Dr. W. C. M'lntosh on the Zoojihytes of St. Andrews. 209 



stalk rather slender (much more so than in Clytia Johnstoni), 

 with several distinct rings below the cup, and many less distinct 

 towards the base. The peculiar slendeniess of the stalk, the 

 length of the cup, and the small number of teeth are the 

 characteristic features. Specimens which resemble Clytia 

 Johnstoni occasionally grow in proximity ; and some interme- 

 diate forms occur. 



Genus G0X0THYK.£A, Allman. 



GonothyrcBa Loveni^ Allman ; Hincks, Brit. H. Z. 

 vol. i. p. 181. 



Abundant on Sertularia abietina and Diphasia rosacea from 

 deep water. The exceeding delicacy of the free margins of 

 the hydrothecse, even in good spirit-preparations, renders it 

 difficult to say whether they are (or were) notched or smooth. 

 It was only by a comparison of observations on many examples 

 that the peculiar crenations were understood, as none showed 

 more than a few, and the majority none at all. The appear- 

 ance of the gonothecte, however, is characteristic. 



Gonothyrcea gracilis^ Sars ; Hincks, Brit. H. Z. vol. i. p. 183. 



Plentiful on Tubularia indivisa^ from deep water, amongst 

 Clytia Johnstoni, on the tests oiAscidia sordida, on Scalpelluni 

 vulgarCy Stenorhynchus rostratus, and Cellepora pumicosa. 

 The capsules are large, translucent, and bonie on a ringed 

 stalk. Growing as this did amongst C. Johnstoni, it at first 

 seemed to be a branched variety of the latter ; but the peculiar 

 nature of the branching and the structure of the gonothecas, 

 which were chiefly borne on the stems, distinguished it on closer 

 scrutiny. Moreover the hydrothec^ of this species, contrasted 

 with C. Johnstoni J are much larger and deeper. 



Fam. 2. CampanulinidaB* 

 Genus Opeecularella, Hincks. 



Opercularella lacerata, Johnston ; Hincks, Brit. H. Z. 

 vol. i. p. 194. 



Abundant on the stems of Plumularia pinnata, Ohelia lon- 

 ffissima, and other zoophytes, and amongst Clytia Johnstoni 

 on the stems of Laminarice ; Prof. John Reid also found it on 

 Scrupocellaria scruposa. This species presents two well- 

 marked varieties, which occur together on the same stem : 

 (a) hydrothecffi on simple stalks of variable length, viz. from 

 three to nine rings ; and {h) branched stems of some height, 

 with the alternate stalks of the hydrothecae composed of from 



