and Plananans of JSFeio England. 531 



Meckelia atra Gr'd, p. 291=Cerebratulus ater Ver. 

 This is known only from Florida. 



Meckelia Pocoliontas Gr'd (1853), p. 291=:Cerebratulus lacteus (Leidy, 1851) 

 Ver., vol. viii, p. 436. 



It is not necessary to confound the name of this species with that 

 of the Lineus lacteus (Mont., 1805), nor with that of Micrura lactea 

 (Grube, 1855), though the latter has sometimes been referred to 

 Cerehratulus. The name of the latter is also of later date than that 

 given by Leidy to our species. 



Meckelia lactea Gr'd, p. 293= preceding species. 



Mr. W. R. Coe has shown that the color of this species varies 

 according to the development of the sexual products. The white 

 and pale individuals are those that are without sexual products, either 

 owing to immaturity, or to the season of the year. This vol., p. 504. 



Meckelia rosea Gr'd, p. 294=Cerebratulus Leidyi Ver., vol. viii, p. 436. 

 Meckelia Lizziae Gr'd, p. 294=Cerebratulus lacteus Ver., vol. viii, p. 433. 

 Meckelia lurida Gr'd, p. 295=:Cerebratulus luridus Ver., p. 440. 



The total number of east-coast Nemerteans enumerated by Dr. 

 Girard is 55, but of these one is a Polygordius and 16 are synonyms, 

 leaving but 38 true species, of which 5 are southern, and not known 

 north of Cape Hatteras. In my paper in vol. viii. of these 

 Transactions, 50 species are enumerated from north of Cape Hatteras, 

 of which 17 are not given by Dr. Girard. Mr. W. R. Coe, in the 

 preceding article, has added three others : viz, Carinella pellucida, 

 Parapolia aiirantiaca^ and Vcdencinia rubens. I understand that 

 Prof. McMurrich has observed at Wood's Holl a species parasitic on 

 Platyonichus ocellatus^ which is probably related to the Emplecto- 

 nema carcinophila (KolL) of Europe. I have also anew species of 

 Mierura to add to the list. Hence the total number of east-coast 

 species of Nemerteans, hitherto discovered, is about 60, including 

 two pelagic species. 



Description of a neio species of Micrura. 



Micrura caeca, sp. nov. 



Body long, slender, subterete anteriorly, somewhat flattened pos- 

 teriorly, tapering very gradually to the posterior end, and somewhat 

 narrowed toward the head, which is not distinct from the body. 



