192 On a new Shell from the Cape Verd Islands, 



anticus valde declivis vel subtruncatus ; margo veutralis arcuaLus ; 

 cardo normalis. 

 Diam. antero-post. 12, iiinbono-marg. 11 J, crass, 7 mm. 



A thin white shell of simple form and character, more elate 

 than the typical form of Dijdodonta, and witii the whole 

 surface of the valves finely and closely concentrically striated. 



The types of all the species described in this paper are iti 

 the British Museum. 



XXII. — Description of a veiv Shell from the Cope Verd 

 Islands. By G. B. Sowekby, F.L.S. 



Gihhula Murchlandi, sp. n. 



Testa perspective umbilicata, late conoidea, rosaceo-albida, maculis 

 grandibus, minoribus, et minutis, rufo-fuscis ornata ; spira sub- 

 gradata, mediocriter elata, ad apicem acutiuscula ; anfractus 6, 

 ubique spiraliter conferte lirati, primi 3 convexe declives, cseteri 

 angulati, ad angulum plicato-nodulosi, supra angulum leviter 

 planulati, infra levissime convex! ; anfractus ultimus latus, curtus, 

 biseriatim uodosus ; basis convexa, oblique striata, spiraliter 

 valde lirata, liris circ. 10, retrorso complanatis ; umbilicus pro- 

 fundus, mediocriter latus, spiraliter profunde canaliculatus, funi- 

 culo elevato crassiusculo reflexo munitus ; apertura oblique 

 Bubquadrata, intus argentea, Isevis ; labrum acutum ; columella 

 supra arcuata, deinde leviter undulata vel rectiuscula. 



Alt. 14, diam. 16 mm. 



Hah. St. Vincent, Cape Verd Islands. 



At first sight this pretty and interesting shell has much 

 the appearance of a small Gibhula magus, but it is more elate, 

 the body-whorl is more nearly rectangular, the base is much 

 more strongly ridged, and the spiral funicle entering the 

 umbilicus much more elevated. 



This species has some affinity with Gibhula fanuloides, 

 Fischer, which belongs to Adam^j's subgenus Forskalia, but 

 it distinctly connects that group with Trochus magus, Linn., 

 which stands as the type of the genus Gibhula^ showing that 

 the subgenus proposed by H. & A. Adams is not needed. 



The specimens were taken in the above-named locality by 

 Mr. R. Murchland, after whom 1 have pleasure in naming 

 the species. 



The type is in the British Museum. 



