30 ENDODONTA. 



To Mr. H. Suter, is due our knowledge of the dentition and jaw 

 of this peculiar shell, as well as the determination of its systematic 

 position. Anatomically it presents no divergence from the typical 

 Charopas, but the elevated pupiform shell resembles Pupa far more 

 than Charopa. 



E. novoseelandica Pfr. ix, pi. 6, f. 60. New Zealand. 

 Pupa neozelanica auct. 



Subgenus zEscHRODOMUS Pilsbry, 1892. 



jflschrodomus PILS., Nautilus, vi, p. 55, footnote (Sept. 5, 1892), 

 Thera HUTTON, Trans. N. Z. Inst., xvi, p. 193. Not Thera 

 Stephens, 1831. 



Shell elevated, dome-shaped, the altitude about equal to the diame- 

 ter. Whorls rather narrow, the apical 1 5 forming a light colored 

 spirally striated distinct embryonal shell ; the lower whorls 

 sculptured with oblique lamellar riblets which bear hairs where they 

 cross the angular periphery ; base flattened ; umbilicus small but 

 open. Aperture toothless, the peristome thin, simple. Type E. 

 stipulata Rv., pi. 6, figs. 67, 68. 



Animal (of E. stipulata) like that of Charopa coma; mantle sub- 

 central, slightly reflected over the peristome ; eye peduncles long 

 and cylindrical ; tail short, pointed, and with no mucous gland. 



Jaw thin and delicate, but little arched, broadly and faintly verti- 

 cally striated, sometimes showing a line of reinforcement parallel to 

 the cutting edge (pi. 8, fig. 4, E. barbatula}. 



Radula consisting of about 100 almost straight transverse rows of 

 teeth, the formula varying from 9-3-1-3-9, 10-4-1-4-10 or 10-6- 

 1-6-10 (in stipulata) to 15-1-15 (in barbatula). Central teeth tri- 

 cuspid, the mesocone attaining the anterior margin of the basal 

 plate or shorter. Laterals similar but with longer mesocones. 

 Inner marginals tricuspid, the outer quadricuspid by splitting of the 

 ectocone; the outermost having one broad low cusp (pi. 8, fig. 3, 

 E. barbatula Rv. 



This group differs from typical Charopa in its elevated, thimble- 

 like contour, and the peripheral fringe of hairs borne by the riblets. 

 Both of the species are from New Zealand. 



E. stipulata Rve. iii, 94. E. barbatula Rve. iii, 95. 



alpha Pfr. beta Pfr. 



