BOWELL : RADTJL^ OF BRITISH HELICID3. 209 



ohvoluta. Oblong, pointed, with convex sides ; oblong, doubly 

 angulated ; oval. 



{h) Character of lower corners of basal plate. 



Pisana. Slightly curved ; nearly straight ; conterminous with 



lacinia, heavily striate. 

 hortensis. Long, with feathery striation ; as central ; slightly 



angular. 

 nemoralis. Slightly curved ; slightly curved ; with rounded corner. 

 pomatia. Rounded off ; slightly projecting ; nearly a right angle, 



sub-alate. 

 aspersa. Pointed, incurved ; as central ; very much thinned out. 

 arhustorum. Shape of Vanessa wing-tip ; shape of Platypteryx 



wing-tip ; distinct but blunt points. 

 lapicida. All small, but distinctly incurved. 

 obvoluta. Pointed, slightly incurved ; sharply incurved ; rectangular, 



erect. 



(c) Shape of lower edge of basal plate. 



Pisana. I^ early straight ; straight; scarcely sinuated. 



hortensis. Indented, angle 130°; crenulated, sharply descending 

 towards central ; straight, internally curved. 



nemoralis. Roughly straight, with large indentation ; double curve, 

 out and in ; irregular. 



pomatia. Keaiiy straight, no indentation ; very slightly con- 

 cave, descending towards central; straight, inclined towards 

 central. 



aspersa. Two semicircles side by side ; outside a semicircle, inner 

 half a slanting line ; irregular. 



arhustorum. Fringed ; fringed ; irregular. 



lapicida. Bracket-shaped; slightly curved, inner half crenulated; 

 irregularly convex. 



ohvoluta. All straight. 



[d) Shape of apex. 



Pisana. Rounded, flattened ; as central ; roughly squared, central 



indent and external notch. 

 hortensis. Bifid, rounded; entire, rounded, but tendency to point 



on inner side ; nearly straight, with two lateral indentations. 

 nemoralis. Trifid ; rounded ; irregularly convex. 

 pomatia. Almost straight, slightly irregular sinuations ; as central, 



but inner third curving downwards ; as admedian. 

 aspersa. Yery convex, with additional central convexity ; as central ; 



straighter, but with central protuberance. 

 arhustorum. Like end of a hexagon, but centrally split ; rounded ; 



long and pointed. 

 lapicida. Convex, with central notch ; an obtuse angle ; bifid, 



hardly produced. 

 ohvoluta. Nearly straight, with central notch ; nearly straight ; 



convex, projecting. 



VOL. VIII. APRIL, 1909. 17 



