469 



for a short si)acc, ihcii rallu'r coiutn, until tlu: compressed l)asal margin; coliiinellar side 

 strongh' coiu'ex alon^' the hoiK-wliorl, which is rathc;r ventricose aiul covcrt^d 1)\' a very thin 

 laj-cr of cnaiiu'l; cohniu^Ua sh^htly concave, above, sli^htl)- rc^dected over an nniljihcal sht, 

 whic-li is bordered b\' a very faint rim ; cohnnella slig'htly truncate b('lo\v. 



Ah. trom apex to base of apert. 6, hit. neary 4'/.^; apert. alt. 7, lat. above ^/,, l)eIo\v i '/„ Mill. 



rhe species seems to be allied to the preceding on(\ but differs in colour, being white 

 instead of )-ello\vish; the spiral sculpture, which occupies onl)- the extrcMiiities of body-whoii in 

 tortitosa but extends over more than ■/.. in the new species; above and still more beUnv, tlu; 

 shell is less attenuated, the umbilicus is smaller and less shar|)l\- bordered in the latter s[)ecies, 

 though some specimens seem to be less ventricose than other ones, the least ventricose ones 

 are still more inflated than f. i. A. attemiaia and other allied species. The differences between 

 the specimens in this respect, may be due to age or to the state of preservation, some of 

 them being more or less broken at the peristome ; the measurements are those of the most 

 complete specimen. Nearest, even perhaps too nearly allied, is the recently described A. chelidon 

 (Proc. Mai. Soc, \'^ol. X, p. 253, PI. 11, fig. 16; Oct. 1912), but that species is more slender, 

 and, according to figure, the aperture is more rounded above. 



6. Atys (Alic7ila) cylindrica Helbling. 



Helbling. Abb. Prov. Ges. Bohmen, Vol. IV, p. 122, PI. 2, fig. 30, 31. 



Adams. The.s. Conchyl. Vol. II, p. 585, PI. 125. fig. 114. 



Reeve. Conch. Ic. Vol. XVII, Atys, fig. 7. 



PiLSBRV. Man. of Conch. Vol. XV, p. 265, PI. 33, fig. 60, 61. 



KOBELT. Martini-Chemn. Conch. Cab. Ed. II, VoL I, Bullacea, p. 16, PL 2, fig. 15, 16. 



Stat. 7. Near reef of Batjulmati (Java), Coralreef. 2 Spec. 



Stat. 37. Sailu.s ketjil, Paternoster-islands. 27 M. and less. Coral and coralsand. 20 Spec. 



Stat. 58. Near Seba, Savu, Up to 27 M. Sand. 2 Spec. 



Stat. 133. Lirung, Salibabu-island. Up to 36 M. 7 spec. 



Stat. 184. Near Kampong Kelang, South coast of Manipa-island. 36 M. Coral, sand, i Spec. 



Stat. 240. Banda. 9 — 45 M. Black sand, coral, Lithothamnion. 6 Spec. 



Stat. 313. East of Dangar Besar, Saleh-bay. Up to 36 M. Sand, coral, mud and reef. 66 Spec. 



To this form I have united the more or less angular specimens; none of them reaches 

 the recorded length, scarcely surpassing 20 MilL 



var. elongata A. Adams. 



Adaims. Thes. Conchyl. Vol. II, p. 587, PL 125, fig. 121. 



Reeve. Conch. Ic. Vol. XVII, Atys, fig. 8. 



PiLSBRY. Man. of Conch. Vol. XV, p. 266, PL 33, fig. 2. 



Stat. 279. Rumah-Kuda-bay, Roma-island. 36 M. Mud and sand, i Spec. 



Stat. 301. Pepela-bay, East coast of Rotti-island. 22 M. Mud, coral and Lithothamnion. i Spec. 



This is the more elongated form, without trace of an angle. Both specimens are small. 



7. Atys (AliczilaJ sp. 



Stat. 4. Djangkar (Java). 9 M. Coarse sand, i Spec. 



SIBOGA-EXPEDITIE XLIX'/. 6 I 



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