614 MR. H. ADAMS ON A NEW GEOTROCHUS. [May 7, 



whose request I have named it after Mr. Hargreav'es, a zealous Aus- 

 tralian collector of shells. 



4. Description of a New Species of Geotrochus from the 

 Island of New Britain. By Henry Adams, F.L.S. 



[Eeceived April 10, 1872.] 



(Plate XLII.) 



Upon examining a small collection of shells made by Capt. Fer- 

 guson in New Britain and the Solomon Islands, and forwarded to the 

 Society by Dr. Bennett, of Sydney, I found that the marine shells 

 were all well known, being species which are widely distributed in 

 the Western Pacific ; but among the land-shells there was one from 

 the Island of New Britain, which Dr. Bennett had correctly indicated 

 as new, and which is stated to have formed part of a necklace worn 

 by a native of that island for ornament. I therefore subjoin a 

 description of it, and have named it, at Dr. Bennett's request, G. 

 fergusoni, after Capt. Ferguson, by whom it was obtained. 



Geotrochus fergusoni, sp. nov. (Plate XLII. fig. 14.) 



G. testa imperforata, tenuivscula, conica, oblique Jlexuose plicato- 

 striata, (sub lente) spiraliter crebre striolata, pallide fulva ; 

 spira elevato-conica, apice acutiusculo, sutura Jilo-marginata ; 

 anfr. 7, subplanatis, ultimo non descendente, ad peripheriam 

 acute carinaio, basi subplanato ; apertura diagonali, triangulari- 

 ovata ; perist. late expanso, vix refiexo, albo, marginibus ca/lo 

 tenui junctis, dextro fiexuoso, columellari dec/ivo, subslricto, 

 triangulatim dilatato, cum basali angulum formante. 

 Diam. maj. 18, min. 13, alt. 32 mill. 

 Eab. The Island of New Britain. (Brit. Mus.) 

 This species is nearly allied to G. turris, H. Ad., from the island 

 of Waigiou, in the Malay archipelago, but differs from it in being 

 smaller and thinner, in the basal whorl being acutely keeled instead 

 of being simply angled, and in the absence of umbilicus or perforation. 



DESCRIPTION OF PLATE XLII. 



Fig. 1. Helix lyndi, p. 610. 



2 & 3. philomela, p. 610. 



4 & 5. Thalotia woodsiana, p. 611. 



6. Thracia alciope, p. 611. 



7. Cytherea onoerchi, p. 611. 



8. Venus gladstonensis, p. 612. 



9. Cardium victor, p. 612. 



10. Axincsa fringilla, p. 612. 



11. Pectunculus montrouzieri, p. 613. 



12. Cardita raouli, p. 613. 



13. Valuta hargreamesi, p. 613. 



14. Geotrochus fergusoni, p. 614. 



