Hyatt.] 400 [June 12, 



microstomum in the young of the specimens -which I have exam- 

 ined, but the large ear-like lappets are very dissimilar character- 

 istics. The abdominal channels are present in some specimens of 

 microstomum, and in some of the other species of the group as a rare 

 variation, so that their prominence in this species can not be consid- 

 ered as absolutely conclusive against this view of the affinities. 



I have failed entirely in finding any species of the Parkinsoni 

 group to which the young might be compared. The development 

 of the ears seem to decide in favor of its association with the 

 Sauzei group, but the large rostrum between them is an entirely 

 new organ, not shown in either Braikenridgii, Sauzei or linguiferum. 

 In fact it has the most curious and unaccountable mingling of the 

 characteristics of several groups, with certain prominent character- 

 istics entirely peculiar to itself. Quenstedt quotes one form as found 

 in the Parkinsoni-bed, and speaks of this in " Die Cephalopoden " as 

 an undoubted " crippled " Parkinsoni. I have failed to recognize this 

 fact in his collection. My notes give me no hints on the subject, and 

 I may have omitted seeing the specimens he refers to. 



Whether to connect this species with the Microstoma impressa 

 Quenst. of the White Jura or not, I cannot say. There appears to 

 be a close affinity between the development of the young, and the 

 abdominal furrow is well developed; but on the other hand such re- 

 semblances might occur in simply representative species of distinct 

 genetic series. The Amm. SchapMtoides Coynarti of the Oxford, 

 fine specimens of which exist in the Prof. Moesch's collection at 

 Zurich, has an irregular form and the same furrow in the abdomen 

 of the living chamber, but the mouth was not shown. Amm. Chap- 

 uisi and Collinii Oppel of the White Jura of the same collection, are 

 evidently closely allied to Amm. scaphitoides, but like that species 

 resemble refractum only very remotely, and I think will be traced 

 eventually to some form in the White Jura. 



Section of Botany. June 12, 1876. 



Mr. W. P. Wilson in the chair. Twenty-seven persons 

 present. 



Mr. Charles Wright made some remarks on the characters 

 of Bubus villosus and canadensis, calling attention to an in- 



