species ofLumbricus, 327 



some part of the body, the commencement probablj of a separa- 

 tion of parts, which may eventually become new individuals. 

 The lateral spines are seldom obvious, being rarely protruded, 

 and when so, being very speedily again withdrawn. We certainly 

 have never been able to perceive more than one series on each 

 side. 



2. L. PELLUCIDUS. 



^. L, pellucidus^ immaculatus^ bifariam aculeatus : aculeis longisy 

 conicis^ non retractilibus : cingulo obscuro. 



Hab. Fresh water ditches, amongst Lemna3, common. 



Desc. Bodi/ four or five lines long, very slender, filiform, per- 

 fectly transparent and uncoloured, but marked with a large tor- 

 tuous intestine which is seen running from one extremity to the 

 other. Along each side is a row of long bristles which are appa- 

 rently not capable of retraction. Head a little pointed. Jlnus 

 terminal and large. 



This animal diiFers from the L. vermicularis of MuUer in the 

 habitat, that species being represented as living amongst moist 

 and decaying wood and leaves; and in the setce, which in ours 

 are non-retractile. Muller also would surely have mentioned the 

 great comparative length of these setce^ had his species possessed 

 them, 



3. L. RUFESCENS. 



3. L, rufescens, unicolor^ subpellucidus^ bifariam aculeatus; acu^ 

 lets solitariisj retractilibus. 



Hab, The roots of the largest Fuci. 



This species exactly resembles both in shape, colour, and 

 motions a small earth-worm. When extended it is upwards of an 

 inch in length, tapered towards each extremity, round, annulate, 

 with a very short spine on each side of every ring, which is visible 

 only when the animal is contracted. The colour is reddish-brown, 

 and pellucid, so that the tortuous course of the intestine is appa- 

 rent. The anal segment is rather abruptly narrowed, and scarcely 

 emarginate. 



We cannot refer this animal to the L, tubifex of Muller, as that 

 is a fresh-water species. 



