1893.] SPECIES or the laitd-mollfscan gEjSttjs altCjEus. 595 



on the swollen pai't of the last whorl, on the apical whorls it is 

 close and fine ; colour ochre ; spire somewhat flattened, apex 

 blunt ; suture deep ; whorls 4, the last moderately swollen ; sharp 

 constriction in front of sutural tube, followed by a strong ridge 

 which is contiguous to the crenulate peristome ; aperture circular, 

 suboblique ; peristome strongly crenulated, double; operculum 

 horny, a large central excavated circular space, surrounded by a pale 

 ring, well marked, rising above to the marginal portion. 



Size: maj. diam. 4"5 ; alt. axis 1"5 mm. 



The nearest known species allied to this is A. crenatus, of the 

 Ivhasi Hills, but the ridge behind the aper'ture in this last lies 

 further back with a short interval ; the peristome is not so 

 strongly crenulate. A. ])lectocheilus of Darjiling is a much 

 smaller form. 



7. Alyc-eus dohertti, n. sp. 



Localiiij. Momeit, Burmah (TF. Doherty, in coll, Aldrich). 



SJiell globosely turbinate, solid, not umbilicated ; sculpture 

 regular distant sharp costulation, closer and fine near the sutural 

 tube; colour stone, with pink apex; spire rather high, conoid, 

 roundetl, apex blunt ; suture impressed, the tube fine, rather long ; 

 whorls 4|, the last swollen, consti-icted with a rounded ridge 

 midway between the sutural tube and the peristome ; aperture 

 expanded, ovate ; peristome double, fine sharp crenulations on the 

 outer margin, rounded on the inner. 



Size : maj. diam. 3"25 ; alt. axis 2*8 mm. 



This is quite a new form, partaking in the constriction and 

 peristome of the characters of A. plectocheilus, crenatus, &c. Momeit 

 lies X.N.E. of Mandalay, about midway between it and Bhamo 

 and further east than Mogok in the Ruby Mine District. 



8. Altceus busbti, n. sp. 



Locality. Nicobars (G. Bushy, in coll. Dr. Hungerford). 



Shell turbinate, of tumid form, widely umbilicated ; sculpture 

 smooth, fine ribbing near the sutural tube and still finer below ; 

 colour pale ochi'aceous ; spire moderately high, apex blunt ; suture 

 deep, the sutural tube short and thick ; whorls 4|, very rounded, 

 the last much swollen and compressed within the umbilical cavity, 

 constriction simple, slight ; aperture oblique circular ; peristome 

 double, the outer lip flat and expanding at right-angles to the 

 whorl. 



Size : maj. diam. 7'o ; alt. axis 3"0 mm. 



This is the largest species as yet known from the IVicobar 

 Islands. I name it after its discoverer, who gave the specimen to 

 Dr. Hungerford ; its exact locality has not been recorded. 



