110 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



marine forms devoted himself specially to the investiga- 

 tion of the Lug-worms, Arenicola. The following extract 

 is from a letter written by Mr. Ash worth to the Hon. 

 Director on leaving the Laboratory: — ''During the last 

 weeks I was engaged nearly all the time upon Arenicola. 

 I took your advice and went over to Bay-ny-Carrickey last 

 Monday, and in about one-and-a-half-hour's searching 

 obtained five specimens of Arenicola ecaudata, and on 

 Wednesday I went to the same place again and obtained 

 about a dozen more. I have got the ova and sperms 

 from them, the latter almost ripe, and T have made several 

 dissections and find many points of difference between 

 this species and Arenicola piscatorum. I intend to follow 

 this work up after my return to College in October. I 

 have enjoyed my visit to Port Erin very much, and have 

 found the laboratory very convenient for work. I am 

 greatly obliged to you for the many valuable suggestions 

 and help you have given me while I have been there, and 

 I thank you most sincerely for them." 



Mr. Ash worth is preparing a paper on Arenicola 

 piscatorum and A. ecaudata, which will be laid before the 

 Liverpool Biological Society during the present session. 



Professor Weiss reports that he investigated the 

 Diatoms of the plankton during the month of April, with 

 special reference to the variation in the preponderance of 

 the various forms at different times. In this connection he 

 observed the breaking-up of the protoplasm of Chcetoceros 

 and Coscinodiscus into eight or sixteen nucleated masses 

 within the parent frustule, as recently described by Mr. 

 George Murray before the Linnean Society of London 

 (June 18th). He also collected a large quantity of the 

 Coralline Alga?, both shore and deep water forms, an 

 account of which he is preparing for the Liverpool 

 Biological Society. 



