DAPHNIADiE. 65 



as his D. sima, but which Straus says is not so, but is his 

 I), macrocopus. The figures which Joblot gives are very 

 indifferent, and it is not easy to say Avhat species they are 

 meant to represent. 



Schosffer, in his Memoir ' Die griinen Arm-Polypen die 

 geschwanzten und ungeschwanzten zackiger Wasserflohe,' 

 1755, describes at great length two or three species, under 

 the name of Geschwanzten zacMger IFasserJIoJi , and Un- 

 fjesclnvanzten zackiger IFasserJIoh, or ivater-jlea luith a tail, 

 and loater-JIea loitJiout a tail; and this memoir is the first 

 in which an attempt is made to distinguish difl^erent 

 species, — the various authors whom I have quoted above, 

 having all, with perhaps the exception of Joblot, described 

 only one and the same. He figures two species, the 

 D. pulex and s'lma, and gives a sketch of the head only of 

 a third, which, lieing provided with a tail, has been quoted 

 by Miiller and Straus as the I). Ion(/ispi?ia. This memoir 

 contains a great deal of very interesting information with 

 regard to these little creatures, and having been pai'tly 

 translated into French by Jurine, at the end of his work 

 on the Monoculi, it has become more available to the 

 naturalist. In his ' Icones Insectorum circa Ratisboniam 

 indiginorum,' 1766, the same author figures the i). j^j^z/^'cZ? 

 under the name of " Branchipus conchiformis primus," 

 and in his ' Elementa Entomologica,' published in the 

 same year, I believe, he again figures it under the name of 

 '' Branchipus conchiformis." 



Poda, in his ' Insecta Mussel Graecensis,' 1761, de- 

 scribes shortly the same species, under Linnasus's name, 

 3/c»^?oc?^/^5 jy?^/e^,andLedermiiller, in his 'Mikroskopischen 

 Gemiiths und Augen-ergotzung,' 1763, gives an in- 

 different figure of a species, which however is easily 

 recognisable as the same. 



Geoffroy, in his 'Hist, abreg. des Insectes,' 1764, 

 gives a good many details of this genus generally, and 

 describes a species under the name of " Perroquet d'eau," 

 which Miiller quotes as his quadrangula, but which Straus, 

 I think more correctly, considers the pidew. 



5 



