252 NATURAL HISTORY SOCIETY OF DUBLIN. 



and Crabs, some of them deep sea forms, only met with occasionally 

 after storms or gales of wind that have been blowing towards shore. In 

 about the space of an hour most of the specimens mentioned in this paper 

 were collected, a few species only having been added to the list on two 

 subsequent visits ; and although it necessarily gives but an imperfect 

 account of the marine Invertebrata which may be obtained from that 

 productive shore, I believe it will be found to supply some additional 

 species to those already recorded from that favourite locality. 



The following is the list of the species collected, with some occa- 

 sional remarks on their habitats, distribution, &c. : — 



ZOOPHYTA. 



Fam. CoRYNiDiE. 



Kydr actinia echinata. — This is a not uncommon incrusting sponge- 

 like zoophyte on old shells from deep water. The specimen obtained 

 coats the shell of Fusus Islandicus. 



Fam. Tubulariadjs. 



Tuhularia gracilis. — This species is said to inhabit deep water, 

 growing in clusters. Several of the polype-tubes in our specimen are 

 bound together by an incrusting polyzoon, the Cellepora pumicosa. The 

 egg of a Dogfish is also securely moored by its long elastic filaments to 

 the lower part of the tubes. 



Fam. Sertulariadje. 



Sertularia alietina, Sea-fir Coralline This beautiful coralline is 



common on our coasts ; it inhabits deep water, being attached to shells 

 and stones ; some of the specimens collected were found to be covered 

 with the minute shells of Spirorlis nautiloides, as stated by Dr. John- 

 ston in his " British Zoophytes" to be not uncommonly the case. 



Sertularia argentea, Squirrel' s-tail Coralline. — I was only success- 

 ful in procuring small portions of this very graceful coralline, which is 

 interesting on account of its resemblance to the Oldhamia of the Cam- 

 brian rocks. Like the previous species, it is said to inhabit deep water, 

 and to affix itself to seaweeds and shells, particularly oysters and other 

 large bivalves. 



Antennularia antennina, Lobsters' Horn Coralline, or Sea Beard — 

 This very pretty species is not uncommon on our shores, growing in 

 clusters in sandy localities. In specimens thrown on shore after 

 storms the branchlets are usually rubbed and broken, when it resembles 

 very much the appearance of the lobster's horn or antennae, from which 

 its name is derived. 



Plumularia falcata, Sickle Coralline. — This common but elegant 

 epecies is very abundant on this part of the coast. It occurs in clus- 

 ters of branches, assuming a spiral form, and of varying length. Like 

 the Sea- fir Coralline, it becomes a resting-place for other creatures, such 



