342 AUSTRALIAN HIRUDINEA, I. 



point of difference between Glossiphonia and Semilageneta, 

 as regards the metameric significance of the papillae, is rather 

 astounding inasmuch as they are members of one family. 



Another point of interest in connection with Semilageneta is 

 the great reduction of somites which are generally visible as part 

 of the body. Here we find fourteen, instead of seven, somites 

 represented in the acetabular region. 



No eyes are present. 



The genital apertures are apparently united, the common pore 

 lying on the posterior portion of the twenty-first annulus, that is 

 the last annulus of the eighth somite. 



LITEEATURE. 

 '88. Apathy, S. - Susswasser-Hirudineen. Ein Systematischer Essay. Zool. 



Jahrb., Abth.f. Syst. Bd. iii. . 



'04. Benham, W. B. — On a new Species of Leech. Trans. New Zealand 



Inst, xxxvi. 



'06. On two new Species of Leech in New Zealand. Op. cit. xxxix. 



'96. Blanchard — Leeches from Argentine and Paraguay. Boll. Mus. Zool. 



ed Anat. Comp. di Torino xi., No. 263. 

 '97. • Zoologische Ergebnisse— Einer Reise in Niederlandisch Ost- 



Indien. Bd.iv. 

 '84. Bourne, A. G. — Contribution to the Anatomy of the Hirudinea, Quart. 



Journ. Micros. Sci. Vol. xxiv. 

 '49. Budge, J. — Clepsine bioculata, Sav. Verh. d. Naturli. Vereins Preuss. 



Rheinlande. Bd. vi. 

 '00. Castle, W. E. — The Metamerism of the Hirudinea. Proc. Amer. 



Acad. Arts and Sci. Vol.xxxv. 

 '00. Some North American Freshwater Rhynchobdellidse, &c. Bull. 



Mus. Comp. Zool. at Harvard Coll. Vol. xxxvi., No. 2. 

 '01. Dendy and Olliver — On a New Zealand Freshwater Leech. Trans. 



New Zealand List, xxxiii. 

 '71. GRUBE-Beschreibungen einiger Egel-Arten. Archiv filr Naturge- 



schichte. 

 '98. Moore, J. P.— The Leeches of the U.S. National Mus. Proc. U.S. 



Nat. Mus. Vol. xxi. 

 '46. Moquin-Tandon, A. — Monographic de la Famille des Hirudinees. Paris. 

 '94. Oka, A. — Beitrage zur Anatomie der Clepsine. Zeit. f. Wiss. Zool. 



Bd. lviii. 

 '86. Whitman, C. O. — The Leeches of Japan. Quart. Journ. Microscop. 

 Sci. Vol. xxiv. 



