NO. 1858. XEW M0LLU8KS OF THE GENUS NODULUS—BART&CH. 291 



base gently rounded, marked like the spire. Aperture very oblique, 

 subcircular; posterior angle obtuse; outer lip reflected at the edge; 

 inner lip moderately long, reflected; parietal wall covered with a thick 

 callus, which is also reflected, but free at the edge, thus giving the 

 entire aperture a dished appearance. 



The tyi3e (Cat. No. 111369, U.S.N.M.) comes from Coronado 

 Island, San Diego, California. It has 5 post-nuclear whorls and 

 measures : Length 1.9 mm. , diameter of the penultimate whorl 0.6 mm. 



Named for Prof. F. W. Kelsey, of San Diego, Cahfornia. 



NODULUS KYSKENSIS, new species. 



Shell elongate-ovate, thin, translucent, yellow. Nuclear whorls 

 one and one-quarter, smooth, well rounded, scarcely differentiated 

 from the succeeding turns. Post-nuclear whorls appres- 

 sed at the summit, with a somewhat concavely sloping 

 shoulder which extends over the posterior third between 

 the sutures. Entire surface marked by numerous fine 

 lines of growth only, surface apparently covered with 

 a thin epidermis which has the finely cracked appearance 

 frec{uently seen on a surface covered with varnish. Su- 

 ture strongly constricted. Periphery and the rather 

 short base of the last whorl well rounded. Aperture 

 very large, very broadly oval, decidedly oblique ; pos- 

 terior angle obtuse; outer lip slightly expanded; inner '*^kyskensis!^^^ 

 lip decidedly curved and reflected ; parietal wall covered 

 with a thick callus which is disjunct at the edge and renders the 

 peritreme complete. 



The type (Cat. No. 161105, U.S.N.M.) has four post-nuclear whorls 

 and measures: Length 2.3 mm., diameter 1.1 mm. It was collected 

 at Kyska Harbor, Aleutian Islands, Alaska, by Doctor Dall. Seven- 

 teen additional specimens, also entered as Cat. No. 161105, U.S.N.M., 

 w^re collected on the beach and on sponges at low water mark by 

 Doctor Dall on the same island. Four more (Cat. No. 213457, 

 U.S.N.M.) come from Atka Island, Alaska. 



This shell has been referred to by various authors as Rissoa saxa- 

 tilis Moller. It differs from that form in having the whorls slopingly 

 shouldered near the summit and in lacking the fine spiral striations. 



