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Turbellaria of the Scottish National Antarctic Expedition. II.* 

 By F. F. Laidlaw, M.A., K./.S. 



The two Polyclad Turbellaria recorded in this note were collected at the surface of 

 the sea at Station 53, St Paul's Rocks, 55' N., 29 22' \V., on December 10, 1902. 



They are perfectly typical Planocera, which I cannot distinguish specifically from 

 P. i>ellucida (Mertens). One of the specimens has the following dimensions: 

 length, 10 mm. ; breadth, 5 '5 mm. 



This individual differs from that figured by A 7 on Graff in possessing decidedly 

 fewer eyes in the groups lying over the brain ; otherwise the resemblance it bears 

 to von Graff's example is exceedingly close. 



The second specimen, which is not so well preserved as the first, is, however, 

 specifically identical with it 



Planocera pellucida is well known as a holopelagic organism, and has frequently 

 been recorded from the Atlantic. For details of the structure of this interesting animal, 

 see von Graff's account in Zeit. f. wiss. Zobl., Bd. Iv. (1892), pp. 195-200, Taf. vii. 



* For an account of llie other Turbellaria collected by the Expedition, see J. F. Geminill and R. T. Leiper, in 

 Tram. Unit. .W. E<lin., vol. xlv. (1907), pp. 819-827, reprinted in Report on Sti> //'. Itfsultg )'./;/.r,,.- ,5.1'. "Scotia," 

 vol. v. (1909), pp. 129-138. 



