26 A MONOGRAPH OF 



38. — Helix ( ) cuRAgo^ — Brazier. 



Pro. Zool. Soc, 1870. 



Legrand's Col. for Mon., species 48. 



H. Raiasgatensis — Cox. 



Legrand's Col. for Mon., species 33, pi. i., fig. 13. 



Shell rather widely iimbilicated, depressed, tliin, very closely and 

 finely plicately ribbed, interstices smooth, white, not shining ; spire 

 depressed ; suture rather deep ; whorls 4|, rapidly increasing, convex, 

 last large, rounded, not descending in front, base ribbed, same as upper 

 surface ; umbilicus perspective ; aperture oblique, roundly-lunate ; 

 peristome simple, thin, acute ; coluraellar margin slightly reflected. 



Diameter, greatest 0*25, least 0*20 ; height, 0-13 of an inch. 



Hahitat. — Mount Wellington, Kecherche Bay, Mount Nelson (?). 



A very distinct species, easily distinguished by its small sunken 

 spire, dull appearance, and somewhat distant plicate riblets. It varies 

 in colour from reddish-horn to white. It is represented in the northern 

 portion of the island by H. Mathinn^ (mihi), to which it is closely allied 

 but yet distinct, as may be seen by the description. 



39.— Helix ( ) Mathinn^. N. Sp. 



Shell steeply, somewhat narrowly, umbilicated ; depressed, covered 

 with very prominent ribs, which are irregularly plicately fringed, widely 

 apart, and often faintly irregular in deposition and becoming almost 

 obsolete at the apex ; shining, horny, almost waxy appearance ; 

 interstices and ribs again striated parallel with the ribs, and also faintly 

 transversely, giving an irregular crenated appearance to the base of the 

 ribs ; spire depressed ; suture deep ; whorls 4 to 4J, rapidly increasing, 

 convex, last rounded, not descending in front, base sculptured as upper 

 surface and descending into the deep umbilicus, which is rounded at the 

 bottom , intercostal spaces of base cons^Dicuously decussate ; aperture 

 roundly-lunate ; peristome acute ', columellar margin not reflected. 



Diameter, greatest 6J, least 5| ; height 2| mil. 



Sahitat. — Near First Basin, Launceston. 



The most beautifully sculptured of our known Helices, and one that 

 cannot well be mistaken for any other. The nearest to it is H. 

 CiiragocB (Brazier), but it difiers from that species by its more elaborate 

 ornamentation. IJf) to the present I have collected it only in a gully 

 ai the locality mentioned, where it is very rare, hiding under large 

 stones in a thick jungle. 



