattlesn. i. 367. 

 Nellia, Busk, MSS. 



Although evidently closely allied to Salicornaria, this genus 

 would seem to be sufficiently distinct in the form of the front of 

 the cell and in the complete absence of avicularia. The ovicells 

 have not been noticed, and are probably deeply immersed. In 

 the small number of series of the cells and their conformation it 

 approaches the next genus, Cellularia. 



1. NELLIA OCULATA. PL LXIV. fig. 6 ; PL LXV (bis) fig. 4. 



Outline of cell rounded above, not contracted downward, 

 truncate below. Two raised hollow, perforated, papilliform pro- 

 cesses below the aperture. Aperture elliptical. Cells quadri- 

 serial. 



Salicornaria dichotoma, Busk, op. cit. i. 367. 



Hab. Prince of Wales Channel, Torres' Strait, 9 fathoms. 



Forms small crowded tufts from one to two or three inches 

 high ; branches very uniform in length, and thence very regularly 

 forked or dichotomous. 



