a 
256 Prize Collection of Fresh-water Crustacea. [Sess. 
13, C. fuscus, Jurine. 
Ravelston Cottage Quarry, May 21, 1900. Common. Easily recog- 
nised by its dark indigo colour, especially in the furca, and by the 
serrate membrane attached to the last joint of the antenne. 
14, C. albidus, Jurine. 
Ravelston Cottage Quarry, June 27, 1901. Very common. Dis- 
tinguished by the dark furea, the dark joints (2nd, 3rd, 9th, and 10th) 
of the antennz, and the 5th foot (which, however, is the same as in 
C. fuscus). There is a conspicuous membrane, which is not serrate, 
attached to the last joint of the antenne. 
15, C. serrulatus, Fischer. 
Granton Quarry, July 26, 1900. Very common everywhere. 
Varies greatly in size and colour. Most easily recognised by the 
serration on the outer margin of the furca, and by the widely 
divergent egg-bags (ovisacs). 
16, 17, C. affinis, G. O. Sars. 
Elf Loch, June 30, 1900. Ponds in Penicuik Grounds, Aug. 25, 
1900. Uncommon. Never lies straight under a cover- glass, but 
always twists its tail round. 
18, C. nanus, G. O. Sars. 
Auchencorth Moss, April 9, 1901. Uncommon. Seems to prefer 
high ground. Best recognised by the 11-jointed antenne, the form of 
the receptacle, and of the 5th foot. It is easy, however, to mistake the 
form of the latter, as the uppermost spine appears at first sight to 
spring from the 5th thoracic segment. We are not aware of any 
published figure of this animal. 
19, 20, C. fimbriatus, Fischer. 
Pond, House-of-Hill Farm, Aug. 27, 1900. Pond near Carswell, 
May 18, 1901. Common. Most easily distinguished by the short — 
very plumose antenne. Only a few specimens were ever obtained — 
by us at one fishing. 
21, C. phaleratus, G. O. Sars. 
Marl pit, Davidson’s Mains, June 7, 1900. Common. Much com- 
pressed from back to front. We have observed that it is in the habit 
of crawling out of the water if the slope of the vessel in which it is — 
placed is not too great. The distinctive features are the very short © 
10-jointed antenne and closely adpressed egg-bags. Only a few speci- — 
mens were found in any single catch. * 
22, C. equoreus, Fischer. Nd 
Rock pool on Vramond Island, July 6, 1901. This is a brackish- 
water species, of which we obtained many specimens in the only brackish- 
water pool we visited. We know of no other such pool in Mid-Lothian. 
Harpacticus. 
23, 24, H. fulvus, Fischer. " 
Rock pool on Cramond Island, July 6, 1901. The pool was swarming — 
with the species. : 
Canthocamptus. 
25, 26, C. staphylinus, Jurine. 
Elf Loch, Sept. 15, 1900. Granton Quarry, Nov. 3, 1900. Very 
common. : 
27, C. northumbricus, Brady. ; , 
Edinburgh, Jan. 6, 1901. Never found by us except on this occasion, 
when we got two specimens. ’ 
28, C. pygmeus, G. O. Sars (Attheyella cryptorum, Brady). + 
Marfield Loch, April 9, 1901. Uncommon. Easily recognised by 
the tail-bristles and the 5th foot. 
