1 6 Bulletin 30 433 



cene of Anguilla. This gives us an additional bond with that 

 island. 



The family Eryonidce now is in deep water and not common. 

 This accords with the deep sea affinities of a number of our mol- 

 luscs from various Dominican localities. Miss Rathbun further 

 notes that Orithyia is now limited to the East Indies and" is 

 scarce. Calappa flammea and Persephona are Atlantic forms, 

 while Cycloes bairdii and Portunus spinicarpus are both Atlantic 

 and Pacific in recent time. The same is true of Mesorhcea , a rare 

 genus with but two living species, one on the East, the other on 

 the West side of Tropical America. This genus has never before 

 been found as a fossil. These Pacific and East Indies affinities 

 shown by certain of the Crustacea harmonize with the Pacific 

 and East Indian relationships of a number of the mollusca. 



Evidence of the Bryozoa. — Dr. Bassler and Dr. Canu, who 

 have been so kind as to identify the Bryozoa we collected, write 

 me that "the Bryozoa indicate a Bowden age of the rocks. 

 Bluffs 2 and 3, Cercado de Mao, have the best faunas and show 

 the relationship most clearly. Rio Cana, Zone I ; Rio Amina, 

 Hato Viejo to Potrero ; and Rio Gurabo, Zone G, contain few 

 but the same species." 



The Molluscan evidence correlating Bluffs 2 and 3 with I 

 and G is thus strengthened by the Bryozoan fauna. 



Relation of the Cercado Bluff s Faunas to the Recent A?itillean 

 Fauna. — Of the sixty-four molluscan species we collected in Bluff 

 1 only three have lived on to the present time, namely, Cyprcsa 

 spurca, Natica can?'ena and Lcsvicardium serratum. Three also oc- 

 cur among the sixty one species of Bluff 2, namely, Rissoina Sag- 

 raiana, Natica sulcata and Anomia simplex. Of the 162 species 

 of Bluff 3, ten species have lived on nearly or quite unchanged : — 

 Acteocina canaliculata, A. recta, Mv.rex messorius, Rissoina Sagra- 

 iana, Natica sulcata, Fissuridea alternata, Lucina chrysostoma, 

 Diplodonta pwicturella, Merisca crystallina, Sirigilla pisiformis. 

 But if the entire number of recent Antillean species were taken 

 into consideration and the reciprocal percentage calculated it 



