24 MARINE FAUNA OF ST. ANDREWS. 



length of the cnp, 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 Gonothyr^a, Allman. 



Gonothyrcea 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 hydrothecfe, 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 gonothecse, however, is characteristic. 



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



Plentiful on Tuhularia indivisa, from deep water, amongst 

 Clytia Johnstoni, on the tests oiAscidia sordida, on Scal2}ellum 

 vulgare, Stenorhynchus rostratus, and Cellepora 2'>U'>nicosa. 

 The capsules are large, translucent, and borne 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 gonothecse, 

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

 scrutiny. Moreover the hydrothecte of this species, contrasted 

 with C. Johnstoni, are much larger and deeper. 



Fam. 2. Campanulinidae. 

 Genus Opercularella, Hincks. 



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

 vol. i. p. 194. 



Abundant on the stems oi Plumularia pinnata, Ohelia lon- 

 gissima, and other zoophytes, and amongst Clytia Johnstoni 

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

 Scriipocellaria scrujwsa. This species presents two well- 

 marked varieties, which occur together on the same stem : — 



