32 ENJDODONTA. 



Animal small, the mantle rather posterior, tail not produced 

 behind the shell. Eye peduncles large, club-shaped, approximated 

 at their bases; tentacles short. Foot margined by a .parapodial 

 groove. 



Jaw delicate, thin, more or less arcuate, sculptured with fine 

 spaced subvertical striae (pi. 9, fig. 24, E. coma; pi. 9, fig. 21, E. 

 sylvia= buctinella.*) 



Radula having the teeth in somewhat sinuous transverse rows. 

 Central tooth tricuspid, the mesocone reaching about to the anterior 

 border of the basal-plate, side cusps small. Laterals similar but 

 somewhat asymmetrical, the entocone becoming larger outwardly 

 until it becomes joined at the base with the mesocone. The marginals 

 are very low and wide, by shortening of the basal-plates ; tricuspid, 

 the ento- and mesocone often joined at base ; ectocone smaller, simple 

 or split into two. Cusps variously degenerate on the outermost mar- 

 ginals (pi. 9, fig. 23, E. coma ; pi. 9, fig. 20, E. sylvia=buccinella.) 



In some species, such as E. dispersa Gassies, the entocone remains 

 minute upon all of the lateral teeth ; and in some the ectocone splits 

 on the marginals ; but otherwise the dentition of the species does 

 not differ from that of E. coma. 



The shell is like Goniodiscas in being umbilicated, depressed, rib- 

 striate ; whorls tubular, aperture round-lunar or crescentic. It 

 differs from Goniodiscus in the tendency of the upper lip to recede 

 toward its insertion, forming a Pleurotomoid sinus or notch between 

 outer lip and body-whorl ; and in the more or less depressed (some- 

 times concave) inner whorls. 



The species are very numerous, and they occupy a vast territory ; 

 but New Zealand, New Caledonia, and Australia with Tasmania are 

 their especial home. 



New Zealand species. 



E. anguiculus Rv. iii, 23. E. huttoni Sut. viii, 104. 



theta Pfr. E. infecta Rv. iii, 23. 

 E. bianca Hutt. viii, 97. zeta Pfr. 



v. montana Sut. v. irregularis Sut. viii, 98. 

 E. biconcava Pfr. i, 130 ; viii, 104. v. alpestris Sut. viii, 99. 



E. brouni Sut. viii, 102. E. lucetta Hutt. iii, 22. 

 E. buccinella Rv. iii, 23. stokesi Sm. iii, 262. 



gamma Pfr. E. moussoni Sut. viii, 105. 



sylvia Hutt. viii, 98. E. mutabilis Sut. viii, 101. 



