Freshwater- SheJh of the Louisiade Archipelago. 203 



13. Helix [Oeolrochus) coniformis, Fc^russac. 



Helix (Helicostyla) coniformis, Feriissac, Tab. S^^st. Lima^oiis, p. 51 ; 

 Hist. nat. Moll. pi. cviii. ti,i>'. 1 ; Pfeiil'ov, Coucli.-Cab. p. 435, pi. cli. 

 figs. 9, 10 ; Reeve, Conch. Icon. pi. xxiii. fig. 101. 



Hah. New Ireland [Ferussac and others) ; Loiiisiade Archi- 

 pelago (Kohelt). 



This species is quoted by Kobelt in his list of land- and 

 freshwater-shells from the Louisiade Islands (Jahrb. deutscho 

 mal. Gesell. 1880, p. 15) ; but he does not state upon whose 

 authority he has included it. This and the preceding can 

 only be accepted with reserve as Louisiade species. 



14. Ilclix [Geotrochus) Gurgustii, Cox. 



Jleli.r Gurf/ustii, Cox, Proc. Liuu. Soc. N. S. Wales, vol. iv, p. Hi, 

 pi. xvi. fig. 1. 



Uah. Rosscl Island {Cox). 



15. Helicina congener. (PI. XIII. fig. 17.) 



Testa dcprcsse trochiformis, in medio acute cariuata, .sordide albida 

 vel Havesccns, supra carinairi (interdum quoque suturaiB infra) 

 maculis sanguineis oruata ; spira broviter conica, lateribus recti- 

 lincaribus ; anf ract. 5, celeriter crescontcs, supremi 3-4 couvexius- 

 culi, ultimus planiusculus, liris spivalibus conspicuis circiter 8 

 supra angulum, et numerosis gracilioribus infra sculptus, anticc 

 vix dcscendens ; apertura fere horizontalis, triangularis ; peri- 

 stoma album, leviter expansuoi. 



Diam, maj. 19, min, 16, alt. 13 millim. 



Uah. St. Aignan. 



This species closely resembles //. novo-guineensis (Smith, 

 Ann. & Mag. Nat. Hist. 1887, vol. xix. p. 425, pi. xv. 

 figs. 11, 11 a). It has, however, a more elevated and conical 

 spire, with the outlines straight instead of slightly curved, 

 coarser spiral ridges upon the u})per surface, and a different 

 style of coloration. 



16. Helicina^ sp, no v. 



Hah. Rossel Island. 



A single dead shell in worn condition is all that was ob- 

 tained. It is smaller and less sharply keeled than the pre- 

 ceding, apparently of a pale yellowish tint without markings, 

 and finely spirally lirate. 



14^ 



