Marine Shells from Henderson Island. 413 



Island far exceed those given by Broderip and other authors. 

 It is 10 ram. long, G in diameter, and 2*5 in height. 



Natica dillwynii, Payraudeau. 



Hab. Mediterranean, St. Helena, West Indies, Mauritius, 

 and South Pacific (see Smith, Proc. Zool. Soc. 1890, p. 270). 



In the Henderson Island specimens the reddish-brown 

 articulations on the two white zones on the body-whorl are 

 not so distinctly arrow-head-shaped, and the markings on 

 the white base around the umbilicus consist of a series of 

 small dots instead of the conspicuous curved brown lines 

 which occur in Mediterranean and West-Indian specimens. 

 I have not seen the operculum of Mauritian or South-Pacific 

 examples. 



Descriptions of New Species. 



Engina fuscolineata. (PI. IX. fig. 1.) 



Testa parva, ovato-fusiformis, alba, inter costas nodulosas fuseo 

 lineata ; anfractus normales sex plauiusculi, paulo infra suturam 

 sulco constricti, oblique costulati, transversim striati, costulis 

 nodulosis, in anfractu ultimo flexuosis, basim versus minus nodu- 

 losis ; apertura angusta, intus flavescens ; labrum incrassatum, 

 album, denticulis circiter sex intus armatum, ad marginem fusco 

 notatum ; columella denticulis externis ad quinquo et plicis vel 

 denticulis internis duobus medianis instructa, callo tenui niteute 

 definite induta ; canalis anterior obliquus, leviter recurvus. 



Longit. 9, diam. 4 mm. 



This species is well characterized by the style of the 

 markings, the fine dark brown lines between the nodulous 

 costse being very striking. The oblique costoe on the upper 

 whorls have three or four tubercles on each, these being 

 caused by transverse fine sulci or impressed lines cutting 

 across the ribs. The body-whorl is somewhat contracted 

 below the middle and has about ten nodules on the rib-. 

 The anterior end is crossed by three or four conspicuous 

 grooves, and the ridges between them are scarcely affected 

 by the longitudinal costse, and consequently appear almost 

 non-nodulous. On the labrum the most posterior tubercle 

 is somewhat distant from the next, so that a slight sinus is 

 formed. The uppermost or hindmost denticle on the colu- 

 mella is a little within and near the hindmost one on the 

 labrum. The four other denticles upon the outer edge corre- 

 spond to the terminations of the oblique ridges upon the 

 lower portion of the whorl. The two internal denticles are 



