Rev. R. T. Lowe on new Maderan Land Shells. 275 



a conjecture is advanced that this species may be the same as the 

 Theridion acuminatum of M. Wider (Museum Senckenbergianum, 

 B. i. p. 232. taf. 15. fig. 11); but well-marked differences in 

 size, structure, and colour plainly show that they are distinct ; 

 and a comparison made between Walckena'era atra and Argus 

 bicuspidatus, as suggested by M. Walckenaer in his ' Hist. Mat. 

 des Insect. Apt/ t. iv. p. 508, has been attended with a similar 

 result. 



XXIII. — Brief Diagnostic Notices of new Maderan Land Shells. 

 By the Rev. R. T. Lowe, M.A. 



[Concluded from p. 120.] 



Pupa, Drap. 

 §. Paludinella, Lowe. 



50. Pupa limn^eana. — P. edentulce, Drap., proxima. Differt 

 testa distincte umbilicata arete substriata, apertura oblique ovali 

 longiore quam lata, f longitudinis sequante. Limnceo minuto, 

 Drap., simillima, Bulimum ventrosum, Fer., quoque refert. 



Hab. in Madera. 



51. Pupa microspora. Differt a P. limnaana testa vix sub- 

 perforata plusquam dimidio minore minuta conico-ovata nee ven- 

 tricosa, apertura transverse ovali depressa latiore quam longa, 

 \ longitudinis sequante. 



Hab. in Madera. Coll. Wollaston. 



§. Ti-uncatellina, Lowe. 



52. Pupa linearis. — P. minutissimce, Hartm. (Vertigini cy- 

 lindricce, Fer.) nimis forsan affinis. Differre videtur anfractuum 

 numero (6—7), et peristomate simplici acuto; sed ab defectu ex- 

 emplorum testae Europsese, comparationem magis exactam insti- 

 tuere nequeo. 



Hab. semifossilis in Madera. 



§. Gastrodon, Lowe. 



53. Pupa fanalensis. — P. anconostomati, Lowe, affinis. Dif- 

 fert forma breviore obesiore ovatiore basi sublatiore, anfractibus 

 convexioribus, sutura impressa, apertura basi rotundata nee an- 

 gulata, plica ventrali validiore, carinaque umbilicali obsoleta. 

 Testa quoque minor subfasciata habitu peculiari proprio. 



(fab. in Madera. Coll. Wollaston et Lowe. 



