252 REV. R. BOOG WATSON ON THE 



form of the ribs from which the species is named ; across the base 

 it is slightly flattened and patulous, with a faint open canalicula- 

 tion towards the point of the pillar. Pillar, with a. minute but 

 distinct twist, is very oblique both backwards and to the left ; the 

 line of it runs very straight across the body and out nearly to the 

 point of the pillar, where it curves round to join the basal lip. 

 Inner lip : a thinnish porcellanous glaze crosses the body and 

 spreads a little outside of the mouth and round the base of the 

 pillar, to which it also forms a very narrow, thin, and flatly patulous 

 edge, which is angulated both to the inside and the out. H. 0-26. 

 B. 0-09. Penultimate whorl, height 0-044. Mouth, height 0-055, 

 breadth 0'05. 



This very beautiful little shell has some features of resemblance 

 to the last (Fenella elongata, W.). The twist on the pillar-lip, 

 though very slight, is unmistakable ; and this feature makes the 

 absence of the extreme tip of the apex the more to be regretted, 

 as its character would have determined whether this species ought 

 not more properly to have been classed among the Odostomias. 

 DunJceria, however, has an elasticity which makes it very suitable 

 for a doubtful classification. Dr. Philip Carpenter, in the Ma- 

 zatlan Catalogue, p. 433, in establishing the subgenus, says that 

 it " combines the characters of Chemnitzia and Aclis, presenting 

 the mouth of the former with the rounded whorls of the latter. 

 It agrees with all the other sections of the family in having its 

 limits badly defined." 



1. N. pMlippinensis, n. sp 



2. N. atypJia, n. sp. 



3. N. pseustes, n. sp. 



4. _ZV. suturalis, n. sp. 



5. -ZV". radiata, n. sp. 



6. N. amphiala, n. sp. 



Natica, Adanson. 



7. JST. leptalea, n. sp. 



8. N. xaiitha, n. sp. 



9. N~. prasina, n. sp. 



10. JSf.fartilis, n. sp. 



11. N. apora, n. sp. 



1. Natica philippinensis, n. sp. 



St. 210. Jan. 25, 1875. Lat. 9° 26' K, long. 123° 45' E. Phi- 

 lippines. 375 fms. Mud. Bottom temperature 54°'l. 



Shell. — Bather depressedly but conically globose, umbilicate, 

 with rounded prominent whorls, thickish, slightly ribbed and 

 spirally striate, yellowish, with a brownish band above the peri- 

 phery. Sculpture. Longitudinals — the upper whorls are closely 



