MARINE BIOLOGICAL STATION AT PORT ERIN. 311 



for the first time. Fish eggs and larvae were still present 

 in small numbers. Echinoid plutei of two, possibly three, 

 species were present in large numbers in a tow-netting 

 taken shortly before sunset on June 5th, and during the 

 following week Ophiuroid plutei became almost equally 

 numerous. Auricularia and Bipinnaria larvae reappeared 

 in small numbers. In addition to the Medusae previously 

 recorded, Margelis bella, Euchilota pilosella, and Aurelia 

 aurita were present in fair numbers, and the medusa of 

 Corymorpha nutans and the Actinula larva of Tubularia 

 were represented by several specimens of each. Sagitta 

 was common, as also was the post -larval stage of 

 Pectinaria. Evadne nordmanni and Podon intermedium 

 were found in increasing numbers in every tow-netting 

 taken during .this month. The number of larval forms 

 reached its maximum during the last week in June. 



The tow-nettings taken in the early part of July were 

 similar to those of the latter end of June, the only addition 

 to the organisms then recorded being the post-larval stage 

 of Chtftopterus variopedatus. On July 16th and during the 

 following week Aurelia aurita and Beroe ovata were pre- 

 sent in the Bay in enormous numbers, and Tiara pileata 

 was common at the surface during the calm evenings of 

 the following week. A species of Cyanea also occurred 

 sparingly at this time. 



During the early part of August several of the 

 Hydromedusae disappeared from the tow-nettings, while 

 Melicertidium octocostatum was noted for the first time 

 on the 11th. A species of Obelia was then common, and 

 Agalmopsis elegans was still represented. Amongst a few 

 Echinoid plutei that of Echinocyavvus pusillus was noted. 

 On the 19th Ophiuroid plutei were again numerous, and 

 on the 22nd the Zoea and later larval stages of Macrura 

 and Brachyura reached their maximum in numbers. 



