TREE-WORMS OP GEEAT BEITATK. 295 



received from Brest, in Brittany, during the month o£ March 

 1886. It may be here remarked that in England March is an 

 excellent month for collecting earthworms, as the sexual organs 

 are then becoming active and fully developed. E-osa states tliat 

 the worms are about equal in dimensions to Lumhricus purpureus, 

 Eisen ; being from 2 to 2| millim. in diameter, and 35 to 40 in 

 length. The form is cylindrical, with the posterior part some- 

 what attenuated. Colour violaceo-pallid dorsally, carneo-livid 

 ventrally. Segments about 100 in number. Cephalic lobe or 

 prostomium with a large backward prolongation which cuts or 

 dovetails into the peristomium to about one half its longitudinal 

 diameter, the lobe being destitute of an inferior longitudinal 

 groove. The male pore situated on segment 15, and extending 

 from the second to the third setae, the two adjoining segments 

 (14 and 16) being affected. Kosa terms these papillae carrying 

 the male pore the atria, but Beddard disputes the strict accuracy 

 of this designation *. I prefer for the present to state, when 

 these glandular processes occur, that the male pore is carried by 

 or borne on papillae. The female pore is well seen, says Rosa, 

 as a small fissure on each side of segment 14 against the second 

 setae, but on the side external to that occupied by the male pore. 

 The girdle occupies six segments, extending over 31-36, slightly 

 raised and not very closely fused. The tubercula puhertatis 

 occur ventrally on segments 33, 34, in the form of a continuous 

 ridge (not on papillae as in AllolohopJiora Morotica, for example). 

 Setae distant, the lateral interval increasing from below upwards, 

 that is, the interval between 2-3 is greater than between 1-2, 

 and less than that between 3-4 ; the ventral inferior (1-1) not 

 greater than the lateral inferior (1-2) ; the dorsal interval (4-4) 

 being about twice that of the lateral superior (3-4). The setae 

 on the ventral surface of segments 31, 32, 35 (before and behind 

 the tubercula pulertatis) borne on relieved papillae. An in- 

 teresting note on the nephridiopores, which, need not be repro- 

 duced in this connection, brings Rosa's account to a close. 



In 1890 I found three specimens of this worm a few miles 

 north of Langholm, N.B., and the same year three others were 

 discovered in an immature condition near Carlisle, when they 

 were at first mistaken for the young of Luiiibricus purpureus, 

 Eisen. More recently I have received specimens from, or col- 



* " The Classification and Distribution of Earthworms," in ' Proceedings of 

 the Royal Physical Society of Edinburgh,' vol. x. p. 264. 



