VARIOUS POLYZOA. 



447 



The last figure on the engraving, marked L, represents the mouth of a cell belonging 

 to another polyzoon, and is given to show the curious operculum, with its branched form, 

 like the horn of a fallow deer, and may be contrasted with the simple spiny operculum 

 shown at fig. I. 



Passing to the second plate, we shall find several curious, and one or two bizarre forms 

 of Marine Polyzoa. Fig. A represents the Bull's-horn Coralline of Ellis the Ladies' 

 Slipper, as it is more elegantly and equally appropriately named at the present day. 

 The cells of this species bear a considerable resemblance to a series of delicate, slender- 

 toed slippers, adherent to each other, while from the opening protrudes the beautiful 

 bell-shaped circle of tentacles. Sometimes a rudimentary cell may be found, but always 

 below the aperture. 



At fig. B is shown a creature called the Snake-head Coralline, from the extraordi- 

 nary similitude between it and the reptile from which it takes its name. It is a com- 

 mon species. 



At fig. C. is given a single cell of Bednia mirdbilis for the purpose of showing the 

 series of thorns or spines which surround the mouth. This species is found mostly on 



POLYZOA." II. 



A. Scruparia chelata. X (Ladies' Slipper.) B. JEtea Angulna. X (Snake-head Coralline.) 

 C. Beauia mirabilis. X D. Farcimin ariaaculeata. X E. Gemellaria loricdta. X ** Gemellaria loricata. 



G. Dimet6pia spicata. X H. Notamla bursaria. X (Shepherd's-purse Coralline.) 



I. Notamia avicularium. X K. Caberea Patag6nica. X L. Bicellaria ciliata. X M. Bicellaria tuba. X 



N. Bugula avicularia. X 0. Bugula avicularia. P. Bugula (an avicularium.) X 



The sign X. signifies that the object is magnified. 



shells. Each cell is united to its predecessor and successor by a slender tube, a part of 

 which may be seen in the figure. 



Fig. D is the curious Farciminaria, remarkable for the array of short and stout spines 

 with which its surface is thickly studded. It is a New Zealand species, and appears 

 to be the sole representative of its family. It grows in slender branches, which are 

 dichotomous. 



In the family to which the Gemellaria loricdta belongs, the cells are arranged in pairs 

 and opposite each other, the orifices of the pairs looking in the same direction. This 

 species, represented on fig. E as it appears when magnified, is the Coat-of-Mail Coralline 

 of Ellis, deriving its name from the shape of the cells, which bear no slight resemblance 

 to steel corslets. Fig. F represents the same species of the natural size. 



