248 PROCEEDINGS OF THE ACADEMY OP 



Nauina subcircula, Mousson. 



Raiatea, Society Islands, Mr. Garrett to Dr. W. D. Hartraan. 



Jaw not observed. 



Teeth (pi. XX., fig. 1) with obsolete side cusps, but distinct 

 cutting points on the centrals. Laterals unsj'mmetrical as usual 

 by the suppression of the inner cutting point, and inner lower 

 lateral expansions to the base of attachment. Marginals aculeate, 

 bifid. 



The species is vivipai'ous. 



Endodonta tumuloides, Garrett. 



Raratonga I., Cook's Isle. Received from Dr. W. D. Hartman, 

 who received it from Mr. Garrett. 



Teeth 11— 1—17, with about 7 perfect laterals (pi. XXL, fig. 6). 

 The base of attachment of the centrals is subequilateral. There 

 are distinct side cutting points and cusps. The median cusp is 

 long. Laterals unsymmetrical as usual. Transition formed as 

 usual. Marginals low, wide, with one long, large, bifid inner cut- 

 ting point and one small side cutting point. 



Jaw not observed. 



Helix astur, Souv. 



New Caledonia, Mr. Thomas Bland. 



Jaw (pi. XX., fig. 11) low, wide, slightly arcuate ; ends scarcely 

 attenuated, blunt ; anterior surface without ribs ; a wide, blunt, 

 median projection to the cutting edge ; a line of reenforcement 

 running above, and parallel to, the cutting margin ; a strong 

 muscular attachment to the upper margin. 



Lingual membrane (pi. XX., fig. 12) with 30 — 1 — 30 teeth, with 

 about 9 perfect laterals. Centrals (a) with square base of attach- 

 ment, well-developed side cusps and cutting points ; laterals same 

 as centrals, but unsymmetrical as usual ; transition to marginals 

 foi'med as usual (b) ; marginals (c) low, wide, with one inner, long, 

 broad, bifid cutting point, and one outer, small cutting point ; 

 those figured (c) are extremes. 



Helix (Thelidomus) auricoma, Fer. 



Lomas de Camoa, Cuba. Mr. Arango to Mr. Bland. 

 •Jaw arched, with blunt, scarcel}' attenuated ends; 12 broad ribs 

 distributed over the whole anterior surface and denticulating either 

 margin ; no median projection to the cutting margin. 



Lingual membrane (pi. XXL, fig. 5), with 42 — 1 — 42 teeth, of 



