437 



Dominican Sections — Maury 



1 1 



Zone F and 70 per cent of the Zone F species occur in Bluff 1 and 

 the product of these two percentages gives 19.6. This we call 

 the reciprocal percentage which expresses the purely mathemati- 

 cal proportion. The reciprocal percentages of the Bluff 1 fauna 

 are as follows: — 19.6 to F, 14 to A, 10 to B, 4.5 to Bowden, 3 to 

 Bluff 3, 2 to G, 1.5 to Bluff 2, This reveals a remarkably strong 

 bond to F, also a rather strong alliance with A and B ; but a 

 very marked faunal break between Bluff 1 and Bluffs 2 and 3. G 

 is also set apart from Bluff 1 . 



Fauna of Bhtff 2.- 

 Bluff 2, Cercado : 



-The following species were collected at 



List of Species 



Acteocina triticum-tritonis, n. sp. 



Volvula cylindrica Gabb. 



Terebra spirifera Dall. 



Con us furvoides Gabb. 



Turris albida Perry. 



Drillia maonisriparum, n. sp. 



Mangilia Lalonis, n. sp. 



Cythara gibba Gpy. 



Cythara elongata Gabb. 



Cancellaria Barretti Gpy. 



Cancellaria islacolonis, n. sp. 



Oliva brevispira Gabb. 



Olivella muticoides Gabb. 



Latirus fusiformis Gabb. 



Phos Gabbi Dall. 



Alectrion cercadensis, n. sp. 



Murex cornurectus Gpy. 



Cassis sulcifera Sby. 



Malea camura Gpy. 



Cerithium uniseriale Sby. 



Turritella planigyrata Gpy. 



Rissoina crassilabris Gabb. 



Pdssoina Sagraiana d'Orb. 



Cmcibulum cf. pileolum H. C. Lea. 



Natica Youngi, n. sp. 



Natica sulcata Born. 



Polinices subclausa Sby. 



Dentalium dissimile Gpy. 

 Dentalium dissimile 



var. ponderosurn Gabb. 

 Cadulus phenax P. and S. 

 Cadulus elegantissimus P. and S. 

 Leda peltella Dall. 

 Area yaquensis n. sp. 

 Scapharca Henekeni, n. sp. 

 Fcapharca cibaoica n. sp. 

 Scapharca cor-cupidonis, n. sp. 

 Scapharca Arthurpennelli, n. sp. 

 Glycimeris acuticostata Sby. 

 Pteria inornata Gabb. 

 Pecten excentricus Gabb. 

 Pecten cercadica, n. sp. 

 Anomia simplex d'Orb. 

 Crenella divaricata d'Orb. 

 Pandora inconspicua Gabb. 

 Crassinella Guppyi Dall. 

 Venericardia scabricostata Gpy. 

 Phacoides domingensis Dall. 

 Miltha Smithwoodwardi, n. sp. 

 Cardium dominicanum Dall. 

 Cardium haitense Sby. 

 Cardium haitense 



var. cercadicum, n. var. 

 Cardium venustum Gabb. 



