230 



PROCEEDINGS OF THE ACADEMY OF 



which the //. medicinalis of Europe is the type, but neverthelesa possesses pe- 

 culiarities perliaps rather more than specific. Its characters, generic and 

 specific, are as follows; 



HiRUDO DECORA. 



Say: Long's Expedit. vol. ii, 1842, Append. 268. Moquin-Tan^on : Monog. 

 Hirud. 1846, 344. Diesing : Syst. Helm, i, 1850, 474. Wood and Bache : 

 United States Dispensatory. 



Body elongated, compressed cylindroid, narrowing anteriorly, laterally sub- 

 acute ; in motion convex above, fiat below, with the margins compressed, thin, 

 acute and somewhat wavy ; composed of from 90 to 94 annuli, which are uni- 

 form and smooth. Head continuous with the body. Mouth obliquely termi- 

 nal, bilabiate ; the upper lip prominent, seraiovate, obtuse, or from contraction 

 of the tip emarginate ; lower lip forming the inferior portion of the first annu- 

 lus ; the lips together acting as an acetabulum ovoid or obcorde^ in form. 

 Eyes 10, arranged in horse slioe form, the anterior 8 above the upper lip, the 

 posterior pair separated from the others by the first annulus. Acetabulum 

 subbasilar, ventral, sessile, circular. Anus dorsal, above the acetabulum. 

 Male aperture perforating the 25th annulus, with the lips more or less promi- 

 nent. Female aperture between the 29th and 30th annuli. A group of four 

 pajjillae situated back of the latter on the 34th to the 3Gth annuli inclusive. 

 Jaws three, semicircular, laterally compressed, furnished with 55 teeth, which 

 have an acute curved summit and an expanded bilobed base. Oesophagus 

 short and narrow compared with that of Aulastomum, furnished wiih 6 longi- 

 tudinal folds, of which three coarse ones descend from the jaws and three nar- 

 row ones are intermediate. 



. Color. Dorsal surface olive green, with a median irregular band and a 

 lateral line of darker hue of the same kind ; a median row of reddish brown 

 dots, and a lateral row of black dots. Ventral surface reddish brown, extend- 

 ing slightly above the lateral margin, devoid of spots, or more or less macu- 

 lated with black. Acetabulum colored like the back above and the belly 

 below. f 



In the genus Hirudo, as characterized by Diesing, (Sj'st. Helm, i, 465), and to 

 which he assigns 9 recognized species, the jaws are furnished with from 60 to 

 70 teeth, and the male aperture is situated between the 24th and 25th seg- 

 ments. Moquin Tandon (Monog. Hirud. 1846, 326) likewise assigns the latter 

 as the position of the male aperture in the genus Hirudo. 



The position of the generative apertures in H. decora often appear more or 

 less discolored, or of a dull purplish hue, and the same is the case with the 

 group of papillae back of them. The latter do not exist in the medicinal leech 

 of Europe. They are quite conspicuous in ours. I have suspected that they 

 were provided for the adherence of individuals in sexual intercourse, and this 

 view is confirmed by Mr. S. J. Moore, the well known professional leechU 

 and bleeder of this city. Mr. Moore informs me that in copulo two individuals 

 adhere in the position of the papillre and make two turns of a spiral upon 

 each other. 



The red and blacks spots of the back contain from 20 to 22 in each row. 



Length up to 7 inches, by 8 lines in breadth posteriorly ; and the acetabu- 

 lum 3 lines in diameter. 



Notice of some remains of Extinct PACHYDERMS. 

 BY JOSEPH LEIDY, M. D. 



DiCOTYLES NASUTUS. 



Extinct Peccary. Leidy : Pr. A. N. S. 1860, 416. 



An extinct species of Peccary, obviously different from any one heretofore 

 noticed, is indicated by a_ specimen submitted to my examination by the late 

 Dr. David D. Owen. It was found in digging a well in Gibson Co., Indiana, at 

 a depth of between 30 and 40 feet. 



[Oct. 



