156 



bluish. Bill, black, except base of lower mandible, which is 

 bluish. 



Female, 8g inches long, marked like the male, but not so 

 brilliant. Irides, hazel. Tail consists of 12 feathers. 



Momotus Yucatacensis. Black-th mated Motmot. 15 to 15f 

 inches long. Bill, 2-J inches long ; gape, If inch along ridge, 

 J inch broad, 7-16 of an inch through at base from above down- 

 wards. About 50 serrations can be counted on each edge of upper 

 mandible, and 32 on each edge of lower. A strongly marked ridge 

 runs along roof of mouth to within f inches of point of bill. Tar- 

 sus, J of an inch long. Tail, 8J inches long, bare part of two 

 central tail feathers, about 2 J inches. Along top of head, upper 

 part of back, rump, cheeks, breast and sides of neck, reddish green 

 or olive. In middle of back is a spot of bay. A stripe of very 

 light blue, like some of the salts of copper, passes from base of bill 

 almost to nape, along each side of head. A black stripe extends 

 under each eye to neck. Another black stripe passes down mid- 

 dle of chin to upper part of breast, growing broader as it descends, 

 and mixed with light blue on chin, and bordered on each side with 

 the same color. Abdomen, under tail coverts and flanks, bright 

 rufous. Primaries and tail light green, changing to blue in some 

 lights, tipped, and more or less bordered with black. 1st primary, 

 longest ; 4th, shortest. Ten tail feathers. The expansion at end 

 of two middle tail feathers, about half bright pale green varying to 

 blue, and the other half black. Eyes, hazel. Legs and bill nearly 

 black. 



Mr. Bouve reported upon some fossil shells from the 

 Tertiary of Europe, which had been committed to him, 

 and made some remarks upon the prevalence of the differ- 

 ent strata of this class in Great Britain, as also of their 

 paleontological contents. 



In relation to what has been published upon the subject, he took 

 the opportunity of calling the attention of any present, who might 

 not be aware of the fact, to the discrepancy in the difle rent accounts 

 of the English Tertiary, found in the most popular works. For 

 instance. In Mantcll's Wonders of Geology, the author, remarking 

 upon the Miocene (Tertiary) deposits, states that there are no good 



