Freshwater-Shells of the Louisiade Archipelago. 203 
13. Helix (Geotrochus) contformis, Férussac. 
Helix (Helicostyla) coniformis, Férussac, Tab. Syst. Limagons, p. 51 ; 
Hist. nat. Moll. pl. eviii. fig. 1; Pfeiffer, Conch.-Cab. p. 435, pl. cli. 
figs. 9, 10; Reeve, Conch. Icon. pl. xxiii. fig. 101. 
Hab. New Ireland (érussac and others) ; Louisiade Archi- 
pelago (Kobelt). 
This species is quoted by Kobelt in his list of land- and 
freshwater-shells from the Louisiade Islands (Jahrb. deutsche 
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. Helix (Geotrochus) Gurgustit, Cox. 
Telia Gurgustit, Cox, Proc. Linn. Soc. N. 8. Wales, vol. iv. p. 114, 
pl. xvi. fig. 1. 
Hab. Rossel Island (Coz). 
15. Helicina congener. (Pl. XIII. fig. 17.) 
Testa depresse trochiformis, in medio acute carinata, sordide albida 
vel flavescens, supra carinam (interdum quoque suturam infra) 
maculis sanguineis ornata; spira breviter conica, lateribus recti- 
linearibus ; anfract. 5, celeriter crescentes, supremi 3—4 convexius- 
culi, ultimus planiusculus, liris spiralibus conspicuis circiter 8 
supra angulum, et numerosis gracilioribus infra sculptus, antice 
vix descendens; apertura fere horizontalis, triangularis; peri- 
stoma album, leviter expansum. 
Diam. maj. 19, min. 16, alt. 13 millim. 
Hab. St. Aignan. 
This species closely resembles HZ. novo-guineensts (Smith, 
Ann. & Mag. Nat. Hist. 1887, vol. xix. p. 425, pl. 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 upper surface, and a different 
style of coloration. 
16. Helicina, sp. nov. 
Hab. 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. 
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