the Soiith'Afrlcan Steuogyrina?. '2^)7 



stome thin, siin))U'. Outer lip Imnliy curveil oiitwai>l.s (aii'l 

 tloubtlt'HS would be slightly arched forwards in profile, l>ut 

 the present specimen is imperfect). Columella very slightly 

 concave, margin triangularly rcflcxed over the rima. 



Shell ir)-Gx4 2, aperture I'Gx 1'75, last whorl 7'() mm. 



Hub. Natal ( Wafilbenj). 



The shell contains eggs. It agrees in form will; Krauss's 

 figure, and tliere is no reason to regard it a3 other than 

 typical of K. turriforniis. Much confusion has arisen witii 

 regard to this species, from tiie fact that it was described 

 from shells which, tlmugh almost perhaps themselves mature, 

 had hardly grown to half the proportions which the species is 

 capable of attaining ; Wahlberg's specimens, too, were of a 

 more slender contour than generally occurs — facts wliich, 

 combined with the use of the word " nitido " in the Grii'lnal 

 description, have caused other forms to pass as typical of 

 Krauss's species. 



Now it appears obviously necessary to accej)t the Stockholm 

 cotyj)e as the basis on which to reconstruct the perplexing 

 Natal EuonyincB ; and, after allowing a margin for it to attain 

 full proportion^, remembering that it is a slender form of a 

 species particularly subject to dimorphism, and taking into 

 careful consideration its colour, form, texture, and sculpture, 

 it seems that the two following, hitherto considered distinct 

 species, should be regarded as at most varieties of turriformis. 



Var. acus (Morelet). (PI. VI. fig. 2.) 



1889. S(e>toffi/ra acus, Morelot, Journ. doConcli. xxxvii. p. 8, pi. i. fijr. 0. 

 189G. Sulu/ina f/laucoct/ouea, Melv. & Pons. Ann. & Mag. Kat. Ili-st. 



xviii. p. 317, pi. xvi. fig. 5. 

 1898. SuOuliiia acus and iS. fflattcocyanea, M. &. P. Proc. Mai. Soc. iii. 



p. 179. 

 1898. Opeas acus and 0. glaucocyaneum, Slur. Siidafr. Moll. p. tlO. 

 1906. Ew nymn actiK fiwA ylaucocyanea,V\\ihry,yi.An. of Couch, xviii. 



pp. 40 &, 4."i, pi. x. tigs. 70, 70. 



Ilab. Port Elizabeth. 



A stouter form than the type, often containing 13 whorls 

 and measuring up to 28 mm. in leni^th. 



The type of acus in the British Museum and the only two 

 cotypes that I have seen arc dead and bleached ; but good 

 specimens, agreeing with them in other respects, vary in 

 colour from bluish to yellowish olivaceous, and are somewhat 

 dull, with often little stiiation on the Ujiper whorls. Although 

 apically of the same thickness, they increase into a stouter 

 form than Kraii>s's figure, but in colour, sculpture, silky gloss. 



