190 FOURTH REPORT — 1S34. 



planata and H. stagnalis of authors, and some others. Dr. 

 Jolinson has also written two treatises on the 3Iedicinul Leech, 

 to the last of which is appended a reprint of the memoirs above 

 alluded to. In the Turin Memoirs for 1820*, Professor Ca- 

 rena has published a complete monograph of the genus Hirndo, 

 in which, notwithstanding the labours of Savigny, who paid great 

 attention to this family, he has described several new species, 

 besides elucidating the history and synonyms of others known 

 before. A supplement to Carena's mojiograph will be found in 

 the twenty-eighth volume of the same Memoirs. In the ^nn. 

 des Scien. for 1825 f, M. Rayer has published some interesting 

 observations with respect to the capsules and ova of several 

 species of Hirndo, and the gradual development of the joung. 

 In 1827 appeared nearly at the same time two other valuable 

 monographs on this family, one by Moquin-Tandon J, the other 

 by Blainville §, this last being in part an extract from the Diet, 

 des Scieu. A^cif. In these works, which may serve as points of 

 departure to future observers, the history of these animals is 

 nearly complete up to the above time. In both will be found 

 considerable details with respect to their anatomy, physiology, 

 and habits, and likewise with respect to species. Of these last 

 Blainville enumerates thirty-six. Moquin-Tandon describes 

 thirty-seven, besides four which he considers as doubtful. It 

 may be stated that Derheims has also written upon this family ; 

 but Moquin-Tandon does not speak favourably of his work ||, 

 which I have not seen myself. 



The Lnmbrici, which received a large share of Savigny's at- 

 tention, and of which he has described upwards of twenty 

 species % (as he considers them), before confounded under the 

 general name of L. terrestris, have been since much attended 

 to by Leon-Dufour, Duges, and Morren. Leon-Dufour's ob- 

 servations, contained in two memoirs in the Ann. des Scien. 

 for 1825 and 1828, chiefly respect the mode of reproduction, 

 which he asserts to be oviparous, and not viviparous as sup- 

 posed byMontegre** and SirEverard Home ft . He has disco- 

 vered the capsules at the depth of five or six feet in the earth, 

 and found them analogous to those of the genus Hirudo. 

 M. Duges is the author of an elaborate memoir in the Ann. des 



* vol. XXV. p. 273. f torn. iv. p. 184. 



X Monographie de la Famille des Hirudinees, par Alfred Moquin-Tandon. 

 Paris, 1827. 4to. 



§ Essai d'une Monographie de la Famille des Hirudinees. Paris, 1827. Svo. 



II Histoire Naturelle et Medicale des Sangsites. Paris, 1825. Svo. 



i[ The characters of these species will be found in Cuvier's Analyse des Tra- 

 vaux for 1821. 



** Mem. dii Mus., torn. i. p. 242. -jf ^^I'l- Trans. 1823, p. 143. 



