The British Oceanic Entomostraca. 21 



Evadne Nordmanni, Loven. Baird, British Entom., p. 114, 

 plate xvii., fig. 2. 



This species occurs in considerable numbers, in the warm 

 months of summer and autumn, on the east coast of Britain. 

 I have taken it plentifully off the Durham coast, and have 

 noticed it also in gatherings from the Shetlands, given to me 

 by the Rev. Alfred Merle Norman. Mr. Groodsir took it in the 

 Frith of Forth. It will probably be found to exist in all the 

 British seas. 



Evadne polyphemoides, Leuckart. Leuckart, Weigmann's 

 Archiv., 1859, p. 262. 



First noticed at Nice by Leuckart, and described by him 

 in Weigmann's Archiv., which description is translated into 

 the Annals and Magazine of Natural History (third series, vol. 

 v., p. 445). It is of pretty frequent occurrence off the Durham 

 and Northumberland coasts, and also in the Shetland gather- 

 ings mentioned above. The general appearance of the order 

 Cladocera, to which these two Daphnians belong, will be under- 

 stood by a reference to the figure of Daphnia rotunda, given 

 in the Intellectual Observer, vol. i., p. 448. The two species 

 of Evadne here noticed are sufficiently distinct. E. Nordmanni 

 has mostly a red tint, a large carapace, empty except when 

 bearing ova, and tapering to a sharp point inferiorly, so as to 

 give the animal a triangular outline. E. polyphemoides is 

 smaller, has a very large spherical head separated from the 

 body by a strongly marked neck ; the carapace is very much 

 rounded posteriorly and inferiorly, and has a straight anterior 

 margin rounded at the anteroinferior angle. The abdomen 

 projects anteriorly, and terminates in two strong spines directed 

 downwards, thus giving the animal an appearance not unlike 

 that of Daphnia mucronata. 



Tachtdius brevicornis, Liljeborg. Lilj, Crust, ex. ord. tribus, 

 t. xxii., figs. 12 — 16; t. xxiii., figs. 1, 2, 9 ; t. xxvi., figs. 17, 

 18. 



An entomostracan, referable apparently to this species, I 

 have taken in a salt marsh on the river Wear, near Sunderland. 

 The drawings, made with great care from my specimens, differ 

 in at least one important particular from those of Professor 

 Liljeborg, but from the extreme minuteness of the animal, and 

 consequent difficulty of dissection, it is quite possible that I 

 may have made some mistakes, and having been unable 

 recently to find fresh specimens for further examination, I 

 prefer rather to adopt this supposition than to describe my 

 capture as a new species. It is probable that T. brevicornis 

 may be identical with Canthocamptus minuticornis , Baird ; but 

 Dr. Baird' s figures and descriptions are insufficient to enable 

 us to settle that point satisfactorily. The principal diagnostic 



