BICELLARIA ALDERI. 73 



The avicularia, judging from the descriptions of the 

 elder Sars (to whom we are indebted for a detailed and 

 most admirable account of the species) and Smitt^ must 

 be plentifully developed in Scandinavian specimens; but 

 they are not mentioned by Busk; and in none of the 

 British examples which I have examined (a considerable 

 number) have I found any trace of them, except in a single 

 instance. They are shaped like a bird^s head, short, and 

 much swollen behind, and are destitute of the teeth on the 

 rostrum which occur in B. ciliata. The ovicells are 

 semicircular in form, somewhat flattened, and prettily 

 lineated in front, and, according to Norman's comparison, 

 closely resemble the flower of the Calceolaria. 



Genus BUGULA, Okcn. 



BuGULA, Oken, Lehrb. Nat. 1815 : Busk : Smitt. 



AcAMARCiiis, Lamx. 1816. 



Ceisia (sp.), Lamx. 



Cellularia (sp.), Pallas : Johnston. 



Cellaria (sp.), Lamarck. 



AviCELLA (sp.), Vau Beneden. 



AvicuLARiA (sp.), J. V. Thompson, MS. Brit. Mus. : Graj. 



BuGULiNA (sp.), Gray, B.M. Eadiata. 



Crisularia (sp.). Gray, ibid. 



Flabellaria (.sp.), Gray, ibid. 



Oenitiiopora (for B. avicularia), D'Orbigny, Pal. Fran9. 



Ornitiioporina (sp.), D'Orbigny. 



Generic Character. — Zoarium erect, phytoid. Zo- 

 (ECiA boat-shaped, or subquadrangular, elongate, united in 

 two or more series ; aperture occupying a large proportion 

 {occasionally the whole) of the front, not turned upwards 

 or oblique. Avicularia in the form of a bird's head, 

 pedunculate and jointed, usually one on each cell. 



We have a modification of the cell in the present genus 



