14 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Mr. R. D. Laurie worked at variation in Purpura 

 lapillus in relation to environment. Professor Moore was 

 making preliminary observations with a view to certain 

 Bio-cheniical investigations which he wishes to conduct 

 in our tanks during the coming season. 



Mr. A. D. Imnis was collecting, studying and pre- 

 serving the marine apterous insect Anurida with a view 

 to the L.M.B.C. Memoir on that type upon which he is 

 now engaged. He also collected, in chinks of the shore, 

 5 examples of a Pseudoscorpion which he identified as 

 Obisium maritimum, Leach (confirmed by the Rev. Pickard 

 Cambridge, who adds that this is only the second record 

 of the species since the days of Leach, the other locality 

 being on the coast of Devon). 



I was myself working- during most of the summer 

 vacation upon Molhiscan Histology, and I got several of 

 the advanced students to undertake the investigation of 

 special points in order to test and corroborate my own 

 observations. In that way Mr. Bygrave and Mr. Burlend 

 did some work on the structure of the Laniellibranek gill 

 and the currents produced by the ciliation, and Mr. Potts 

 examined for me the striped and non-striped fibres of the 

 adductor muscles and started an investigation of the 

 byssns gland which I hope lie will finish on another 

 occasion. 



Mr. C. Gordon Hewitt occupied the Victoria Univer- 

 sity of Manchester work-table during the Easter vacation, 

 and reports to me as follows : — 



" Owing to the stormy weather I was severely 

 restricted in my work on the Isopoda, as it was only 

 possible to go out to sea twice, and even then it was too 

 rough to use the small dredge. I am, however, able to 

 add two species to the known fauna of the district. 



" (1) Idothea pelagica, Leach.— A single female 



