Freshwater-Shells of the Louisiade Archipelago. 201 
pallida circa peripheriam quoque ad suturam ornata; anfract. 6, 
vix convexiusculi, sensim accrescentes, parum nitidi, lineis incre- 
menti tenuibus sculpti, ultimus acute carinatus, antice haud 
descendens, inferne nitens ; umbilicus perspectivus, latus, profun- 
dus; apertura diagonalis, subrhombeo-lunaris; perist. simplex, 
acutum, margine superiore oblique arcuato, inferiore recedente. 
Diam. maj. 17, min. 15, alt. 7 millim. 
Hab. Rossel Island. 
This species approaches 7. papua and T. planorbis and 
some other species in many respects. It may be recognized 
by the dark chestnut-colour and the white thread-like keel 
and suture. 
5. Helix (Chloritis) Leet, Cox. 
Helix Leet, Cox, Proc. Zool. Soc. Lond. 1873, p. 565, pl. xlviii. figs. 5, 
5a; Pfeiffer, Mon. Hel. vol. vii. p. 395. 
Hab. St. Aignan (B. Thomson). 
Dr. Cox does not quote any particular island for his type. 
6. Helix (Chloritis) subcorpulentus. (Pl. XIII. fig. 14.) 
Testa late et profunde umbilicata, subtenuis, globoso-depressa, 
nitida, pallide fuscescens, apicem versus pallidior; anfract. 5, con- 
vexiusculi, subceleriter accrescentes, lineis incrementi ebliquis 
tenuibus sculpti, sutura bene impressa sejuncti; ultimus inflatus, 
antice breviter oblique descendens ; apertura late lunata, parum 
obliqua, intus margaritacea ; perist. livido-rufescens, late expan- 
sum et reflexum, marginibus callo tenuissimo junctis, columellari 
valde dilatato. 
Diam. maj. 40, min. 32, alt. 25 millim. 
Hab. Rossel Island. 
In form this species is very like HZ. Leet; it is, however, 
much larger and differently sculptured; it exhibits no trace 
of the oblique rows of granules occurring in that species, the 
epidermis apparently being non-pilose. 
7. Helix (Geotrochus) Chapmani, Cox. 
Helix Chapmani, Cox, Proc. Linn. Soc. N. 8. Wales, 1880, vol. iv. 
p. 115, pl. xvi. fig. 2. 
Helix (Acavus) coraliolabris, Smith, Ann. & Mag. Nat. Hist. 1887, 
vol. xix. p. 419, pl. xv. fig. 4. 
Hab. Rossel Island (Cox and Thomson). 
I must plead as an excuse for describing this species that 
it is not referred to in the ‘ Zoological Record’ for 1880, upon 
which I relied for species published since the eighth volume 
of Pfeiffer’s Monogr. Helic. 
Ann. & Mag. N. Hist. Ser. 6. Vol. iv. 14 
