MARINE BIOLOGICAL STATION AT PORT ERIN. 203 



plates on the pleon of the female have the edges crenulate, 

 and are more or less pointed at the apex ; of the six pairs 

 the first are least, and the last most, acute. The two last 

 pairs of marsupial plates have very small setules on the 

 hinder margin. The eyes of the female are very small 

 and indistinct. „ ... In the very much smaller 

 Pleurocrijpta intermedia the eggs, as you will see on the 

 slide (although they had not left the marsupium, but were 

 taken from it), show a development equivalent to the 

 ' first larval stage.' In all three specimens, as usual, the 

 flattened back of the animal was pressed against the 

 branchiae of the host, while a vast quantity of eggs held 

 together on the ventral side by the large and thin marsu- 

 pial plates, distended the carapace of the host in a remark- 

 able manner." 



Mr. Chadwick, of Manchester, as a result of his work last 

 year at the Station, has published an important paper on 

 some points in the minute structure of the haemal system 

 of our Asterids. This summer he made some observations 

 upon a species of Synapta, which is found to be not un- 

 common in the muddy shingle, near low tide, close to the 

 Biological Station, During September we found that 

 some of the common Amphiura squamata were swarming 

 with the remarkable parasitic Orthonectid Bhopalura. 



Binopliilus tceniatus appeared again this spring in con- 

 siderable abundance, and was found to be breeding early 

 in April. Our marine insects, which have been hitherto 

 rather neglected, will, it may be hoped, receive adequate 

 treatment in the future, as Prof. G. S. Brady and Prof. 

 Miall have announced their intention of taking up this 

 group of animals. We find the red s^^onge Halichondria 

 caruncula at Port Erin very commonly has its oscula 

 occupied by the Amphipod Tritceta gihhosa. The red 

 compound ascidian Bistomiim riihrmn from the Calf Sound 



