50 GLOSSOPORIDE. 



when alarmed almost as completely as the wood-louse ; and 3rd, by- 

 carrying the young attached to the belly for a considerable time 

 after their birth. The ova are not enclosed in a capsule. 



9. GLOSSIPHONIA. 



Glossiphonia, Johnson on the Med. Leech, 25 (1816). Moq.-Tandon, 



Monogr. 352. 

 Glossopora, Johnson's Furth. Observ. 48. 

 Clepsiue, Savig. Syst. Annel. 118. Cuv. Reg. An. iii. 216. Mueller 



de Hirud. Berol. 13. 17. Be Filippi in Ray Sac, Rep. 1845, 286. 



Diesing, Syst. Helm. i. 446. 

 Glossobdella, Blainville in Diet, des Sc. nat, xlvii. 262, Ivii. 564. 



Char. Body oval or pear-shaped, extensile, convex dorsally, flat 

 on the ventral surface, crisp and firm or gelatinous, of many equal 

 narrow rings, the sexual pores between the 20th and 21st, and 

 between the 24th and 25th : oral sucker small, with a semi-elliptical 

 protruded lip formed of three segments, the front segment obtuse : 

 mouth circular, furnished with a cylindrical proboscis : eyes distinct, 

 variable in number, in pairs on each side of the mesial line : segments 

 ternate : anal sucker attached in the middle, proportionably small, 

 inferior : vent round. Tenants of pure fresh waters. Incapable of 

 swimming. Do not voluntarily leave the water. Oviparous, depo- 

 siting the ova on the concave belly, or on subaquatic bodies. For 

 an account of their development see Grube's " Untersuchungen 

 iiber die Entwicklung der Anneliden." Konigsberg, 1844. 



1 . G. tessellata, soft and gelatinous, widening posteriorly, greyish- 

 green, vdth from two to six series of yellowish dots along the back ; 

 head indistinctly defined ; eyes 8, in two series converging forwards. 

 Length 18'"; breadth 5'". 



Hirudo tessulata, Miill. Verm. i. ii. 45 ; Zool. Dan. Prod. 220. John- 

 son, Med. Leech, 33. Fleming in Wern. Mem. iii. 400. 



Erpobdella tessulata, Flem. Phil. Zool, ii. 604. W. Thompson in Ann. 

 Nat. Hist. xiii. 43/. 



La Sangsue marquetee, Blainv. Diet, des Sc. nat. xlvii. 261. 



Ichthyobdella tessellata, Blainv. lib. cit. Ivii. 558. 



Erpobdella vulgaris, var. tessellata, Blainv. lib. cit. Ivii. 564. 



Clepsine tessulata, Mueller, Hirud. Berol. 21. Diesing, Syst. Helm. 

 i. 447. 



Glossiphonia tessellata, Moq.-Tandon, Monogr. 379. 



Hirudo tessellata — the chequered Leech, Dalyell, Pow. Creat. ii. 38. 

 pi. 4. f. 24-30. 



Hab. "Weedy ponds. 



Obs. A fine species remarkable for its gelatinous consistency. 

 The dorsal surface is roughish, with minute sharp granules. The 



