MARINE BIOLOGICAL STATION AT PORT ERIN. 119 
for the first time. Fish eggs and larve 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 larve reappeared 
in small numbers. In addition to the Meduse previously 
recorded, Margelis bella, Huchilota pilosella, and Aurelia 
aurita were present in fair numbers, and the medusa of 
Corymorpha nutans and the Actinula larva of Twbularia 
were represented by several specimens of each. Sagztta 
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 Chetopterus variopedatus. On July 16th and during the 
following week Aurelia aurita and Beroe ovata were pre- 
sent in the Bay in enormous numbers, and Tvara 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 
Hydromedusz disappeared from the tow-nettings, while 
Melicertidium octocostatum was noted for the first time 
on the llth. A species of Obelza was then common, and 
Agalmopsis elegans was still represented. Amongst a few 
Echinoid plutei that of Hcehinocyamus 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, 
