A. E. Verrill — 3farine Planar kins of New England. 499 



Bdelloura Leidy. 



Proc. Acad. Nat. Sci. Philad., vol. v. 242, 1851; Stimpson, Prodromus, p. 6, 1857. 

 BdeUura Diesing', Sitzb. der mathem-naturw., Abtheilung, Dendrocoelen, p. 518,1861. 



Body flat, lanceolate, with thin muscular edges along the middle, 

 adapted for swimming. Acetabulum nearly as wide as the body, 

 separated by a constriction. Month behind the middle. Tentacles 

 none. Ocelli two, reniform, with a front lens. Brain large, bilobed, 

 with several pairs of frontal nerves ; lateral nerve-trunks (PI. xlia', 

 fig. 8, n, n',) large, united by a posterior commissure in the acetabu- 

 lum, and by others, farther forward, behind the genital orifice. 

 Lateral gastric branches (fig. 8, g') more or less divided. Penis sim- 

 ple, conical, unarmed (figs. 8, 8a, p). A pair of female, accessory, 

 lobulated glandular organs or "uterine sacs" (fig. 8, x) is situated 

 about opposite the genital pore. Unicellular mucus-glands are pres- 

 ent. Rhabdites are wanting. Eggs are enclosed in capsules. 



The only known species is an active ectoparasite on Lhnulus, but 

 it is able to swim freely, with an undulatory, leech-like motion. 



Bdelloura Candida Girard. 



Vortex Candida Girard, Proceedings Boston Soc. Nat. Hist., vol. iii, p. 264, 1851. 



Bdelloura parasitica Leidy, Proceedings Acad. Nat. Sci. Philad., vol. v, p. 242, 

 1852; Stimpson, Prodromus, p. 6, 1857. 



Bdelloura Candida Girard, op. cit., vol. iv, p. 211, 1852. 



BdeUura parasitica Diesing. op. cit., p. 518. 



Bdelloura Candida "Verrill, Rep. Marine Invert. Vineyard Sound, pp. 634 [340j, 

 460 [166], 1873: Gissler, Amer. Nat, vol. xvi, pp. 52, 53, 1882 (egg-cases and young); 

 Ryder, op. cit., pp. 48-51; 142, 143, 1882 (10 woodcuts of egg-cases, etc.; fig. 8 is 

 reversed, head for tail), three species supposed to exist on Limulus. 



Planaria limuli Graff, Zool. Anzeig., pp. 202-205, 1879; Woodruff, Bull. Mus. 

 Comp. Zool., xxi, p. 19, 1891. 



Plate xl, figures 10, lOb; Plate xli, figure 8; Plate XLm, figure 11 ; Plate 

 XLIV, FIGURES 8, 8a. 8b. 



Body smooth and firm ; muscular system highl}^ developed ; very 

 changeable in form and very active ; usually lanceolate, or broadest 

 in the middle with the anterior end pointed. While, adhering by 

 the posterior sucker it can extend itself in every direction, at times 



Fig. 2. Bdelloura Candida. Adult, slightly enlarged. 



becoming almost linear and looking very much like a small leech 



{ Clepsine), hnt in contraction it becomes short-elliptical, oval, or 



oblong ; tlie margins are thin and often undulated in life. Posterior 



Tuans. Conn. Acad., Vol. VIII. 65 January, 1893. 



