122 PROCEEDINGS OF THE ACADEMY OF 



May 7. 

 Mr. Vaux, Vice-President, in the chair. 

 Twelve members present. 



Mr. Thomas G. Gentry called the attention of the Academy to 

 what he regarded as a rare and remarkable case of hybridism, 

 which occurred between Macacus nemestrinus, male, and Macacus 

 cynomolgus, female. After exhibiting an alcoholic specimen of 

 the young, and a stuffed specimen of the mother which was clearly 

 identified as Ilacacus cynomolgus, he detailed the leading charac- 

 ters of the two parents. 



He stated that the male differed from the female in being more 

 robust and of greater dimensions; in the almost perfect smoothness 

 of the face, which is of a pale flesh color, while in the female it is 

 black and invested with a close grow T th of short black hairs ; in the 

 absence of a crest upon the head of the male, which is a prevailing 

 characteristic of the species (31. nemestrinus), and its presence in 

 the female, which is a prominent feature of the species to which she 

 belongs; in color; and, lastly, in the unequal development of the 

 caudal appendage, which in the male is about seven inches in 

 length, and densely clothed with long hairs, while in the female 

 it is more than twice the length, and nearly naked for more than 

 two-thirds of its extent. 



He further said that there could be no doubt of the genuineness 

 of the case, as the tw T o had been isolated from all other monkeys 

 during the past two years. 



Healso called the attention of the Academy to a fact which he 

 believed not to be generally known, and which goes far to show 

 the close relationship between the Bimana and Quadrumana. In 

 this instance, the menstrual flow, as sometimes occurs in the 

 human species, continued at the regular periods up to the time of 

 birth. 



May 14. 



The President, Dr. Ruschenberger, in the chair. 



Twentj'-seven members present. 



The following paper was presented for publication : 

 " Notice of some Crustacea from the Island of St. Martin, W. I. 

 Collected by Dr. Van Rijgersma." By T. Hale Streets, U. S. N. 



Mr. Thomas Meehan observed that on several occasions, before 

 the Academy and other scientific bodies, he had offered some facts 

 and suggestions tending to prove that what are popularly termed 



