DuERDEN — On the Hydroida of the 8.W. Coast of Ireland. 145 



Family. — Seetulariid^. 



1. Sertularella polyzonias, Linn. 



This ubiquitous species was obtained from most of the localities. 



2. Sertularella rugosa, Linn. 

 A small colony was found growing on Sertularia abietina from 

 Log 37, 13 miles south-west of Galley Head. It is described as being 

 common, but this is the only locality from which it was obtained. It 

 is recorded from Dublin Bay. 



3. Diphasia rosacea, Linn. 



This is a form generally distributed around our coasts. It was 

 dredged from Log 37, 13 miles south-west of Galley Head at a depth 

 of 43 fathoms, growing on Sertularia abietina. The small gonothecae 

 were well developed. 



4. Diphasia attenuata, Hincks. 



Examples of this species were found growing on Diphasia alata 

 from Log 37. They show the female capsules and the branches 

 ending in tendrils. It has previously been recorded from Ireland by 

 Prof. Haddon, but only from Dublin Bay. 



5. Diphasia fallax, Johnston. 



This example is known principally from the north of England and 

 Scotland, and is considered by Mr. Hincks to be a northern species, 

 ranging from the coast of Yorkshire to Shetland. It was dredged by 

 the Academy from Log 37, 13 miles south-west of Galley Head off 

 the south of Ireland, at a depth of 43 fathoms ; so that this is the 

 most southerly locality from which it has been found. It has not 

 been recorded from Ireland before. It shows well the male capsules 

 and tendril -like claspers. 



6. Diphasia tamarisca, Linn. 



Three small pieces of this widely distributed species, with female 

 capsules, were got from Log 37. 



7. Diphasia alata, Hincks. 



A small colony from Log 37 shows the male gonophores. This 

 rare species is new to Ireland. It has previously been recorded from 

 Shetland, Hebrides, Falmouth, and Cornwall. 



