308 Analyses of Boohs. 



shell smooth, shining ; posterior legs terminated by one long claw ; 

 anterior legs furnished with a pencil of long hairs from penultimate 

 joint, and terminated by several strong hairs or setse ; seta? of antennae 

 numerous. 



7. C. elongaia. Nova species. Pool on Beaumont Water at 

 Yetholm. Shell much broader at anterior than posterior extremity, 

 which is narrow and much elongated ; elevated on upper margin 

 towards anterior extremity, and situated on under margin more to- 

 wards the posterior extremity ; white ; transparent ; hairy ; seta? 

 of antennae five or six ; anterior feet of about three articulations, 

 each articulation furnished with setse ; posterior legs denticulated. 



8. C. reptans. Nova species. Yetholm Loch. Shell long almost 

 elliptical, nearly plane on upper, and slightly hollowed out or sinu- 

 ated on under margin, rather ventricose, hairy ; densely ciliated on 

 anterior extremity ; the cilise on posterior extremity fewer but much 

 longer, of a light colour with dark green markings, which appear to 

 be rather irregular ; both extremities have a large broad green spot, 

 which sends out processes as it were towards the centre of the shell; 

 antenna? and feet short in comparison to the size of shell. I have 

 never seen this species swimming about in the vessel in which I 

 have kept it, but always creeping on the bottom. 



9. C. Westwoodu. Nova species. Yetholm Loch. Shell much 

 elevated and rounded on upper margin, and sinuated on lower, 

 broader at anterior extremity, green-coloured, semi-transparent, 

 densely covered with pretty long hairs all over ; second last joint 

 of anterior feet furnished with a pencil of long hairs; posterior 

 feet furnished with a short seta at each articulation, and with a 

 long curved claw at extremities ; antenna? indistinctly articulated. 



10. C. tristriata. Nova species. Pond at little Swinton. Shell 

 ovate, ventricose, anterior extremity a little narrower than posterior, 

 upper margin rounded, lower sinuated slightly, green, hairy ; on the 

 upper margin, nearly in middle of length of shell, there is a dark 

 mark, from which run to posterior extremity three dark green 

 streaks, the centre one of which is the most distinct and the darkest 

 coloured ; anterior extremity of a rather darker green than the 

 rest of shell. Between the centre and most anterior of the streaks 

 are five or six small lucid spots. 



11. C.hispida. Nova species. Pool on Beaumont Water at Yetholm. 

 Shell almost elliptical ; the anterior extremity being a little broader 

 than posterior ; rather ventricose ; very roughly and densely hairy ; of 

 a brown colour all over, with one or two dark brown marks running 

 across centre of shell, in the anterior of which are four or five 

 translucent spots ; both extremities of a darker colour than other 

 parts of shell. The whole shell is very hispid, spines rather than 

 hairs covering the shell ; antenna; slender ; seta? seldom much 

 divaricated, about twelve in number. The markings of shell are 

 not in all specimens very distinct. 



12. C. lucens. Nova species. Yetholm Loch and pools on Beau- 

 mont Water. Shell white, shining, without spot ; almost opaque ; 

 ventricose ; elevated on upper margin towards posterior extremity, and 

 reniform underneath ; anterior extremity narrower and flatter than 

 posterior which is arched and broad, the inferior angle being, however, 



