42 A MONOGRAPH OF 



decayed timber. At the latter locality the brown speci 

 mens were got. 



This is a very interesting nautiliform, bi-concave species ; it is one 

 of the most peculiar of our smaller forms. It resembles, in miniature, 

 Diplomphakis Magei (Lamlert) from New Caledonia. Pure white 

 specimens are quite as often found as the brown. The riblets and 

 interstices are obsoletely, transversely striate under the microscope, and 

 the nucleus flat, smooth, and shining. 



^Q. — Helix ( ) subangulata — Pfr. 



Pro. Zool. Soc, 1854, p. 53. 



Mon. Hel. Viv., vol. iv. 



Reeve, Cone. Icon., sp. 1301. 



Cox, Mon., 1863, p. 12, pi. ix., fig. 6. 



Legrand, Col. for Mon., sp. 13. 



Shell umbilicated, convexly-depressed, rather solid, finely striated, 

 scarcely shining, waxy, ornamented with a narrow chestnut band near 

 the suture and two broader ones (three in Reeve's fig.) beneath the peri- 

 phery ; spire short, convex, obtuse ; whorls 4^^, slightly convex, 

 gradually increasing, last not descending ; periphery slightly angled, base 

 rather flat ; aperture oblique, of a rounded-squarish form ; peristome 

 simple, straight, with margin nearly parallel, the columellar beiDg 

 expanded near the umbilicus, which is of a moderate size and ojDen. 



Diameter, greatest 0*64, least 0*50 ; height, 0*45 of an inch. 



Habitat. — Yan Diemen's Land (FfeifferJ. 



This shell is quite unknown to Tasmanian or Australian collectors, 

 and so far as present investigation has gone nothing bearing even a 

 remote resemblance to it has been discovered in this island, although it 

 would be rash or premature to definitely state that it does not exist, for 

 there are still many parts as yet quite unexplored, or at least un visited 

 by recent investigators. In some respects it has a remote resemblance 

 to the young stage of the common and generally dispersed Bulimus 

 Bufresni^ although I do not for a moment sui^jDOse it to be an immature 

 specimen of that species. It may, however, yet be re-discovered, 

 although I have great doubts, and rather think that some error has been 

 made in the habitat as recorded by Pfeiffer. 



In markings it has some resemblance to H. conscendens (Cox) from 

 New South Wales, and to H. fucata (Pfr.) from Queensland, but both 

 these species are imperforate and globosely-conical. 



