MALACOBDELLA. 35 



1 . M. grossa, ovate, oblong, roughish with minute granules, flesh- 

 colour ; front emarginate ; intestine flexuous throughout. Length 

 1-2"; breadth 6'". 



Iliruclo grossa, Milll. Zool. Dan. Prod. no. 2668; Zool. Dan. i. 21. 



tab. 21. f. 1-5; copied in Encyclop. Method, pi. 52. f. 6-10. Turt. 



Gmel. iv. 70- Johnston's Introd. Conchol. 381. 

 Phylline grossa, Johnston in Loud. Mag. Nat. Hist. vii. 587. f. G7- 

 Malacobdella grossa, Moq.-Tandon, Monogr. 388. Blanchard in Ann. 



des Sc. nat. viii. 143 (1847). Dies. Syst. Helm. i. 445. 

 Monostoma Cyprina;, Mus. Leach. 



Hab. In lamellibranchiate moUusca from the coralline region : e. y. 

 Artemis exoleta, Cyprina isIancUca, and Cardium echinatum. 

 («) In Cyjirina islandica, Plymouth. — Leach. 



2. M. Valenciennaei, oblong, transparent, yellowish-white ; the front 

 subsinuate ; the intestine flexuous on the lower half only. Length 

 16'"; breadth 3-4"'. 



Hirudo grossa, Blainville in Diet, des Sc. nat. xlvii. 270. 

 Malacobdella grossa, Blainv. lib. cit. Ivii. 566, Atlas, f. 9. 

 Xenistum Valenciennsei, Blanchard in Ann. des Sc. nat. iv. 365 (1845). 

 Malacobdella Valenciennaei, Moq.-Tandon, Monogr. 389. Blanchard 



in Ann. des Sc. nat. iv. 373 (1845), viii. 143 (1847), and xii. 276. 



pi. 5. Cuv. Reg. Anim. illustr. Annel. pi. 23. f. 5. Diesing, Syst. 



Helm. i. 445. 



Hab. In Mya truncata, between the cloak and the body of its 

 tenant. Firth of Forth. 



Obs. In the 'Fauna of Liverpool,' Mr. Byerley mentions "a marine 

 suctorial species found between the branchial leaflets of Pholas cris- 

 pata," p. 99. This was probably M. Valencienncei. 



(a) Two specimens. They were in the same vial with the pre- 

 ceding. 



3. M. anceps, oblong, the front truncate, with two reddish spots on 

 the vertex ; intestine flexuous. 



Hirudo anceps, Daly ell, Pow. Creat. ii. 11. pi. 1. f. 22-25. 

 Hab. Scottish seas, Daly ell. 



Desc. " Length, when extended, nine lines, breadth three ; body 

 tapering slightly to the anterior extremity, which is obtuse. The 

 posterior extremity terminates in a sucker of considerable diameter, 

 colour wax-yellow. A waving intestine down the centre is percep- 

 tible. Two dull red specks are indistinctly seen towards the ante- 

 rior. The whole animal is of a very gelatinous aspect." — Dalyell. 



The Monopus medusicola of Gosse {Ann. Sf Mag. N. Hist. ser. 2. 

 XV. 277. pi. 8B) is not a Leech, but a Trematode worm, allied to 

 Distoma. 



D 2 



