Wilder.] 188 [April 12, 



2, 204), seems to have noted the antagonistic relation of the ancon 

 and genu and Humphrey, 36, 14, admitted a functional antagonism 

 of the proximal parts of the membra; Gerdy, 9, (?), had already 

 taken an artistic view of the symmetrical relation of the two ends of 

 the body which he called " superior" and " inferior, " which, like 

 Humphrey, he traced in the proximal parts of the membra. Agassiz 

 probably included under the term cephality an idea of homology, but 

 it is not distinctly expressed by him or by Dana; and the idea of a 

 symmetrical homology between parts at the two poles of a longitudi- 

 nal axis has been evolved into something like clearness by Wyman 

 and his pupils. All the arguments in favor of the generic term anti- 

 tropy apply with even greater force to the specific term meketropy, 

 for otherwise a compound term would be required. 1 



Section of Microscopy. April 12, 1871. 



Mr. E. Bicknell in the chair. Eight members present. 



Mr. R. C. Greenleaf stated that he had hastily examined 

 some soundings made by Lieut. Brook, between San Fran- 

 cisco and the Hawaiian Islands. In samples from a depth of 

 3,300 fathoms, he had found in abundance a peculiar form 

 which he had not yet been able to identify. In 2,500 fath- 

 oms Triceratium spinosum and Eunodia gibba Bailey, were 

 found. Many beautiful Polycistina occurred in soundings in 

 2,600 fathoms. Mr. Greenleaf promised an extended report 

 on these soundings at a future meeting. 



Mr. C. Stodder made some remarks on the nature of the 

 Podura scale, so called, which strictly belongs to a species of 

 Lepidocyrtus. 



For thirty years it has been considered the best test object 

 for the microscope. About a year ago Dr. Royston Pigott 

 published a paper, in which he declared that the so called 

 exclamation marks were illusions, and gave reasons for be- 

 lieving that this appearance is caused by two rows of par- 



1 To be concluded. 



