92 JOURNAL OF THE [April, 



2. Pipe-fish, Syngnafhi/s acus L. Entire fish, young, stained : 



by L. RiEDERER. 



3. Sagittal sections of the head of the same : by T.-. Riederer. 



4. Type-slide of 50 recent and fossil Foraminifera, prepared 

 by Edmund Wheeler : by H. W. Calef. 



The following all by Anthony Woodward : 



5. Type-slide of 100 species of Foraminifera, from H M. S. 

 "Challenger" Expedition, Torres Straits, 155 fathoms, prepared 

 by Joseph Wright, Belfast, Ireland. 



6. Section of Eozoon Ca/iadense. 



7. Section of fusulina limestone from Nevada. Also many 

 specimens, such as Plauorbulina larvata, Calcarina Spengleri, 

 Assilina, Ni/ntulites, Orbifoides Majitelli, Fusulina cylindrica, 

 Foraminifera of the U. S- coast, of Bermuda, of Singapore, and of 

 the Vienna Basin, and others embracing forms extending from 

 the carboniferous age to the present time. 



A discussion on building-stone was participated in by Messrs. 

 A. Woodward and M. M. Le Brun. 



Mr. Riederer gave the following description of his exhibits : 

 " The Actiniae belong to the Coelenterata, or zoophytes. They 

 are cylindrical and radially symmetrical. The oral opening is used 

 not only for the reception of the food, but also for the rejection 

 of excreta. This opening is surrounded by tentacles — contractile 

 tubes — bearing, especially near the ends, large numbers of ' nettle- 

 cells ' — cnidoblasts. 



"The cavity of the body is divided by numerous vertical 

 partitions — mesenteric folds — into a system of vertical pouches, 

 which communicate with one another at the bottom of this 

 gastric cavity. At the upper extremity the pouches aie con- 

 tinuous with the canals leading into the hollow tentacles, since 

 the edges of the mesenteries bounding them unite with the wall 

 of the oral tube, which hangs from the mouth. The generative 

 organs rise on the mesenteries as band-shaped or folded thick- 

 enings. 



" The body of Actinia has no hard structure. By means of 

 contractile muscles, causing inflow and outflow of water, large 

 differences in size and shape are produced. The contractile foot 

 allows departure from the place of attachment. Many Actiniae 

 reach a relatively large size and possess beautiful colors. 



