244 Mr. W. Thompson's Additions to the Fauna of Ireland. 



17. Cerapus falcatusj Mont, (sp.), Linn. Trans, vol. ix. t. 5. f. 2. 

 Jassa pelagica, Leach. 



I agree with M. Edwards (vol. iii. p. 61) in considering the forms 

 bearing these two names as one species : Leach looked upon them 

 as different. Both, as distinguished by the form of the claw, are 

 among my specimens, of which a number were dredged in Strangford 

 lough in Oct. 1839 by Mr. Hyndman and myself. Among the roots 

 of a large plant of the tangle (Laminaria digitata) brought me from 

 Donaghadee by Edmund Getty, Esq., in Aug. 1846, were several 

 specimens. 



Devonshire (Mont.) and the Bell Rock (Leach) are the only pub- 

 lished localities I have seen for this species. 



18. Hyperia galba, Mont, (sp.) j Edw. vol. iii. p. 77. 

 Cancer Gammarus galba, Mont. 

 Found in the pouches of Rhizostoma Cuvieri on the Dublin coast 

 in the autumn of 1838 by Mr. Hyndman. 



Only noticed by Montagu as found on the south coast of Devon. 



19. Hyperia Latreillii, Edw. vol. iii. p. 76. 

 Obtained at Youghal by Mr. R. Ball nearly thirty years ago ("about 

 1818") in great numbers in the cavities of a Rhizostoma. This 

 species has not been noticed by any English author, but specimens 

 of Leach's marked "British coast" are in the British Museum. 

 M. Edwards mentions it as found on the coast of France*. 



20. LestrigonuSj sp. 

 An individual of this genus is in the same phial with the last, and 

 was probably obtained from the cavities of the same Rhizostoma with 

 them. It has become so soft in the spirits from incipient decay as 

 barely to admit of specific description. With respect to the genus, I 

 have the opinion of Mr. Bell in addition to my own. Of the two 

 species of this genus described, one is from India, the other from 

 Greenland. (Edw. Hist. Crust, vol. iii. p. 82.) 



Order Loemodipoda. 



21. " Caprella lobata, Mull.," Kroyer, Voy. Scand. et Lapon. 



Crust, pi. 25. f. 3«f- 

 Specimens attached to zoophytes (Sertularia chiefly) dredged from 

 about ten fathoms on sand near Portaferry, Strangford lough, Oct. 

 1839, Mr. Hyndman and W. T. 



22. Caprella tuber culata, Goodsir, Edin. New Phil. Journ. 

 vol. xxxiii. p. 188. pi. 3. f. 6. 



Specimens taken with the last. 



* The species of these Hyperice were determined as above by Mr. Adam 

 White. On my subsequent examination of H. galba insofar as I dare mag- 

 nify the specimen, it seemed to be a Metcecus, Kroyer (which Montagu's 

 may likewise be), but whether M. medusarum I had not the means of deter- 

 mining. The subject must be further examined into. 



t 3 b. presents a very different form, but is considered a variety only. 



