788 PROCEEDINGS OF THE ACADEMY OF [Nov., 



Length 17, diam. 6 mm. 



Caroline Island (C. D. Voy) ; Hawaiian Islands (W. H. Pease). Type 

 No. 58,192, coll. A. N. S., from the first locality mentioned. 



This species is related to C. nesioticum, from which it differs chiefly 

 in the finer sculpture of the later whorls, while the earlier ones have a 

 somewhat different and coarse pattern. C. egenum Gld. is also allied, 

 but differs in sculpture. 



Cerithium nesioticum Pilsbry and Vanatta, n. n. Fig. 4. 



Cerithium jmsillum Nutt. in Jay's Catalogue of Shells. Not C. pusillum 



Pfr., 1840. 

 Cerithium lacteum Kiener, Coq. Viv., p. 58, PI. 7, fig. 3. Not C. ladeum 



Philippi, 1836. 



Shell solid, turreted, acuminate above, the lateral outlines more or less 

 convex. White, usually having a series of reddish-brown spots below 



the suture and some inconspicu- 

 ous, sparse maculation elsewhere. 

 The varices are inconspicuous, 

 low and convex, usually a little 

 whiter than the rest of the sur- 

 face, irregularly disposed, there 

 Fig. 4. C. nesioticum. being two or three on each of the 



whorls of the spire, a single 

 rather prominent wide one on the last whorl opposite the lip, and a swell- 

 ing behind the lip. The sculpture consists of inconspicuous longitudinal 

 folds below the sutures, very variable in strength and length, and numer- 

 ous spaced spiral cords which may be either smooth or weakly granose, 

 three threads usually occupying each of the spaces between the cords, the 

 middle thread often larger. There are generally five to seven of the 

 larger cords on the penultimate whorl. The early whorls have four 

 spiral cords and numerous narrow longitudinal folds, producing a can- 

 cellated pattern. Whorls 11 to 12, the first one smooth, following 

 several whorls convex, the rest but slightly so. The last whorl is some- 

 what flattened above, rounded at and below the periphery, and ter- 

 minates in a very short, slightly recurved anterior canal. The suture 

 is very shallow below, becoming impressed above. Aperture oval, 

 acuminate above, the outer lip strongly arcuate; basal notch deep and 

 open, obliciue. The inner lip is covered with a rather strong callus 

 with raised outer edge, and calloused near the posterior angle of the 

 aperture. 



Length 16.5, diam. 6.7, longest axis of aperture 5 mm. 



Length 15.7, diam. 5.7, longest axis of aperture 5 mm. 



Hawaiian Islands (W. H. Pease) ; Oahu (W. Newcomb) ; northern end 



