Species of Lumbricus. 327 



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

 tion of parts, M-hich 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 and when so, being very speedily again withdrawn.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. PELLUcinus. 



2. L. pellucidusy immaculatus, hifariam aculcatus : aculcis longis, 



coiiicisj tion retractilibus : cingido obscuro. 



Hah. Fresh wafer ditches, amongst Lemna;, common. • 



Desc. Body 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. Anus 

 terminal and large. 



This animal differs from the L. vermkularis of Muller in the 

 habitat^ that species being represented as living amongst moist 

 and decaying wood and leaves ; and in the setw, 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. UUFESCENS. 



3. L. riifescens, uiikolor, subpellucidus, bifariatn aculcatus ; acu- 



lcis solilariisj reti^actilibus. 



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. tubifcx of Muller, as that 

 is a fresh- water species. 



