1871.] F. Stoliczka — Notes on terrestrial Mollmca. 159 



vato, postice(vel supra) angulata, labio incrassato, levissime arcuato, 

 supra paululum dilatato, infra angustiore. Diam. maj. 1*2, 

 d. min. TO, alt. testae 1*8 ; alt. ult. anf. ad apert. 08; lat. apert. 

 obliq. 0*5. Operculum animalque non vidi. 



Hob. "Farm caves" prope Moulmein. 



A single specimen of this species was found in the same locality 

 from which G Rawsiana, Bens., was described. It differs from all 

 known Georissa by the absence of spiral striation. The form of 

 the shell is very much the same as that of the previous species. 



Group. HELICACEA. 

 Earn. STREPTAXIDjE. 



Dohrn in 1866, (Maloco-zoologische Bhetter, vol. xiii, p. 129), 

 proposed to unite Streptaais, Ennea and Streptostele into a separate 

 group, for which he suggested the name Streptocionid^:. There 

 does not appear to be any reason, why we should deviate from the 

 generally introduced custom in selecting the family name from that 

 generic one which includes the most typical forms of the group, 

 and this genus is in the present case Streptaxis. The family has 

 already been pointed out by Dr. J. E. Gray, in 1860, (Ann. and 

 Mag. N. H., vi, p. 268), under the name Streptaxid^e. 



The three above noticed genera, (each of which includes several 

 characteristic sections), have the following characters common : 

 a thin hyaline or a thicker alabastrine shell with very thin, deci- 

 duous epidermis, an expanded lip of the aperture, producing in the 

 course of growth a transverse costulation of the whorls, the last of 

 which somewhat deviates from the axis of the spire ; the columella 

 is always thickened and often toothed, or provided with a pro- 

 jecting lamella. 



Dohrn appropriately pointed out the striking relations of the 

 shells of the three genera by quoting the following parallelism : 

 " Streptaxis is helicoid, Ennea pupoid, and Streptostele achatinoid." 



The same author does not describe the animal of Streptostele and 

 its anatomy, probably because they are very similar to those of 

 Streptaxis and Ennea. I have examined several species of the 

 latter two genera, and they all agree in the usual bright, yellow or 

 red colouring, extending over the greater part of the body, or being 



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