467 



L.M.B.C. MEMOIRS 



No. XXII. ECHINODERM LARVAE OF 

 POET EEIN. 



BY 



HERBERT C. CHADWICK, A.L.S., 



Curator of the Biological Station, Port Erin. 



The folk ^ing notes and illustrative figures are the 

 result of a ca. aful study, extending over seven years, of 

 the pelagic la:vae of Echinodermata which occur in the 

 plankton of Port Erin Bay. The work has been done 

 under some disadvantage, inasmuch as I have not had 

 sufficient leisure to enable me to study living specimens 

 as fully as I could wish. On the other hand, I have been 

 able to make a large collection of well-preserved speci- 

 mens; and, in addition to these, I have enjoyed the 

 unrestricted use of an excellent collection made during 

 successive visits to Port Erin by my friend, Mr. F. H. 

 Gravely, M.Sc, of the Royal Indian Museum, Calcutta, 

 and formerly of the University of Manchester. I gladly 

 take this opportunity of thanking him for so generously 

 placing his collection at my disposal. 



In addition to these two collections, 1 have frequently 

 examined the official tow-nettings which have been taken 

 twice weekly by the Staff of the Port Erin Biological 

 Station throughout the whole period of my study of the 

 Echinoderm larvae. 



GG 



