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nitida, dilute cornea, longitrorsum eoncinnc lirata ; spira turrita, ad 

 apicem obtusa, anfr. 7 convexis, ultimo dimidiam long, testa? ade- 

 quante ; suturii profunda ; apertura angusta, subauriculatii ; colu- 

 mella valde arcuata, involuta, canalem basalem efformante. Incola 

 vivipara. 



Long. 1 ; lat. -g^ poll. Hab. Buried under leaves or in earth, 

 during the dry season, near the sea, Fishtown, Liberia. 



Closely approaches A. Hugeli, Pfeif., but is more slender, more 

 obtuse at apex, more coarsely and regularly striate, and with fewer 

 whorls. In numerous specimens of the animal preserved in spirits, 

 the young are plainly seen in the oviduct, already escaped from the 



egg- 

 Mr. Sowerby has also described a viviparous Bulimus (Malac. 

 Mag.) which Dr. Perkins also collected at Cape Palmas. 



Amnicola ciliata. T. parva, elongata, imperforata, fuseo- 

 viridi; spira acuto-conica, anfr. 6 subangulatis ad angulum serie 

 aculearum recurvarum armatis, ultimo ad peripheriam acute cari- 

 nato ; apertura circulari, labro nigro. 



Long. 1 ; lat. 1 poll. Hab. Deea River, Liberia, on the muddy 

 margins. Dr. Perkins. 



A beautiful little species, grouping with a somewhat larger one 

 from New Zealand, described by me as Melania corolla, and a smaller 

 one from Jamaica, found by Professor Adams, and named by him 

 M. spinifera. A further examination of the apertura and operculum, 

 and also the animal of the New Zealand species, satisfies me that 

 they ought all to come under the genus Amnicola. 



Ampullaria [Pomus] balanoidea. T. solida, imperforata, glo- 

 bosii, decollatii, fusco-obvacea, fasciis numerosis saturatioribus cincta, 

 lineolis undulatis granulosis confertis insculpta ; spira elevata, anfr. 

 superstitibus duobus ventricosis, ad suturam appressis ; apertura 

 rotundato-ovata, labro acuto ; columella arcuata, planulata, croceo 

 tincta, fauce castaneo et albido fasciata ; operculo tenui. 



Diam. | poll. Hab. Grand Cape Mount, Liberia, on rocks in 

 rapid streams. Dr. Perkins. 



A small, very solid species, somewhat similar to A. Storeria, Jay, 

 from the River Amazon. 



Trichotropis [Fossarus] pusillus. T. minuta, rhomboidea, um- 

 bilico semicirculari perforata, albida, striis minutis volventibus cincta ; 

 spira conica, anfr. | convexis, ultimo ventricoso et costis elevatis 

 tribus cincto ; apertura semicirculari ; columella recta, ad planitiem 

 labri acuti trilobati haud assurgente ; umbilico semicirculari. 



Axis, ^ poll. Hab. Crevices of rocks beaten by surf, at Fishtown , 

 Liberia. Dr. Perkins. 



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