264 ENIDiE. 



more diaphanous, the spire is shorter, the body-whorl is more in- 

 flated and the ribs are more distant. The interstices between the 

 costse are closely and minutely spirally striated. The figure in 

 Conch. Ind. shows a more elongated spire, the last whorl is less 

 swollen and the aperture narrower than in typical ahyssinica. 



In size the species varies from 20x12 and 19x11*5 to 

 16 X 10-5 mm. 



23-1. Cerastus fairbanki, Pfeiffer. 



Bulimusfairbanki, Pfeiffer, P. Z. S. 1857, p. 109 ; ibid., Mon. Helic. 



Viv. iv, 1859, p. 410 ; Hanley & Theobald, Conch. Ind. 1870, 



pi. 20, tig. 9. 

 Bidiminus ( Cerastus) scalaris (Ilairburn), von Martens, Die Heli- 



ceen, ed. 2, 1860, p. 232. 

 Buliminus {Cerastus) fairbanki, Nevill, Hand List, i, 1878, p. 133 ; 



Kobelt, Conch.-Cab., Fam. Buliminidae, 1900, p. 677, pi. 102, 



Bulimina {Cerastus) fairbanJii, Pfeiffer & Clessin, Nomeucl. Helic. 



Viv. 1881, p. 280. 

 Cerastus fairbanki, Kobelt & Molleudorft', Nachr. Deuts. Malak. 



Ges. 1903, p. 40. 



Original description : — " T. anguste et compresse umbilicata, 

 ovato-coiiica, tenuuiscula, conferte striata et costis irregulariter 

 distantibus compressis subarcuatis sculpta, sub lente exilissime 

 spiraliter striata, baud nitens, fulvescenti-albida ; spira conica, 

 apice obtusa ; anfr. 6 convexi, ultimus spira vix brevior, juxta 

 umbilicum compressus ; apertura parum obliqua, elliptico-ovalis ; 

 perist. album, marginibus conniventibus dextro mediocriter ex- 

 panso, coiumellari stricto, late patente. 



" Long. 19, diam. 9| mill." (Pfeiffer.) 



Hah. India : Ahmednuggar {FairhanTc). 



This is the best characterized of all the Indian species of 

 Cerastus, on account of the prominent and widely spaced ribs, 

 which are about 2 mm. apart. Five specimens in the Beddome 

 collection, from Alimednuggar, the type-locality, show that two 

 forms may be recognized. Tlie one typical, broadly conoid, the 

 other with more elongated spire and narrower base ; the ribs are 

 neither quite so widely nor so i-egularly spaced, and the form 

 would almost constitute a passage to 0. distans. 



235. Cerastus malabaricus, Pfeiffer. 



BuUmus malabaricus, Pfeiffer, Malak. Blatt. iv, 1857, p. 156 ; ibid., 



]\[oii. Helic. Viv. iv, 1859, p. 411. 

 Bidiminus {Cerastus) deccanensis (Blanford), Nevill, Hand List, i, 



1878, p. 133 (nom. mut.). 

 Bidimina {Cerastus) malabarica, Pfeiffer & Clessiu, Nomencl. Helic. 



Viv. 1881. p. 286. 

 Cerastus malabarims, Kobelt & Mollendorff, Nachr. Deuts. Malak. 



Ges. 1903, p. 41. 



