BRITISH MARINE TURBELLAEIA. 493 



ocular pigment in front of the otolith, and the relations of the 

 pharynx and ovaries. The latter, in his specimen, occupied a 

 position behind and not in front of, the pharynx. The extreme 

 contractility of the pharynx itself, and also of the body-wall, 

 cause, especially during compression, marked changes in the 

 position of the various organs. It is therefore possible that 

 Schmidt's figure (34, pi. iv, fig. 3) may not represent the 

 natural relations, v. Graff (53) does not mention the position 

 of tlie ovaries, upon which Schmidt laid stress. For the pre- 

 sent, therefore, and until more specimens are available, I place 

 the Plymouth specimen under Schmidt's species, with which 

 in almost all other points it appears to be identical. 



Sub-order 2— TRICLADIDA.^ 



Family PLANARIID^E. 



Genus 25.— Gunda, O. Schmidt (1860). 



58. Gunda vlvm (Oersted). 



? 1768. HiRUDO LiTTOKALis, Strom (1). 

 ? 1776. Planakia littokalis, Miiller (3). 



1844. „ ULV^, Oersted (16). 



1857-8. Procerodes ulv^, Stimpson (32a). 

 ? 1860. Planaria littoralis, van Beueden (33). 



1861. FoviA LITTORALIS, Diesing, S. B., ' Akad. wiss. Wien,' 

 Bd. xliv. 



1861. Procerodes ulv^, Diesing, loc. cit. 



1865. Planaria tjlvje, Johnston (38). 



1870. „ „ Uljanin(41). 



1878. Procerodes ulv^, Jensen (49). 



1880. Planaria tilv^, Czerniavsky (52). 



? 1880. Synhaga auriculata, Czerniavsky (52). 



1881. Gunda ulv^, Lang, ' Naples Mittlieil.,' ii. 



1887. „ „ lijima, ' Journ. Coll. Sci. Imp. Unif. Japan,' 



vol. i, part 4. 

 1889. „ „ Wendt, ' Archiv f. Naturgeschichte,' Bd. i, 



Heft 1. 



Length 3— 7 mm. Breadth -4 — 1mm. Body of uniform 



1 This sketch of the two marine Triclads of our shores will at least serve to 

 show how much still remains to be done in the group. The synonymy is very 

 difficult, and requires a thorough revision. 



