496 Mr. G. C. Robson on the 



Umfilianus, gen. no v. 



Pronotum elevated, the front oblique, the posterior process 

 moderately slender, tricarinate, convex at base, well separated 

 from scutellum (which is quite exposed and about as long as 

 broad), its apical area impinging on the tegminal suture and 

 the apex about reaching the inner tegminal margin, lateral 

 angles subprominent ; ocelli almost as far apart from each 

 other as from eyes; face a little concavely declivous; legs 

 simple ; tegmina with four apical areas. 



By the shape and direction of the posterior pronotal pro- 

 cess resembling the genus Indicopleustes, Dist., but altogether 

 removed from the division in which that genus is located by 

 the absence of lateral pronotal processes. 



Umfilianus declivis, sp. n. 



Head and pronotum black; legs black or piceous; body 

 beneath black or piceous, the abdominal segmental margins 

 ochraceous ; tegmina subhyaline, wrinkled, base and sub- 

 costal area obscurely ochraceous, the costal, subcostal, and 

 apical veins black, the interiors of the basal cells also 

 blackish; scutellum about as long as broad, its apex and a 

 small spot at each basal angle greyishly tomentose ; lateral 

 areas of the sternum ochraceously tomentose ; pronotum 

 thickly finely punctate ; other structural characters as in 

 generic diagnosis. 



Long. 6 mm.; breadth lat. pronot. angl. 3 mm. 



Hab. Mashonaland ; Umfili River (G. A. K. Marshall). 



LIX. — On the Extension of the Range of the American 

 Slipper-Limpet on the East Coast of England. By G. C. 

 Robson, B.A. 



(Published by permission of the Trustees of the British Museum.) 



Record of the progress of the American slipper-limpet 

 (Crepidula fornicata) in its invasion of the English coastal 

 waters was brought up to date by Oiton (i) when he described 

 its occurrence at Emsworth, in Hampshire. This gave the 

 animal a range from Mersea Island (Essex) to Hampshire, 

 with a secondary area of distribution (apparently quite dis- 

 connected with the S.E. one) on the Lincolnshire and York- 

 shire coast (discussed by Murie (2)). In the summer of the 



