NOTES ON THE STRUCTURE OF THE JAWS 



AND SALIVABY GLANDS OF HIRUDÜ 



MEDICINALIS 



BY 



Dr. J. M. CROOCKEWIT, 



(With Plate IX). 



Our knowledge of the jaws and especially of tbe salivary glaiids 

 of Hirudo raedicinalis bas but little proceeded siuce tbe publica- 

 tion of Brandt and Ratzeburg's »Medic, Zoölogie". 



Tbis lack was tbe more feit wben Haycraft ^) publisbed bis 

 careful researcbes on tbe remarkable secretion of these glauds. 



He came to the result tbat tbe liquid was able of preventing 

 tbe clotting of tbe blood on a very high degree. 



Many of the autbors ^} on Hirudinea mention tbe salivary 

 glands and tbe jaws, but their descriptions are generally short 



1) Haycraft. Proc. Royal Soc. London, Vol. XXXVI, p. 478. 



2) Moquin Tandon. Monographie des Hirudinées. 

 Brandt und Ratzeburg. Medicinische Zoölogie 1829. 



Vogt und Jung. Lehrbuch der vgl. Anatomie. Bd. I p. 32B. 



Ray Lankester. Observation on the microscopical Anatomy of the Leech. Q. J. mier. 

 Sc. XX, p. 313. 



Remy St. Loup. Organisation des Hirudinées. Ann. des, Sc. nat. 1884. 



Bourne. Contribution to the anatomy of the Hirudinea. Q. J. mier. Sc. XXIV, 1884 



D. Bertelli. Glandule salivari delia Hirudo medicinalis. 



Att. della. Societ. Toscana di scienze Naturale. Pisa. V, p. 285 en VI, p. 29. 



C. A. Pekelharing. Tijdschrift Nederl. Dierk. Vereeniging. 1890, bl. CXXI. 



Blanchard. Article Hirudinées in Dict. encycl. d. Sc. médicales. 



Vaillant. Histoire des Annelés marins et d'eau douce. 



R. Leuckart. Die Parasiten des Menschen. 



