436 A. E. VerriJl — Marine Nemerteans of Nexc England, etc. 



genital pores, can be seen a short distance from the mai'gin, both 

 above and below ; sometimes there are several in each transverse 

 row ;-at other times only two or three are visible. 



In transverse sections the great thickening of the interior longitn- 

 dinal muscular layer in the marginal areas is strongly marked. (PI. 

 XXXIX, figure 19.) 



The earliest name of this species that can be retained is apparently 

 G. lacteva (Leid)"), which was given to the white specimens tliat 

 I now regard as the young of this species. I have adopted this 

 name for the species, notwithstanding that Linens lacteiis (Mont.) 

 Mcintosh is now referred to Cerehratuhis by Hubrecht. That the 

 latter belongs to Cerehratuhtx, as here defined, I do not think |)os- 

 sible, 



A large species (C. Pocohontas) from Charelston, S. C, ver}^ 

 briefly described by Girard under tlu; name of Mechelia Pocohontas* 

 appeal's to be very similar to our species in size (3 feet long), form, and 

 color, but he states that the snout, is split vertically [by the proboscis- 

 pore], indicating that the cephalic slits join the proboscis-pore in front, 

 so that the snout, as he states, is four-lobed at the tip, which is not the 

 case in our species. (J. Lizzia', from the same place, described in 

 few words, at the same time (op. cit. p. 367), agrees with our species 

 in respect to the color, snout, and slits, and may be identical with it. 



C. striolenta [Leodes strlolenta. Girard, loc. cit.) also from Charles- 

 ton, appears to be a typical Cerehratidus, but it is a very distinctly 

 mai'ked species, having a pink body, longitudinally striped, and with 

 dark longitudinal blotches on the head ; margins pale ; length six 

 inches ; no ocelli. 



Cerebratulus Leidyi Yeniii. 



J/ecW/a, rowo, Leiily, Proc. Acad. Nat. Sci. Philad., vol. v, p. 244, 1851; Verrill, 



Invert, of Vineyard Sound, etc., pp. 336, [630] 1873. 

 ? Renieria rubra Girard, Proc. Acad. Nat. Sci. Philad., vol. vi, p. 306, 18r)4. 

 CerebratMlus roseit^YnTYxW, Check List Invert., p. 12, 1879, (»ow C. roseus {T>. C\i.) 

 Hubrecht). 



rr.ATE xxxviii, figures 2, 2a. 



Body elongated, rather slender in extension, rounded in the oeso- 

 phageal region, decidedly flattened and wider farther back, l)ut not 

 so much so as in C. lacteux and allied s})ecies, nor do the margins be- 

 come so broad and thin. Caudal papilla of moderate length, slender, 

 white, often absent, owing to injury. 



*Proc. Acad. Nat. Sciences, Philad.. vol. vi, p. 366, 1854, 



