BY E. J. GODDARD. 865 



proboscis in the Rhynchobdellids and the organ under discussion. 

 One marked feature in the structure of this organ is the presence 

 of abundant large capillaries beneath its epithelium, and this 

 would seem to indicate that, in all possibility, it functions as a 

 respiratory organ. It has developed a good circular musculature, 

 and, by the contraction of these muscles, water would be prevented 

 from passing backwards into the digestive tube. 



Dineta agrees with other Herpobdellids as regards internal 

 structures, such as the peculiar sinuses formed in connection 

 with the botryoidal tissue and blood-system. 



Of the various genera in this family it approaches closest to 

 Diva Indeed, it is possible that it may have to be included in 

 that genus; but, at present, considering the characters given for 

 Dina and as I have not any anatomical literature on Di7ia, I feel 

 that I am justified in instituting a new generic name. 



BIBLIOGRAPHY. 



Blanchard, R., 1894 — "Hirudinees de l'ltalie continentale et insulaire." 



Boll. Mug. Zool. ed Anat. Comp. di Torino. 

 Castle, W. E., 1900 — "The Metamerism of the Hirudinea." Proc. Amer. 



Acad. Arts and Sciences. 

 Moore, J. P., 1898—" The Leeches of the U.S. National Museum." Proc. 



U.S. Nat. Mus. xxi. 

 Apathy, 8., 1888 — " Susswasser-Hirudineen. Ein systematischer Essay." 



Zool. Jahr. Abth. f. Syst. Bd. iii. 

 Grube, E., 1871 — " Beschreibungen einiger Egel.-Arten." Arch. f. Natur- 



gesch. xxxvii. 

 Moquin-Tandon, A., 1846 — Monographie de la famille des Hirudinees. 



Paris. 

 Oka, A., 1895 — "Japanese Land Leeches." Journ. Coll. Sci. Imp. Univ. 



Tokyo, viii. 



EXPLANATION OF PLATES XXXII. -XXXIII. 



Dineta cylindrica, gen. et sp.nov. 



Plate xxxii. 

 Fig. 1.— (See Plate xxxiii.). 

 Fig.2. — Ventral view of anterior extremity. 

 Fig. 3. — Dorsal view of anterior extremity. 

 Fig. 4. — Lateral view of posterior extremity. 

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