FRESHWATER GASTROPODA FROM MADAGASCAR. 383 



It is clearly unlike any species described hitherto either from Madagascar 

 or the adjacent regions, Ethiopian or Oriental. At first sight the author was 

 inclined to consider it a Taplirospira, as its generic affinities clearly lie in 

 that direction ; but inasmuch as conchological evidence is alone available, it 

 has seemed better to give it generic rank rather than associate it with a genus 

 of wliich a clearly-defined conception founded upon anatomy has been formed, 

 and to which its resemblances are at the best only general. 



Bathia, n. gen. 



Shell in general form resembling that of Taj^hrospira, but with the apical 

 whorls flattened down to the level of the body-whorl, yielding a perfectly 

 horizontal apical region, and the body-whorl quadrate in outline ; suture 

 deeply channelled ; minutely perforate. 



Bathia madagascariensis, n. sp. 



Shell thin, subpellucid, very pale yellow ; whorls 64, those of the apex 

 depressed and flattened to the level of the body-whorl^ the suture deeply and 

 widely channelled ; sculptured with numerous extremely fine spiral strise, 

 intercepted by lines of growth. Aperture lunate, with a depression above 

 corresponding to' the channelled suture and forming an acute upper angle ; 

 columellar lip very slightly reflected over the umbilicus. When viewed in 

 profile the body-whorl is seen to be very little rounded, horizontal below, 

 and remarkably wide in comparison to its depth. 



Genotype in the British Museum (Zoological Department). 



From woods on limestone, Namoroku (Ambongo). 



Dimensions : alt. 9"75 mm., diam. 19 mm. 



A knowledge of the anatomy of the forms in question can only yield a 

 satisfactory answer ; but it may eventually be found that Ferussac's Helix 

 prcetumida (Seychelles and Mauritius) and Morelet's H. cydaria (Mauritius) 

 fall into the group of this genus and TapArospira. 



Fam. Vaginulid^. 



24. ^Veronicella hovaruei, n. sp.f (v- Appendix). (Plate 35. figs. 4, 5.) 



Locality (see no. 1). ' 



Body elongate, oblong, anterior and posterior ends equally rounded off, 

 rather markedly arched, as much distended below the mantle-edge as above 

 it ; mantle-edge acute. Foot separated from body by a well-marked groove, 

 plicate transversely and, in addition, subdivided by numerous thin ridges 

 which are often themselves subdivided, and the edges of which are frequently 

 frilled, posteriorly rounded, anteriorly squarely truncate, slightly tapering 



t Cf. no. 18. 



