GEOMITRA. 241 



Lwe. Irus LWE., Ann. Mag., Feb., 1862, p. 114 (laciniosa, 

 squalida, depauperata)', P. Z. S., p. 174, type H. depauperata Lwe. 

 Not Irus Oken, Naturgeschichte fiir Schulen, p. 647 (1821). 



Shell perforated, globose-depressed, with conoidal or flattened 

 spire, the whorls about 5, rounded, sutures deep; surface smoothish 

 or coarsely wrinkled, sometimes bearing recurved cuticular scales. 

 Aperture slightly oblique, round or oval, the parietal lip continu- 

 ous and adnate. Type G. obtecta, pi. 68, fig. 13. 



As the name Irus is preoccupied, its species may be merged in 

 Spirorbula, which offers no very marked difference. 

 G. obtecta Lwe., iv, 35. G. depauperata Lwe., iv, 36. 



G. latens Lwe., iv, 35. G. latinea Paiva, iv, 36. 



G. squalida Lwe., iv, 35. G. laciniosa Lwe., iv, 36. 



Subgenus ACTINELLA Lowe, 1852. 



Actinella LWE., Ann. Mag. N. H. (2), ix, Feb., 1852, p. 118, pro- 

 posed for stellaris lentiginosa, arcta; P. Z. S., 1854, p. 180, type H. 

 lentiginosa Lwe. Rimula LOWE, t. c., p. 118, for obserata andfausta; 

 P. Z. S., 1854, p. 181, not of Defrance, 1827 (see Man. Conch. [I], 

 xii, p. 269)-}- Callina LWE., t. c., p. 183, sole species H. rotula Lwe. 



Shell brownish or variegated, depressed-globose, the periphery 

 subangular or keeled, umbilicus narrow or closed. Surface scaly, 

 striate or rather sparsely granulated. Aperture oblique, peristome 

 expanded and thickened within, its margins not much converging, 

 parietal callus usually rather slight. Type G. lentiginosa Lwe., pi. 

 68, figs. 4, 5 (see also pi. 68, fig. 7, G. [Callina] faustd). 



Distribution, mainly Madeira. 



(Perforate or umbilicate, the callous of basal lip not toothed, 



Actinella.) 



G. lentiginosa Lwe., iv, 38. G. stellaris Lwe., iv, 38. 



G. actinophora Lwe., iv, 40. G. arcta Lwe., iv, 38. 



v. descendens Woll. G. arridens Lwe., iv, 40. 



(Imperforate or nearly so, compact, granulate, basal callus strong 



and truncate, Callina.} 



G. arcinella Lwe., G. obserata Lwe., iv, 40. 



G. fausta Lwe., iv, 40. v. bipartita Woll.. iv, 40. 



v. robusta Woll. G. capsella Lwe., iv, 41. 



G. rotula Lowe, iv, 46. 

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