126 Mr. F. E. Bcadanl on the 



in Megascolex cingulatus^ upon the intersegmental grooves 

 xvii./xviii, and xviii./xix., but apjiear to be rather different 

 in position, in so tar as they are not precisely above and below 

 the genital pore, but both outside of it. 



(6) Perichaeta viridis, Schm. 



Perichata viridis, Scbmarda, Xeue wirbell. Tliiere, Jjd. i. Ilalfte ii. p. 13. 

 Megascolex viridis, YaOlant, Anneles, p. 87. 



Beyond stating that this species is a true Perichfeta I have 

 no further observations to offer about it. None of the speci- 

 mens were mature, and no distinctive characters could there- 

 fore be drawn up. 



(7) Pontoscolex arenicola, Schm. 

 (Pl.Vil. figs. Sand ^) 



Pontoscolex arenicola, Schmarda, Neue wirbell. Thiere, Ud. i. Ilalfte ii. 



p. 11 (in part). 

 Pontoscolex amiicola, Vaillant, Anneles, p. 198 (in part). 



Under the same name Scliraarda has confounded two per- 

 fectly distinct species, which should perhaps be referred to 

 two distinct genera. As I have no means of knowing wliicii 

 specimen served as the type of tlie species, I shall regard 

 those individuals with a clitellura consistiuG: of ei>j:ht ses:- 

 ments as representmg the species Pontoscolex arenicola, the 

 others I shall call Diachceta littoralis. They have all the 

 same habitat, occurring upon the seashore in the neighbour- 

 hood of Kingston and Port Royal, in Jamaica. 



I suggested myself* a short time since that Pontoscolex 

 might ]3rove to be Pontodrilus^ which I have received from 

 Bermuda, where it is also found upon the seashore. This 

 supposition proves to be incorrect. The genus is in fact, as 

 Schmarda's figure would lead one to believe, identical with 

 Urochata ; one of the two species at least is referable, in my 

 opinion, to that genus. The others, those with a more exten- 

 sive clitcllum, may perhaps be more suitably placed in 

 Benliam's genus Diacliaita. 



Schmarda's diagnosis of the genus is as follows : — 



" Quatuordccim series setarum alternas binas. Clitellum. 

 Maricola}." 



In the figure illustrating this species tlie clitellum appears 

 to be shown in a very unusual position, /. e. nearer to the 

 posterior than to the anterior extremity. It is true that it is 



* " Abstract of some Investigations into the Structure of the Oliiro- 

 cha.-ta," Ann. & Mag. Nat. Hist., Jan. 1891, p. 96. 



