Notes on certain Terrestrial Mollusca, 163 



Central plate narrow, with one small, obtuse 

 tooth. Laterals with one prominent tooth sup- 

 porting two denticles and a small one at the base. 



The axis of the shell of Macroceramus in all the species which 

 I have examined, with one exception, is simple as in Bulimus, 

 or has a scarcely perceptible twist. In M. amplus Gund. of 

 Cuba, one well-defined lamella revolves on the axis within the 

 lower whorls, becoming partially obsolete in the last. Pfeiffer 

 {Mon. iv. 689) adds to the description of this species the follow- 

 ing note : " Habitu Cylindrellis nonnulliis persimilis, attamen 

 characteribus aperturse a M. Kieneri^ Gossei^ &c., non sepa- 

 randus." In the two species referred to by Pfeiffer there is no 

 internal lamella. Examination of the animal of M. amjolus 

 may show that it belongs to Cylindrella. 



Considering their general characters and forms of aperture, 

 may not Bulimus {Pineria) Beathinus and terebra Poey of 

 Cuba, and B. Yiequensis Pfr. of Yieque and Barbados, be 

 placed, as the two former are by H. and A. Adams, in Macroce- 

 ramus ? 



Helix conspecta, nov. sp. 



Fig. 8. 



Helix conspecta Bland. H, asteriscus Morse. 



T. umbilicata, subdepressa, tenuis, oblique subdistauter costulato-striata, 

 iutervallis sub lente striatulis, fusco-coruea ; spira convexa, apice obtusa, 



