394 CRUSTACEA. 



coloured " spots. Each segment of the body m every specimen examined 

 (about thirty in number) is marked with a round black spot, whence, in 

 some, arborescent arms branch off; in others there is no arborescent 

 appearance, but the segment is dotted regularly over with extremely 

 minute points. 



M. vulgaris, J. V. Thomp. 



On the occasion mentioned my attention was first directed by remarking 

 among those captured, individuals v,-anting the black spot on the segments 

 of the body, when, singling out three of these, they proved to be of this 

 species — all the others were 31. Chamcelcon. The segments hoAvever ex- 

 hibit an arborescent veining, though wanting the black central sjDot. 

 These specimens are one inch in length, or one-fifth less than the largest 

 M. CJiamaleon taken with them. If the proportion of the one species to 

 the other in the myriads seen were as in those taken, the numbers of M. 

 vtih/aris to the other were but as one to ten. Some of these {M. vulgaris) 

 produced young in the phial, like those represented by Miiller in the 

 Zoologia I)anica, pi. 66, and by Kroyer in the Voyages Scandin. et 

 Lapon. Crustaces, pi. 9. 



BaUyhonw, Belfast Bmj, Jidy 4, 1846. — From the rocks at the entrance 

 of this bay I captured in pure sea-water a number of the 3Iysis of various 

 sizes, all of which proved to be 31. Chamcfleon. The extraordinary differ- 

 ence in colour of these specimens, all taken together within the space of 

 a few yards, well justified the specific name. They were brown, green, 

 pink, red, and hyaline, some as transparent in colour as the water itself; 

 a few displayed a whitish longitudinal stripe down the back. With the 

 view to a more particular examination of the colours at home, they were 

 jjlaced in a phial of sea-watei", but were all dead on my arrival there a few 

 hours afterwards. Of the many species of the more minute forms of 

 Crustacea which I have preserved in spu'its, the 3Iysid(e were always 

 among the first to become soft and to decay. The specimens under con- 

 sideration, when examined in sjjirits, exhibited on each segment of the 

 body a black spot, whence more or less of an arborescent appearance was 

 manifest. 



31. Chamceleon has occurred to me much more frequently as well as in 

 greater numbers on the Irish coast than 31. mdyaris. In very shallow 

 pools between tide-marks at liahinch (Co. Clare) the latter was procured 

 by Professor E. Forbes and myself. It frequents the tidal river Lagan 

 at Belfast. 



Germs SCORPIONUEA. 

 <S'. vulgaris, Thomp., J. V. 

 South of Ireland. 



S. lonyicornis, Thomp., J. V. 

 South of Ireland. 



S. maxima, Thomp., J. V. 

 South of Ireland. 



Gemis Cynthia. 

 C. Flemingii, H. Goodsir. 

 Among some of the more minute Crustacea taken at Strangford Lough 

 in May, 1840, by Mr. R. Patterson, is a Cynthia, but hardly sufficiently 



