506 A. E. Ve.(,rUl — Marine Planar lans of JVeio England. 



The synonymy of tlie European species is still doubtful, for some 

 European authors refer the Planarla littoralis Miiller to this genus, 

 while others consider it identical with Procerodes xdvm CErsted sp. 

 As Midler's species is doubtful, I have preferred to adopt a later 

 name, which appears to be applicable to our American form. 



Procerodes Girard. 



Procerodes Girard, Proc. Bostou Soc. Nat. Hist., vol. iii, p. 251, 1850; Stimpson, 

 Prodromus, p. [5] 23, 1857; Diesing, Rev. Turbell., Dendroccelen, pp. 491, 520, 

 1861 ; Jensen, op. cit., p. 74. 



Size small. Body convex, thickened, more or less oblong. Head 

 obtuse, somewhat wider than the neck. Tentacles two, near to, but 

 distinct from, the antero-lateral margins of the head. Eyes two, 

 well developed, situated just behind the tentacles, furnished with a 

 transparent front lens, directed antero-laterally, and a reniforra, pig- 

 mented retinal portion. Pharynx long, cylindrical. Mouth sub- 

 median, or in advance of the middle of the body. 



Owing to the dark color and opacity of my specimens, when 

 living, I was unable to observe the structure of the reproductive 

 organs, nor did I ascertain positively whether the intestinal branches 

 were chiefly simple or branched, but they appeared to be forked, or 

 bilobed, in many cases, at least. My specimens are all mounted in 

 balsam, so that sections cannot well be made, at present. The 

 mounted specimens are very dark. 



Procerodes ulvae ((Ersted) stimp. 



Planaria ulvce (Ersted, Kroyer's Naturh. Tidssk., iv, p. 550, 1844; Diesing, Syst., 

 vol. i, p. 205, 1850. 



Procerodes Wheatlandii Girard, Proc. Boston Soc. Nat. Hist., iii, p. 251, 1851; 

 Stimpson, Prod., p. 6, 1857; Diesing, Revis. Turbell., Abtheil., Deudroc, p. 520, 

 1861 ; Verrill, Invert. Vineyard Sd., etc., p. 633 [339], 187.3. 



Procerodes ulvce Stimpson, Prod., p. 6, 1857 : Diesing, Kevis. Turbell., p. 521 ; Jen- 

 sen, Turbell. Lit. Norvegiffi, p. 74, 1878. 



Planaria frequens Leidy, Marine Invert. Fauna of Rhode I. and New Jersey, p. 

 11, 1855, in Journ. Philad. Acad. Nat. Sci., ser. 2, vol. iii, p. 14. 



Procerodes frequens Stimp., op. cit., p. 6; Diesing, Rev. Turbell., p. 521; Verrill. 

 op. cit., p 325 [31]. 



Pl.\te xli, figure 10; Plate xlii, figures 11, 11«. 



Body, in ordinary extension, oblong-oval, rather wider posteriorly 

 than anteriorly, broadly rounded at the posterior end, convex dor- 

 sally and flattened beneath; the neck narrows decidedly in normal 

 extension. Head distinctly wider than the neck, rounded in front. 



