270 ATYS. 



This is a small, grain-like, horn-colored species, with the apex 

 small and truncate, and the outer lip hardly produced beyond it. 

 (Ad.). 



A. VOLVULINA A. Adams. Unfigured. 



Shell cylindric-ovate, rimate, acuminate and transversely striated 

 at both ends, the strife distant ; white, thin, opaque, shining. Aper- 

 ture narrow ; inner lip obliquely flexuous, thickened in front ; 

 outer lip regularly arcuate. (Ad.). 



Tsu-Sima, Japan, 26 fms. 



AliGida volvulina AD., Ann. Mag. N. H., (3), ix, p. 159. 



A little, white shining species, acuminate at both ends, like a 

 Volvula, but with the sunken spire and twisted outer lip of an Atys.. 

 (Adj. 



A. EXIGUA A. Adams. PI. 28, fig. 24. 



Shell small, elongately oval, posteriorly narrowed, white, shining, 

 longitudinally substriated, under the lens very minutely striated ; 

 aperture narrow, linear, anteriorly dilated ; outer lip posteriorly 

 produced, flexuous; inner lip subcallous. (Ad.). 



Port Lincoln. 



B. (Atys} exigua AD., Thes., p. 589, pi. 125, f. 129. A. exigua 

 Sows., C. Ic., f. 19. 



A. PARVULA A. Adams. PI. 28, fig. 18. 



Shell small, oval, white, shining, transversely entirely striated, 

 stride close together ; outer lip arched, posteriorly produced, ante- 

 riorly dilated ; inner lip slightly tortuous, subtruncated. (Ad.}. 



Port Lincoln. 



B. (Atys) parvula AD., Thes., ii, p. 590, pi. 125, f. 130. A. par- 

 vula Sows., C. Ic., f. 25. 



A. HORDEACEA A. Adams. PI. 28, fig. 25. 



Shell small, oval, white, shining, transversely strongly entirely 

 striated, strire rather wide apart ; outer lip arched, posteriorly pro- 

 duced, anteriorly rounded ; inner lip anteriorly strongly twisted, 

 subtruncated. (Ad.). 



Port Lincoln, Australia. 



B. (Atys) hordeacea AD., Thes., p. 590, pi. 125, f. 131. A. lior- 

 dacea SOVVB., C. Ic., t. 4, f. 20. 



