CLITELLIO.— VALLA. 



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

 Lumbricus arenarius. Mi/?. ZooZ. Dan. Prod. no. 2614. 



67 



Fabric. Faun. 



Groenl. 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. 



Hab. Between tide-marks in wet gravelly places, common. 



Besc. Body \\ inch long, or, when extended, nearly 3 inches, 

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

 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, Br. 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. III. — Valla ciliata. 



a. Worm of the natural size. 



c. Middle portion of body magnified. 



b. Anterior portion. 



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

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



F 2 



