some rare Crustacea. 493 



parasites dcs Echinodermes " *, had described under the name 

 of Synaliphilus luteus a Copepod parasite which appears to 

 be identical with tlie form we have recorded from Loch Linnlie; 

 and as ^IM. Canu and Cuenot's memoir was published in 

 1892, luvu'gulus tridens necessarily becomes a synonym of 

 SynatiphUiis lateuSj Canu and Cuenot. 



Diaptomus laciniatus, Lilljeborg. (PI. XII. fig. 1.) 



A freshwater Copepod from Loch Doon, Ayrshire, new to 

 Britain. 



This species of Diaptomus is readily distinguished from 

 any other member of tlie genus in the British fauna by the 

 peculiar form of the last two thoracic segments in the female, 

 as well as by the difference in the structure of the fifth pair 

 of thoracic feet in both sexes. 



Figure I (PI. XII.) represents a female specimen seen from 

 above, and shows the peculiar form of the last two thoracic 

 segments referred to ; this specimen measured 1"8 milUm. 

 (jij of an inch) in length. MM. Jules de Guerne and Jules 

 Richard, in their revision of the freshwater Calanidai, when 

 referring to tlie characteristic form of the last two thoracic 

 segments in Diaptomus I'.iciniatus, say : — " Ce Diaptomus se 

 distingue au premier coup d'ceil de tons les autres par la 

 forme des deux derniers segments thoraciques." 



This Copepod occurred very sparingly in the gathering 

 from Loch Doon, while another S])ecies of the same genus — 

 1). gracilis, G. O. Sars — was of frequent occurrence. There 

 does not appear to be any previous British record of D. lacini- 

 atus, but on the continent it has been found at Kola in 

 Russian Lapland and in the vicinity of Bergen in Norway. 

 Prof. Cleve (of Upsala, Sweden) has also collected it in 

 abundance in the Lake of Geneva t« The altitude of Loch 

 Doon is between 600 and 700 feet above the sea. 



Lathonura rectirostris, Lilljeborg. 



From Loch Doon, Ayrshire ; new to Scotland. 



In the gathering of Entomostraca from Loch Doon there 

 were, besides Diaptomus ladniatus, already referred to, 

 several other species of more or less interest, most of which 

 have, however, been recorded from other parts of Scotland ; 



* Revue Biol, du Nord de la France (Oct. 1892), p. 19, pi. i. figs. 6 



and?. 



t "RtSvision des Calonides d'eau douce," by Jules de Guerne aod Jules 

 Richard, p. 47, sepai-ate copy (1887). 



