ATYS. 267 



A. COSTULOSA Pease. Unfigured. 



Shell elongate, subcylindrical, narrowest posteriorly, white, um- 

 bilicate, longitudinally ribbed, crossed at either end by elevated 

 striae, which become more remote towards the middle of the shell 

 and gradually vanish ; outer lip posteriorly strongly twisted and 

 produced ; columella everted at base, flattened and appressed ; 

 aperture narrow. 



Oahu (Pse.). 



A. costulosa PSE., Amer. Journ. Conch, v, p. 73. 



I have met with but a single specimen of this interesting species, 

 the sculpture of which is so distinct that it cannot be confounded 

 with any heretofore described (Pse.). 



A. SEMISTRIATA Pease. PI. 28, fig. 30. 



Shell oval, contracted posteriorly, thin, fragile, pellucid, white, 

 transverse raised lines at both ends ; aperture slightly dilated at the 

 base ; apex perforate (Pse.*). 



Sandwich Is. 



A. semistriata PSE., P. Z. S. 1860, p. 20. SOWB., Conch. Icon. pi. 

 5, f. 27. MARTENS & LANGK., Donum Bism., p. 53, pi. 3, f. 2. 

 COOKE, Ann. Mag. N. H. (5), xvii, p. 131. 



This is identical with A. elirenbergi Issel, a fossil from the Red 

 Sea region, according to Cooke. 



A. ALICULA A. Adams. PI. 33, fig. 74. 



Shell half an inch in length, subcylindrical, thin, the anterior 

 and posterior ends transversely striated, hyaline ; the under part 

 brownish- white; outer lip not reflexed in the middle, with a single 

 fold above, the other end rounded. Animal yellowish ; the head 

 and dilated sides of the foot light green ; head rhomboid, subacute 

 (Ad.). 



Near Suez and Djedda, Red Sea (Mus. Cuming). 



Bulla (Atys) alicula A. AD., Thes. p. 588, pi. 125, f. 126 (not 

 Alicula cylindrica Ehrenb., = Atys cylindrica Helbl.). 



This is not the Alicula cylindrica of Ehrenberg, which von Mar- 

 tens considers to be the species of Helbling, from an examination 

 of the type now in the zoological museum of Berlin. 



A. SUCCISA Ehrenberg. Unfigured. 



Shell oblong ovate, thin, transversely striate at both ends, white; 

 lip uniplicate near its insertion in the concealed spire, the other 



