MARINE BIOLOGICAL STATION AT POET EKIN. 195 



Laboratory next year and complete a "Report upon the 

 Araneida of the District." 



The remarkable new green Gephyrean worm referred 

 to at p. 24 of last year's Report, has since been fully 

 described, discussed, and illustrated, in a recent part of 

 the "Quarterly Journal of Microscopical Science,"* under 

 the name of Thalassemia Lankesteri. It is in some 

 respects intermediate in its characters between Hamingia 

 arctica from Norwegian seas and Thalassemia gig as from 

 Trieste. It might have been described as a new genus 

 lying between Hamingia and Thalassemia, and forming a 

 term in the series — Echiunis, Thalassemia, the Port Erin 

 form, Hamingia, Bonellia ; but I preferred to enlarge 

 rather the genus Thalassemia for its reception. The 

 remarkable green colour (which I have called " Thalas- 

 semin ") has been discussed by Prof. Lankester in a 

 paper in the same number of the Quarterly Journal, and 

 has been contrasted with " Chsetopterin," " Bonellin," 

 and some other green tegumentary pigments. 



In connection with this new British worm (Thalassemia 

 Lcinkesteri) , Mr. Lyster Jameson writes to me : — " I have 

 found in the Dublin Museum Collection a specimen of the 

 T. gigas group (with two nephridia) from the west coast 

 of Ireland that is probably the same species as your new 

 one. I thought at first it was T. gigas, but have recently 

 procured Mailer's paper, and find it is quite different. It 

 was taken from the stomach of a Cod during the Dublin 

 Royal Society Survey. There is no trace of green colour, 

 but in a partly digested specimen that may well have gone." 



We must endeavour to obtain some more specimens of 



* On a new British Echiuroid Gephyrean, with remarks on the genera 

 Thalassemia and Hamingia, hy W. A. Herdman, F.R.S. ; "Quart. Journ. Mic. 



Sei.," December, 1897, p. 367 (with two plates). 



