MARINE POLYZOA. 43 



2. HALOPHILA. 



Cells contiguous, attenuated downwards, much expanded up- 

 wards with a large plain aperture ; unarmed. 



Halophila, Gray, Dieff. New Zealand, ii. 292, 1843 ; Cat. Brit. 



Rad. 147. 

 Bicellaria (sp.), Busk, Voy. of Rattlesn. i. 375. 



1. HALOPHILA JOHNSTONI^E. PI. XXX. 



Cells obliquely truncated above with a short spine on the 

 outer angle ; aperture large, oval. Margin slightly thickened. 



Halophila Johnstoniae, Gray, I. c. 



Bicellaria flexilis, Busk, Voy. of Rattlesn. i. 375. 



Hab. Bass' Strait; New Zealand. 



Of a light grey or lead colour, growing in large loose tufts 

 3 or 4 inches in height, and composed of long forked ascending 

 branches. There appears to be very little calcareous matter in 

 the substance of the polyzoary, which is consequently soft and 

 flexible. Within some of the cells, in the lower or contracted 

 portion, is a curious little tridentate organ, the nature of which 

 is not obvious. 



3. BUGULA. 



Cells elliptical (viewed behind), closely contiguous, bi-mul- 

 tiserial; aperture very large; margin simple, not thickened. 

 Avicularia, when present, pedunculate and articulated (frequently 

 coloured red or blue). 



Bugula a, sp. Oken, Lehrb. Nat. 89, 1815 (type) ; Gray, Cat. 



Brit. Rad. 114. 

 Bugula & Oken, I. c. 90. 

 Acamarchis, Lamx. 1816; Blainv. 1830. 

 Crisia, sp. Lamx. 1812. 



Cellularia, sp. Pallas-, Johnst. Brit. Zooph. i. 340 (sp.). 

 Cellaria, sp. Soland.; Lamk. 1816. 

 Bugula, Gray, List Brit. Rad. 114. 

 Avicularia (sp.), T. V. Thompson, MSS. 

 Bugulina (sp.), Gray, Cat. Brit. Rad. 114. 

 Crisularia (sp.), Gray, Cat. Brit. Rad. 114, 117. 



As the typical species of the genus, as here constituted, is B. 

 neritina, which was also taken by Oken as the type of his genus 

 Bugula, recurrence to his name appears to be unavoidable, not- 

 withstanding the more general use that has since been made of 

 Lamouroux's appellation, " Acamarchis." The necessary correc- 

 tion must be made in the Plates of this Catalogue. 



