155 



the genera Achatina and Bulimus, it is more intimately allied and 

 has been confounded with them. The buccal pouch is many times 

 longer than its breadth, while in all the above genera it is ovoidal. 

 There is no horny beak at the entrance of the mouth. The teeth 

 are arranged en chevron instead of transversely, and there is no 

 teeth on the median line. It has the anterior portion of the mem- 

 branous part of the stomach terminating in a cul de sac. The sa- 

 livary glands form a distinct collar around the oesophagus, and are 

 not separate as in the other genera. In Bulimus and Achatina the 

 anterior lobe of the liver is largest; in Glanclina it is smallest. 

 There appears to be but one bile duct in the latter, while there 

 exist two large ones in the smaller. The third pair of tentacles, so 

 prominent in Glandina, are very slightly developed in Bulimus and 

 do not exist in Achatina. In the two former, they are provided 

 with a special nerve. In Achatina, the male organ is enveloped 

 in a large and muscular sheath, which does not exist in any of the 

 other genera. 



Dr. Cabot exhibited three birds from Yucatan, which he 

 regarded as new. and of which he read descriptions. 



Corvus vociferus. Male, about 16 inches long. Tail, 1J 

 inches. Bill, 1-J- inches along ridge, and 1J along gape; J 

 inch diameter at base. Nostrils rounded, partially covered with 

 bristly hairs. Tarsus, If inches. Middle toe, 1J inches 

 long. First primary shortest ; 5th, longest. Dark brown on 

 head, chin, neck, back and upper part of tail. A steel grey 

 spot on cheeks. Tail consists of 12 feathers, all tipped for about 

 one-third their length, with white, except the middle ones, which 

 have merely a white mark on each side the shaft, near the tip. 

 Under parts and flanks are white. Bill, black. Iris, brown. 



Female, 15J inches in length ; brown, lighter than the male. 

 Bill, yellow. 



Oriolus musicus. Male, 9 J inches long. Tarsus, 1 1-16 

 inches long. Bill, J of an inch along gape ; -J along ridge. 

 Tail, 4J inches long. Head, neck, cheeks, breast, belly, rump, 

 tertiaries, and nearly the whole length of the two outer tail feathers, 

 and the lower part of the third, and sometimes a stripe on the 

 fourth, bright chrome yellow. Face, throat, primaries, second- 

 aries, back, and four, sometimes six tail feathers, black. Legs, 



