IHERTNG : ON TOMIGERUS. 199 



By the collection of Mr. Rocha the number of the known species of 

 Tomigerus is raised from four to seven, that is to say, almost doubled. 

 Mr. Roeha has commenced the malacological exploration of his native 

 State with great ability, and it is to be hoped that he will continue it 

 with success, and also that it will be possible for him to furnish us 

 also with the animals presei-ved in alcohol, in order that we may 

 determine exactly, by anatomical examination, the systematic position 

 of the genera Tomigerus and Anostoma. Of the latter genus he 

 collected A. oetodentaium, P. de Waldh. 



II. NOTES ON TOMIGERUS. 



On this genus we already have a good monograph by Pilsbry, in 

 his excellent Manual of Conchology, ser. ii, Pulmonata, vol. xiv, 

 pp. 105-109, 1902. In considering this genus I have not dealt in 

 detail with the synonymy of the known species. In one respect only 

 it seems to me desirable to propose an arrangement different to that 

 adopted by Pilsbry. With regard to the lamellae of the outer lip, 

 T. gibherulus, with two folds, differs from all the other species, which 

 have only one. Moreover, as its parietal lamellae are also different 

 in form from those in the other species, it is quite evident that 

 T. gibbendm represents a distinct section. As T. gibberulm is the 

 oldest species of the genus it becomes necessary to retain for it the 

 name Tomigerus, s.str., and to form a new subgenus for all the 

 remaining species characterised by a single lamella on the outer lip, 

 for which I propose the name Pilsbryella. 



The following is a key to the natural arrangement of the species of 

 the genus Tomigerus : — 



a. Outer lip with two lamellae ; subgenus Tomifferus, s.str. T. gihberulus. 



h. Outer lip with one lamella only ; subgenus PiUbryella. 



c. Shell brown or corneous, not banded ; spire elevated conic, whorls smooth or 



with slight growth-wrinkles. 

 cc. Shell whitish with brown bands, spii-e shortly conical. 



d. Umbilical sutm-e straight in the middle ; whorls 5, diam. about 12 mm. 



T. turbinates, 

 dd. Umbilical suture short, arcuate, whorls 4-4| ; diam. 5-16-1-5 mm. T. Cmnivgi. 



e. Sui-face smooth, shining, white, ^vith a brown umbiUcal band only. T. Icevis. 

 ee. Surface strongly sculptured, with dark bands. 



/. Back ot the last whorl corrugated. 



ff. Aperture higher than larga ; bands narrow, yellowish. T. clausus. 



gg. Aperture as high as broad ; bands broad, dark. 



h. Spire short, lesser diam. 12 mm. T. corrugatus. 



hh. Spire more elevated, lesser diam. 10 mm. T. Eochai. 



VOL. VI. — MARCH, 1905. 15 



