42 MARINE POLYZOA. 



2. BlCELLARIA GRACILIS. PI. XXXII. 



Cells much elongated, slender, aperture round or suboval, 

 looking obliquely forwards and upwards ; three marginal, and 2-3 

 subraarginal spines above and behind the aperture, and two much 

 longer ; curved, hair-like spines on the anterior and lower margin. 

 Ovicells globose, subpedunculate, attached to the upper and 

 inner part of the margin of the aperture. Avicularia small, capi- 

 tate, on the sides of the cells ; rare. 



Bicellaria gracilis, Busk, Voy. of Rattlesn. i. 3?4. 

 Hob. Bass' Strait, 45 fathoms. 



A delicate slender species, not unlike B. ciliata in habit, but 

 sufficiently distinguished from it by the number and arrangement 

 of the spines, and especially by the curious double spine on the 

 front of the cell. 



3. BICELLARIA GRANDIS. PL XLIV. 



Cells tubular below, much expanded above. Aperture oval, 

 the narrow end outwards, looking upwards and forwards ; 2-5 

 long curved submarginal spines; a single dorsal spine on the 

 outer side, about half way down the cell. Avicularia ? (pro- 

 bably deficient). 



Bicellaria grandis, Busk, I. c. 374. 

 Hob. Bass' Strait, 46 fathoms. 



Quite distinct from B. ciliata, not only in its size, which is 

 nearly three times as great, but also in the form of the cells and 

 of the aperture. The number of spines varies very much, and 

 two or three of them not unfrequently arise from a broad com- 

 mon projecting process or base. 



4. BICELLARIA TUBA. PI. XXXI. 



Aperture round, looking nearly directly upwards ; a digitiform 

 hollow process below the outer border supporting 2-4 long in- 

 curved spines ; 2-3 other, long curved submarginal spines behind 

 or above the aperture, none below it in front. A solitary spine 

 on the back a short way down the cell. Avicularia very long, 

 trumpet-shaped, arising from the back of the cell. 



Bicellaria tuba, Busk, Voy. of Rattlesn. i. 373. 

 Hab. Bass' Strait, 45 fathoms. 



At once recognizable by the remarkable form and unusual 

 position of the avicularium, and also by the peculiar digitiform 

 spinigerous process on the outer side of the aperture. 



