Z CLAVID^E. 



THE species of Clava are all strictly littoral, and are 

 found on stones and weed between tide-marks. 



We are indebted to Dr. Strethill Wright* for correcting 

 the error of previous naturalists, who had universally de- 

 scribed the polypites of this genus as naked and single. 

 The polypary is slightly developed, forming a delicate 

 sheath round the creeping fibre, and rising into a little 

 cup at the base of the polypites. 



Reproduction is dioecious, the male and female gono- 

 zooids being borne by distinct colonies. The gonophore is 

 of very simple structure, and destitute of investing capsule. 

 Each ovary produces one or two ova, which are developed 

 into ciliated planuloid embryos. 



The genus has representatives in the New and Old 

 Worlds. It ranges to North America, and is widely dis- 

 tributed through the North of Europe, having been ob- 

 served in Norway, Denmark, the Faro Islands, the Skaga- 

 rack, the Baltic, and Belgium, as well as on our own 

 shores. It is not included in Sars's c Mediterranean Lit- 

 toral Fauna/ All the known species occur in Britain. 



1. C. MULTICORNIS, Forskal. 



HYDRA MULTICORNIS, Forsk, Descriptiones Animalium, &c., 131 ; and Icones 



Berum Naturalitim, pi. 20. figs. B, b. 

 CORYNE SQUAMATA, Couch, Cornish Faun, iii. 11, pi. i. fig. 1 ; Van Bcneden, 



Rech. sur les Tubulaires, 60, pi. v. 

 CLVVA MULTICORNIS, Johnston, Brit. Zooph. SO, pi. i. figs. 1-3. 



REPENS, T. Strethill Wright, Eclinb. New Phil. Journ. (N. S.) for July 



1857, pi. ii. fig. 1. 

 ,, DISCRETA, AUman, Ann. N. H. Nov. 1859. 



Plate I. fig. 1. 

 POLYPITES separate, ranged at irregular intervals along 



* On Clava, Ed. N. P. Journ., N. S. vi. (July 1857). 



