ZOOPHYTES. 21 



springs from an agglutinated basis of the valves of Pecten 

 operculars and gravel, 8 inches in diameter ; and the 

 gigantic tuft had tubes 11 inches in height. It also some- 

 times fixes the valves of a living Mytilus modiolus so as almost 

 to prevent motion. 



Titbuhiria coronata, Abildgaard ; Hincks, Brit. H. Z. 

 vol. i. p. 119. 



Abundant in deep water. I am obliged to Prof. Airman for 

 discriminating wrinkled specimens of this species, in 1863. 



Suborder II. THECAPHORA. 



Fam. 1. Campanulariidae. 



Genus Clytia, Lamouroux. 



Clytia Jolinstoni, Alder; Hincks, Brit. H. Z. vol. i. p. 143. 



Abundant on Alcyonidium hirsutum and seaweeds in the 



pools near low-water mark, as well as coating the stems of 



Laminarice with a hairy fringe fully half an inch in height. 



In a tine example of the latter many of the stems possess one 



or two branches, and the gonotheca? here and there have a 



stalk composed of several rings. 



Genus Obelia, P6-on & Lesueur. 



Obelia geniculate/, L. ; Hincks, Brit. H. Z. vol. i. p. 149. 



Common on laminarian blades thrown on the West Sands 

 after storms, forming a miniature cover amidst which many 

 Nudibranchs find food and shelter. It occurs plentifully also 

 on Halidrys siliquosa and other seaweeds near low-water 

 mark, and on crabs. In the interior of many of the gonothecse 

 are the young of a Pycnogonidian. 



Obelia hngissima, Pallas; Hincks, Brit. H. Z. vol. i. p. 154. 



Abundant in deep water. It bristles on every branch or 

 fragment of wood which has been submerged for some weeks. 

 It appears also in a very interesting condition in the peculiar 

 rounded balls formed by the rolling action of the waves on 

 the beach ; these zoophytic masses are either spherical or 



