158 DR BAIRD ON ENTOMOSTRACA. 



Paecilopoda by M. Edwards, though most naturalists, up to his 

 time, liavo arranged them amongst the Arachnides. These in- 

 teresting little animals I have not had an opportunity of examin- 

 ing alive, and as it is still with some hesitation that M. Edwards 

 admits them amongst the Crustacea, I will not introduce their 

 arrangement here. In the mean time, I may state, that an ex- 

 ceedingly valuable paper upon these little creatures, whose " posi- 

 tion in society'* has puzzled naturalists so much, has been pub- 

 lished by Dr Johnston in the Magazine of Zoology and Botany, 

 i., 368, — in which additional reasons are given for arranging them 

 amongst the Crustacea ; and a list of six British species are given, 

 four of which he has found on the coast of Berwickshire. 



CIRRHIPODA. 



The natural affinities of the Cirrhipoda with the Crustacea are 

 now so well understood, that it is no longer doubtful where they 

 ought to be placed. They form, in fact, a portion of the Entomos- 

 traca, their close connection with them having been pointed out by 

 Burmeister and others, and their position assigned to them, as a 

 family of this division, by Mr J. E. Gray, in the Synopsis of the 

 Contents of the British Museum, 1842. As, however, they have 

 generally heretofore been studied by conchologists, and arranged 

 amongst or near to the Mollusca, I will not enter further into 

 their history or arrangement here than to state, that our indefa- 

 tigable member, Dr Johnston, has published in our Transactions, 

 vol. i., p. 63, a list of the species, amounting to six, which he has 

 found on the coasts within the limits of our Club, and to which I 

 must refer you. 



ULVA DEPRACTA. 



In our ** Proceedings" I have stated that this production is a 

 •* true vegetable," which a recent examination, with a better micro- 

 scope than that I used formerly, proves to be incorrect. I pro- 

 cured some specimens tliis summer from Eyemouth, and there is 

 no doubt that they are the spawn of a molluscous animal, pro- 

 bably of one of the Mollusca nudibranchia.— G. J. 



