DUBLIN MICROSCOPICAL CLUB. 329 
Committee. 
St. Bartholomew’s—Mr. J. A. Ormerod. 
Charing Cross—Dr. M. Bruce. 
St. George’s—Mr. EK. C. Baber, 
Guy’s—Mr. F. Durham. 
King’s —Mr. H. 8. Atkinson. 
London—Mr. J. Needham. 
St. Mary’s—Mr. Geo. Giles. 
Middlesee—Dr. 8. Coupland. 
St. Thomas’—Dr. W. 8. Greenfield. 
University College—Mr. E. A. Schafer. 
Westminster—Dr. W. H. Allchin. 
General Profession—Dr. Foulerton. 
The retiring President then read an address, which was followed 
by a vote of thanks to the various officers,and the proceedings 
terminated. 
Dustin Microscorrcat Cuue. 
January, 1875. 
Polysiphonia Californica and its immediate allies.—Prof. E. Per- 
ceval Wright exhibited specimens of Polysiphonia Californica, 
Harv., with capsules and tetraspores. The former were decidedly 
stalked and quite unlike those of our native Polysiphonia atroru- 
bescens. Harvey would seem to have regarded his P. plumigera 
as a var. of P. Californica, and as perhaps connecting this form 
with P. bipinnata, P. and R. Ruprecht in describing his P. gem- 
ifera, refers to it as being very closely related to P. bipinnata, 
P. and R., so that it is by no means impossible that all these 
forms may on due investigation be referred to as local forms of one 
species with a geographical distribution extending over the whole 
of the northern portions of the Indian Ocean, on the Western 
American coast as far south as California, and on the Eastern 
Asiatic coast to the Amoor district. 
Embryo of Capsella.—Prof. McNab exhibited an embryo of 
Capsella at an early stage of growth, which presented the three 
layers of cells described by Hanstein as dermatogen, periblem, and 
plerum. The formation of the pileorhiza and the hypophysis was 
also distinctly shown. 
Structure of spine of Asthenosoma varium, Griibe.—Mr. Mack- 
intosh exhibited a section of a spine of this species. ‘lhese are 
short, moderately slender, verticillate or longitudinally striate, in 
section presenting two types of structure. One form, belonging to 
the striated spines, has the central hollow small and surrounded by 
very abundant reticulated tissue, solid pieces indistinct. Second 
