■496 Air. G. (!. Robsou on the 



Umfilianus, gen. nov. 



Pronotuni elevateil, the front oblique, the posterior process 

 moderately slender, tricarinate, convex at base, well separated 

 from scutfllum (which is quite exposed and al)out as loni^ as 

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

 the apex about reaciiino; the inner terminal margin, lateral 

 angles subprominent ; ocelli almost as far apart fioui each 

 other as from ej'es ; 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 Zndicopleiistes, Dist., but altogether 

 removed from the division in which that genus is located by 

 the absence of lateral pronotal processes. 



Umfilianus decUvis, sp. n. 



Head and prouotum 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 

 a])ical 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 ocliraceously tomentose ; pronotuni 

 thickly finely ])unctate ; other structural characters as in 

 generic diagnosis. 



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



IJab. 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 Orton (i) when he described 

 its occurrence at Emswoith, in Hampshire. This gave the 

 animal a range from Mtrsea 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 



