122 PROCEEDINGS OF SOCIETIES. 



might be convenient to indicate tliese winter growths of Bryopsis 

 as its Vaucheria-condition, the history of which has yet to be 

 written. 



May IQth, 1878. 



Section of Eajii's Penis, shown under a 1^ inch Smith and 

 Beck's objective. Mr. B. Wills Eichardson exhibited a carmine 

 stained cross-section of a ram's perns he had prepared a few 

 previously. The portions corresponding to the human corpora 

 cavernosa were mostly composed of dense fibrous intersecting 

 bauds, the intersections being closest at the part where the 

 septum in the penis of man is situated. These bands passed 

 outwards to join longitudinal bands, also of great density, 

 which formed the outer wall of the section. An artery and a 

 vein, the representatives of the corpora cavernosa vessels in 

 man, passed through the centre of each half of the section. In 

 spaces between some of the decussating bands, near the circum- 

 ference of the section, there were portions of unstained tissue 

 largely composed of remarkably fine fibres. Clusters of fat cells 

 vpere seen in some of the spaces. There was no corpus spon- 

 giosum, strictly so-called. In the section exhibited it was repre- 

 sented by unstained bands which, as it were, held the urethral 

 wall in position. These were probably cross-sections of blood 

 channels. The urethra itself resembled the collapsed human 

 urethra, being in the section a transverse slit having short fissures 

 leading from it. 



Sections of Strongylocentrotus nuclus, exliihited. — Mr. Mackin- 

 tosh exhibited a cross section of the spine of Strongylocentrotus 

 nudus, A. Agass., which showed a small central axis of reticular 

 tissue, numerous well-marked cycles of solid wedges, the whole 

 structure recalling that of Str. armiger, A. Agass. described in 

 Club Minutes of April, 1875. The sections being made purposely 

 rather thick, showed the brilliant purple and yellow colouration 

 to great advantage. 



New Goscinodiscus. — Eev. E. O'Meara exhibited an undescribed 

 form of Coscinodiscus found in material collected by Mr. Moseley 

 in the harbour of Hong-Kong. This form was of considerable 

 size, btiiig •0143" in diameter ; the middle of the valve perfectly 

 smooth, having a somewhat stellate appearance in consequence of 

 the radiate lines of areoles being of unequal length, the ends of 

 some approaching nearer than others to the centre. The lines of 

 areoles are close, the areolfs small throughout, distinctly larger 

 towards the margin. This striking form Mr. O'Meara proposed 

 to name Coscinodiscus Sinensis from the locality in w'hich it was 

 found. 



Copal with embedded organism^exhihited. — Mr.M'Donnell, lately 

 from Lakes Nyassa and Nyanza, showed a large series of polished 

 pieces of copal, having embedded a variety of insects, leaves of 

 plants, &c., in good preservation, and ready to be submitted to a 

 low power of the microscope. 



