LAND- AND FRESHWATER SHELLS. 459 



very convex; sutures slightly margined, deep; last whorl 

 rounded , slightly ascending and enlarged towards the aper- 

 ture. Aperture nearly perpendicular, circular, peristome 

 thick , double ; upper part of the exterior margin angular. 

 Interior of the aperture with a callosity for the operculum. 



Diam. maj. 20, min. 16, alt. 17 mill., apert. 9% mill. 



Locality : near Waingapoe at the Makwai river, Soemba. 



This species, which belongs to the subgenus Pseudocyclopho- 

 rus, I sent to Prof. v. Martens, who declared it to be new, 

 resembling C. guttatus Pfr. in painting, but much less de- 

 pressed , and allied in form to C. amhoinensis, which is 

 much smaller and has the last whorl descending. C. politus 

 Sow., which recently is recorded from Flores by v. Mar- 

 tens , is much more globose. 



30. Helicina exserta v. Martens. 



Martens, in Zool. Ergebnisse einer Reise in Niederl. Ost- 

 Indien durch Dr. M. Weber: Mollusca, p. 220; Taf. 12, 

 fig. 16—19. 



Locality : Baa , Rotti. 



The only specimen, which is relatively higher than those 



described 1. c, I sent for comparison to the author, who 



writes, that on account of the prominent keel, it should 



be considered as H. exserta, and not as H. oxytropis Gray. 



The measurements of these allied species are: 



Hel. oxytropis: diam. maj. 9, alt. 6 — 7 mill. 



)) » : » » 8, » 5 » 



Helic. exserta, from Saleyer: diam. maj. 10 '/j, alt. 6 mill. 



» » , » Rotti : » » 8Vg, » 5^4 » 



31, Helicina sculpta v. Martens, 



var. minor v. Martens. 



Martens, Ostas. Landschn. p. 167; Taf. 4, fig. 17. 

 Locality : Baa , Rotti. 



The lirae are rather distinct, one specimen has at least 

 five lirae above the keel. 



Notes from the Leyden Museum, Vol. XIV. 



