and Planarians of New England. 525 



been shown, many years ago, that the larvae observed by him 

 belonged to a species of Polygordlus, Nevertheless Dr. Girard pro- 

 poses to refer them to a new species of JSfareda (JV. pulchella). 



If this Polygordlus, which has not yet been described in the adult 

 state, be really distinct from those of Europe, it may retain his 

 trivial name. 



The genus or subgenus Kareda is, itself, of doubtful value, as I 

 have previously shown (op. cit., pp. 403, 404). 



/ 

 , Tetrastemma vittatum Ycr. ; Gr'd, p, 252 = Do. Ver., vol. viii, p. 411. 



Tetrastemina vermiculus Ehr. ; G-r'd, p. 253 =Do. Yerrill, vol. viii, p. 408. 



Hecate Gr'd, = Tetrastemma Ehr. 



No characters of generic value are given for this group. The 

 type is a typical Tetrastemma, so far as I can judge. 



Hecate' Candida Gr'd, p. 254=:Tetrastem.m.a candidum Ver., vol. viii, p. 404. 

 Hecate dorsalis Gr'd, p. 255=Tetrastem.m.a dorsale Ver., vol. viii, p. 409. 

 Hecate elegans Gr'd, p. 256=Tetrasteinm.a elegans Ver., vol. viii, p. 406. 

 Hecate serpentina Gr'd = Tetrastemma candidum, green var., Ver., vol. viii, 



p. 404. 

 Hecate arenicola (Verrill) ; Gr'd, p. 257==Lineus arenicola Ver., vol. viii, p. 425. 



In the original description of this form (which Girard quotes) 

 lateral cephalic slits were described. It belongs, therefore, to the 

 Schizonemertina or Rhagadocephala. 



Hecate Kelleri Gr'd, p. 257=Tetrastemma elegans Ver., vol. viii, p. 406. 



Dr. Girard has given this new and unnecessary name to the form 

 described by me, in 1875, as T. elegans. He supposes that it is dis- 

 tinct from the latter, and quotes only my original description. 

 There are no real differences pointed out by him, and none exist, so 

 far as I can see. The species is a common one, and I have examined 

 hundreds of living specimens. Although somewhat variable in 

 color, the species is easily distinguished when living. 



Poseidon Gr'd, p. 258=Lineus and Micrura {'pars.) 



There is nothing in the description of this genus to distinguish it 

 from Linens, nor from Micrura, when the caudal cirrus of the latter 

 is broken off, as often happens. The genus cannot be retained. 

 The type is a young Linens. 



Poseidon Colei Gr'd, p. 258=Lineus viridis young, Ver., vol. viii, p. 418. 



This is the type of Poseidon. It is evidently the young of a pale 

 variety of Lineus viridis. 



Trans. Conn, Acad., Vol. IX. June, 1895. 



36 



