130 BRITISH HYDRACHNIDiE. 



the Royal Microscopical Society^ 1871, p. 184, and The Annals of 

 Natural History, Jan., 1871, p. 55, have a few observations on a 

 species of Atax parasitic upon fresh-water mussels by Emil Bessels 

 which are worth reading, and are very interesting. Science Gossip, 

 1883, p. 180, has a short article on Atax by Dr. George, in which 

 he figures and describes the swimming hairs so peculiar to this 

 genus. This completes the list of English papers so far as my own 

 knowledge goes, but on the Continent Atax has received some 

 considerable amount of notice. Van Beneden, in 1848, published 

 a paper on the " Development of Atax ypsilophora,^' which has 

 received a great deal of attention, and justly so, for it is well 

 written and well illustrated, and was the result of several years' 

 devotion to the study of these interesting creatures. Koenike also 

 has a paper on Atax in Abha?idl. d. ?iaturwiss. Verei?i zu Bremen, 

 1882, without figures. Besides the above, the species we are 

 about to consider has received a great many notices, and has been 

 recorded a great number of times, as will be seen by the following 

 list; but regardless of the frequency with which it has been 

 recorded, we must add one more paper to the list : — 



Atax crassipes (Miill.). Bibliography and synonyms : 



1776. — Hydrachfta crassipes, Miiller, Zool. Dan. Prodr., p. 189, 



No. 2254. 

 1 78 1. — Hydrachna crassipes, Miiller, Hydrachfice, p. 4r, PI. IV., 



Figs. I — 2. 

 1793. — Tro7nbidium crassipes,^. C. Fabricius, Ent. Syst., II., p. 400. 

 1805. — Atax crassipes, J. C. Fabricius, Sy sterna Antliatorum, p. 366. 

 1835-41. — Atax crassipes, C. L. Koch, Deutschlands Crust., etc., 



p. 7, Fig. 2 1. 



Atax truncatus, as above, p. 7, Fig. 22. 



Atax ahbidus, as above, p. 7, Fig. 23. 



Atax truncatellus, as above, p. 37, Fig. 17. 

 1842. — Atax crassipes, C. L Koch, Uebersicht des Arachniden- 



sy stems, S. 7, Tab. i. Fig. i. 

 1854. — Atax crassipes, Bruzelius, Beskr. 6. Hydrachn. som. Farek., 



p. 8, Figs. 1—4. 

 1868. — Atax crassipes, Claparbde, Zeitschr.f. Wissenschaftl. Zool. 



Bd. XVII., p. 471. 



