﻿18 Proceedings of the Royal Physical Society. 



these forms turning np within the seaward limits of this 

 area. Another possible addition is O'phiura rohusta (Ayres).^ 

 Further attention might with advantage be given to the 

 Holothurians. 



Considerable changes in nomenclature have taken place 

 since Leslie and Herdman's list was published five-and- 

 twenty years ago ; and for this reason, as well as for the 

 incorporation of the fresh data, a revised list seems desirable, 

 I have therefore prepared one, which it is proposed to 

 publish separately, on the basis of Jeffrey Bell's Catalogue 

 of the British Echinoderms, 1892. 



PLATYHELMINTHES. 



(TURBELLARIA, TrEMATODA, CeSTODA.) 



From a popular we pass on to an unpopular, and con- 

 sequently much neglected group. The Flat-worms, as a 

 whole, have never been systematically sought for here, and 

 records are few and scattered. As a field for further in- 

 vestigation, few groups are more promising. 



TuRBELLARiA. — Sir John G. Daly ell's classical observations 

 on the habits and life-histories of Planarians, both fresh- 

 water and marine, were made in this district,- but many of 

 his species — among them Planaria edinensis from " the dis- 

 charge from the Well-house Tower, near the castle of 

 Edinburgh" — cannot now be identified, at anyrate with 

 certainty. On this point von Graff's Monographie d. 

 Turhellarien, 1882, etc., aud F. W. Gamble's " Contribution 

 to a Knowledge of British Marine Turbellaria," 1893,^ should 

 be consulted. Dr Mobius, in his Eeport on the " Vermes " 

 obtained by the German North Sea Expedition, records the 

 Poly clad Leptoplana atomata (Mlill.) from near the Bass 

 Eock, and in November 1905 I found half a dozen examples 

 of L. tremellaris (Miill.) {PL fexilis, Dalyell) under a stone 

 between tide-marks at Morrison's Haven. To the land and 



^ Of. Hoyle, Proc. Boy. Phys. Soc, viii. and x., for distribution of British 

 Ophiuroidea and Echinoidea. 



2 ' Observations on some interesting Phenomena in Animal Physiology, 

 exhibited by several species of Planarise/ Edin., 1814; and 'Powers of the 

 Creator,' ii., 1853. 



3 Qiuirt. Jour. Micr. Sci., xxxiv. (n.s.) pp. 433-528, 1893. 



