84 THE CRAG POLYZOA. 



recent species is Lunulites radiata, or some of the forms figured under that title. Among tlie 

 representations of this species are some which bear a strong resemblance to L. capulutf, B., 

 though of far smaller dimensions. 



SYNOPSIS OF GENERA, 

 (a) Each cell witli a vibracular chamber at its apex or distal extremity. 



1. CUPULARIA, Lamx. 



(6) The cells and vibracular chambers disposed in separate, usually alternate rows, 

 radiating from the centre. 



2. Lunulites, Lamx. 



(c) Certain of the cells of a different conformation to the rest, furnished with a 

 vibraculum. 



3. Selenaria, Bus/c. 



(d) No apparent vibracular chambers distinct from the true cell. 



Stichopora, Hagenow. 



(e) Vibracula replaced by small avicularia ; mouth of cell circular. 



4. Conescharellina, D'Orhigny. 



Of these four genera, two only are represented in the Crag fossils. 



