some rare Orustacea. 493 
parasites des Echinodermes”’ *, had described under the name 
of Synatiphilus luteus a Copepod parasite which appears to 
be identical with the form we have recorded from Loch Linnhe; 
and as MM. Canu and Cuenot’s memoir was published in 
1892, Remigulus tridens necessarily becomes a synonym of 
Synatiphilus luteus, 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 the 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 1 (Pl. 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 millim. 
(;4, of an inch) in length. MM. Jules de Guerne and Jules 
Richard, in their revision of the freshwater Calanide, when 
referring to the characteristic form of the last two thoracic 
segments in Diaptomus laciniatus, say :—‘‘ Ce Diaptomus se 
distingue au premier coup d’ceil de tous les autres par la 
forme des deux derniers segments thoraciques.” 
This Copepod occurred very sparingly in the gathering 
from Loch Doon, while another species of the same genus— 
D. 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. ‘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 laciniatus, 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, pl. i. figs. 6 
and 7. 
+ “Ré6yision des Calanides d’eau douce,” by Jules de Guerne and Jules 
Richard, p. 47, separate copy (1887). 
