Kneeland.] 372 [January 20, 



bilobatum Hyatt, which has, as previously described, Ammonite-like 

 cells, only two on the whole side. 



Loc, Cajamarca, Peru. Coll. by J. B. Steere. 



Buehiceras attenuatum Hyatt. 



In this species the form of the whorl in the adult, and the lobes 

 and cells are more decidedly ammonitic than in the preceding spe- 

 cies. It may be seen, however, that this is due to the compli- 

 cation of the outlines of lobes. The young possess lobes and cells 

 of simpler form and outlines. The division of the suture by a median 

 lobe longer than the rest, dividing the numerous shallow auxiliary 

 lobes and cells from the others, is a characteristic indication of an 

 affinity with the previously described Buehiceras bilobatum. There 

 is also, although very faintly expressed, a line of tubercles near the 

 abdomen, and another more prominent lateral line on the edge of the 

 abdomen. The whorl is greatly compressed laterally, smooth with 

 the exception of these lines of tubercles, and has a narrow, flat 

 abdomen or channeled area. It is most closely allied with Buehi- 

 ceras pierdenalis x but differs not only in the flattened abdomen but 

 in the sutural outlines. The latter has cells with smooth outlines, but 

 in this species the celh and lobes are not only divided into two parts 

 by median minor lobes, but digitated by numerous shallower minor 

 lobes throughout their whole extent. 



Loc, Celendin. Coll. by J. B. Steere. 



Dr. S. Kneeland made a communication, illustrated by 

 the lantern, on the volcanic phenomena of Iceland, especially 

 as seen in the valley of Thingvalla, where was held the mil- 

 lennial celebration of 1874, at which he were present. 



The thanks of the Society were voted to Mr. T. Martin 

 Trippe for a collection of eight skins of Leucosticte from 

 Colorado. 



1 1 have had remarkably fine specimens of this species from Texas in the collec- 

 tion of the Museum of Comp. Zoology at Cambridge for comparison, and find that 

 both this and Glottoceras attenuatum exist in that fauna. 



