41i 



to photograph this object with a very small condenser cone. If 

 this is done we get a constricted head with a very fine line 

 extending about two-thirds clown the " exclamation mark." A 

 photograph showed the effect of a very small cone (0*35) giving 

 an image with a head resembling a pin-head. After taking 

 another photograph (exhibited), with aperture 065, he found 

 that the focus had not altered in the least, and cut down the 

 condenser to 45 to observe the effect produced. This gave 

 the constricted head and fine line. He was convinced that 

 photographs with a very small cone gave an altogether wrong 

 impression. Mr. O'Donohoe made some further remarks on 

 some fine transverse markings which he had not seen before, but 

 which had been noted by Mr. Nelson. 



Mr. C. F. Rousselet, F.R.M.S., read a note on the " Rotatorian 

 Fauna of Boston, U.S.A.," with a description of Notholca bostoni- 

 ensis, sp. nov. The author, who attended the seventh Inter- 

 national Zoological Congress in August, 1907, at Boston, U.S.A., 

 as delegate of the Quekett Club, examined the lakes and ponds 

 in the vicinity of the city. Examination of the material collected 

 has shown the presence of forty different species of free-swimming 

 Rotifera, one of which, zV. bostonie?isis, is new to science, and 

 another, a free-swimming Oecistes (sp. ?), probably also new, 

 and several rare and interesting species which have been met 

 with only once before. The new species has considerable resem- 

 blance to iV. longispina, Kellicott — a well-known and widely 

 distributed species ; but close examination shows important 

 differences in the structure of the lorica. Preparations of the 

 new species and of several other forms were exhibited under 

 microscopes. 



Mr. D. J. Scourfield, F.Z.S., F.R.M.S., made some remarks 

 on the Entomostraca Mr. Rousselet had brought from Boston, 

 some preparations being then exhibited, and mentioned that 

 all forms of Diaptomus from U.S.A. were different from the 

 European forms. 



Mr. T. B. Rosseter, F.R.M.S., read a paper on the family 

 Taeniidae. He said his first intention had been to give to the 

 meeting an account of his work on Hymenolepis farciminalis, 



