CLITELLIO. — VALLA. 



G7 



1. C. arenarius. (Fig. No. II.) 



Lumbricus ai-enarius, Mull. Zool. Dan. Prod. no. 2614. Fabric. Faun. 



Granl. 280. 

 Lumbricus lineatus, Johnston in Zool. Journ. iii. 329 ; and in Loud. 



Mag. Nat. Hist. viii. 259. f. 24. 

 Lumbricus littoralis, Dalyell, Pow. Great, ii. 139. pi. 17. f. 17, 18. 

 Clitellio arenarius, Savig. Annel. 104. 



Hal). Between tide-marks in v,'et gravelly places, common. 



Desc. Body l^ inch long, or, when extended, nearly 3 inches, 

 slender, slightly narrowed towards each extremity, of a fine pelhicid 

 red colour, or clear white, marked longitudinally with the red zigzag 

 vessel, and often blotched with white and dusky spots from the in- 

 terranea. Head pointed, the mouth in a sinus underneath. Seg- 

 ments longer than their diameter, bulged a little in the middle where 

 the fascicles of spinets are inserted. Spinets very short, not half the 

 diameter of the body, colourless, curved like an italic y*; there are 

 two only in the front and anal segments, and four where most deve- 

 loped (No. I. fig. 3). On the ventral surface of the 8th or 9th seg- 

 ment there is a pair of mammiform bodies surmounted with a minute 

 tubular pap (penis) ; and this and the two or three adjoining seg- 

 ments are white and thickened so as to constitute a clitellus. Anal 

 segment emarginate. There is a blood-vessel on each side of the 

 intestine. When contracted the sides of the worm are minutely 

 crenulate. 



(a) Berwick Bay, Dr. Johnston. 



5. VALLA. 



Char. Lumbriciform, the body acephalous, distinctly annulated, 

 flattish on the ventral aspect : first segment pointed : mouth inferior : 

 segments crenulate, armed with setaceous bristles (No. I. fig. 5) in four 

 fascicles ; a segment (genital ?) among those of the anterior portion 

 of the body furnished with stout spines (No. I. fig. 4) in two fascicles : 

 anus terminal, naked. Littoral*. 



No. in. — Valla ciliata. 



a. Worm of the natural size. 



e. Middle portion of body magnified. 



b. Anterior portion. 



* M. de Quatrefages would place this genus among the AnneUdes errantes, pro- 

 bably in the family Ariciadae. — Souv. d'un Naturaliste, ii. p. 436. 



