26 ON ENTOMOSTRACA COLLECTED IN THE SOLWAX DlSTMCT 



the length of the entire body : there are altogether nine seg- 

 ments, exclusive of the caudal laminae, but the sixth (first 

 abdominal) segment has an imperfect transverse division; the 

 posterior margins of the somites are finely pectinated. Caudal 

 laminae short, subquadrangular, not much longer than broad, 

 about half as long as the last abdominal somite ; apex bearing 

 one long seta (about one-fourth the length of the body) and two 

 minute setae ; outer margin with two setae, about equal in length 

 to the two smaller apical ones, and numerous minute cilia, in- 

 ternal margin smooth : no distinct anal operculum. Length 

 (exclusive of tail setae) 0.85 mm. 



Male. — Like the female in size and general appearance, except 

 that the abdomen consists of five somites and that the margins 

 of thoracic somites are less distinctly pectinated. Antennules 

 geniculated, the first three nearly equal in length but succes- 

 sively decreasing in width, fourth very much enlarged and 

 semicircular, the remaining three much smaller. First pair of 

 swimming feet like those of the female; second pair similar 

 excepting that the principal apical setae are much larger ; inner 

 branch of third foot somewhat conical in shape, with a dilated 

 base, which is separated from the apical portion by a rather deep 

 constriction, the apex furcate so as to form two lash-like pro- 

 cesses ; inner branch of the fourth foot very short, with two 

 minute setae on the inner margin, and at the apex two setae, 

 the outermost of which is simple, the other rather shorter and 

 stouter, and having its inner margin, produced into three small 

 nodular or moniliform prominences. Pifth foot obsolete, con- 

 sisting of only a few setae. 



Hahitat. — Taken in June, 1894, in a small pool a little above 

 high-water mark near Eockcliffe, Kirkcudbrightshire, on the 

 eastern side of the Estuary of the Urr, between the village and 

 the Castle Point. The pool contained fresh- water vegetation but 

 would be subject to influx of sea-water at times of unusually 

 high tide : doubtless it would also be rendered slightly saline by 

 spray during storms. 



Amongst other Microzoa taken in the same pool were a Col- 

 lembolid {Isotoma oquatilis, Miiller), one km^hvoo^ {Gammarus 



