Mr. W. Thompson's Additions to the Fauna of Ireland. 245 



Gu£rin, in his ' Iconographie,' &c. pi. 28. f. 1, represents a spe- 

 cies which he calls by this name ; it is from the Mauritius (Texte 

 Descrip. Crust, p. 24). 



23. Caprella acuminifera, Leach ; Edw. vol. iii. p. 107. pi. 33. 

 f. 21—26. 



I found a few examples of this species living among Corallina offi- 

 cinalis in shallow rock-pools between tide-marks at Springvale, co. 

 Down, in July 1846. 



24. jEgina ? longispina, Kroyer, Voy. Scand. &c. Crust, pi. 19. 

 f.3*. 



A single individual of this very fine, large and spinous form was 

 taken with the two first-noticed Caprellce. My specimen differs only 

 from that represented by Kroyer in having one or two more spines 

 retrally on the body : it is wholly red like his, and has retained this 

 colour in spirits to the present time. Goodsir's Caprella spinosa 

 (Edin. New Phil. Journ. vol. xxxiii. p. 187. pi. 3. f. 1) approaches 

 very near to this species, if it be not the same ; it is described as 

 having " the whole body of a pale white colour.'* Caprella linearis 

 of authors (already recorded as Irish) was taken with this as well as 

 C. lobata and C. tuber culata. 



I have merely identified my Caprellce with the species described, 

 and without any attention being bestowed on the variety of form 

 that the same species may assume. Indeed the only attempt to in- 

 vestigate this subject known to me is that of Kroyer with respect 

 to C. lobata : — see my note under this species. 



Order Isopoda. 



25. Tanais Dulongii, Audouin (sp.) ; Edw. vol. iii. p. 142. 



Two Crustaceans which I found on Alaria esculenta washed ashore 

 at the Giant's Causeway in July 1839, seem so like this species as 

 figured in the great French work on Egypt, that I am disposed (in 

 which Mr. Adam White agrees with me) to consider them the same. 

 They do not exhibit any point of difference, but are not quite per- 

 fect. The second species of Tanais described by M. Edwards is from 

 Naples. M. Kroyer has described three species in the ' Isis,' one of 

 which is from Bahia, and the other two from Madeira. 



26. Jcera aibifrons, Mont, (sp.) ; Leach; Edw. vol. iii. p. 150. 



Common under stones in shallow rock-pools between tide-marks 

 at Bangor, Belfast bay (1834,W. T.), and in Strangford lough, both 

 strictly marine localities — also obtained in the tidal river Lagan at 

 Belfast. Known only hitherto as found on the coast of Great Britain. 



27. Sphceroma Prideauxiana, Leach. 

 An example of this species, taken in a towing-net where the water 



* Described in Kroyer's ' Naturhist. Tidssk.' 1st binde, 5th haefte, 1815, 

 p. 476. 



