33* Dominican Fossils — Maury 167 



that region is roundly and excessively inflated. The outline is 

 trigonal, the anterior part very small, with beaks at the anterior 

 fifth, posterior part widely spreading. A sinus extends to the 

 well developed notch in the anterior ventral margin. Length 12. 

 altitude beak to base 6, posterior altitude 13.50, semi-diameter 

 4 mm . 



The general appearance of this shell recalls some of the deep 

 water species like Bathyarca pecttmcidoides, B. oulebrensis , Cu- 

 cullaria asperula, and C. sagrinata although there is no gap in 

 the teeth as in many such forms. Because of the variation from 

 typical Noetia, and the possible analogue with deep water forms, 

 it seems best to establish for it the new section Sheldonella to 

 contain thin, small, trigonal Noetias without the angular umbon- 

 al ridge. 



Locality. — (Kxp'd '16) Bluff 3, Cercado de Mao (Extreme- 

 ly abundant). 



Subgenus Scaphara Gray 



Scapharca Henekeni, n. sp. 



Plate 29, Figure 2 



Area consobrina Sowerby, Quart. Jour. Geol. Soc. London, vol. 6, p. 



52. pi. 10, fig. 12, 1849. 

 Not Area consobrina d'Orbigny, Pal. Francaise, Terr. Cretaces, vol. 3, 



p. 209, pi. 311, figs. 4-7, 1844. 

 Area consobrina Guppy, Quart. Jour. Geol. Soc. London, vol. 32, p. 



53*, 1876. 

 Area consobrina Dall, Trans. Wagner Inst. Sci., vol. 3, pt. 4, p, 646, 



Area consobrina Sheldon, Palasont, Atner., vol. 1, p. 49, 1916. 



As Dr. Dall and others have pointed out, Sowerby' s name 

 is preoccupied. The writer would suggest as a new name Hene- 

 keni, in honor of Colonel Heneken by whom the type was col- 

 lected. 



This Scapharca belongs to a group comprising many species 

 of which hypomela, lienosa, secticostata, and halidonata are well- 

 known members. The principal feature of the species is its 

 grooved and beaded ribs, numbering thirty-five or thirty- six; the 



