DESCRIPTIONS OF TWO NEW LEECHES FROM PORTO RICO. 
221 
marginal line appears, and on the other in an example in which the dorsal markings have become 
very obscure and pale, so that the entire animal is of a nearly uniform reddish ash color. Intermediate 
examples are found. 
Alimentary Caned . — The jaws are much like those of Hirudo, conspicuous, high, short, and com- 
pressed, bearing a relatively small number (about 35) of denticles arranged in one series (pi. 13, fig. 13). 
They are much larger on the anterior part of the jaw, becoming smaller and relatively broader posteri- 
orly, where they are succeeded by several imperfectly developed ones. All of the functional denticles 
bear recurved calcareous tips'. There are no lateral papillae, but all of the gland ducts empty on the 
jaw ridge between the teeth (fig. 13). 
A very remarkable feature of the alimentary canal is the extensive development of gastric caeca. 
Each complete somite from vin to xvm contains two pairs instead of the one pair only, which is 
usual. In the more anterior of the somites named these caeca are of relatively small size and are 
irregularly developed, but in the more posterior the caeca of the two pairs are of equal and large size, 
and considerably lobed. The last caeca arising in xix, as usual in the Hirudinidx, are very large and 
extend posteriorly by the sides of the intestine into somite xxiv (pi. 13, fig. 17). 
Reproductive Organs . — Ten pairs of testes (pi. 13, fig. 14, <1— <10 ) occur in as many somites (xi to xx). 
The last are very small and terminate the sperm ducts. The latter (vd) have a narrow muscular (?) 
section in somites xi and xir. The epididymes ( ep ) are large curved masses which open into sperm sacs 
(de). The sperm sacs themselves (figs. 14, 15, and 16, de) are comparatively small, and present the 
remarkable feature of being closely bound together by muscular and especially by connective tissue 
sheaths. Moreover, they are concealed from above by a thick layer of prostate glands ( pgl) which com- 
pletely cover them dorsally, laterally, and posteriorly, and which open by numerous ducts into the 
sperm sacs themselves. In a dissection the epididymes appear to terminate in a somewhat massive 
median body which, by sectioning, is found to include the sperm ducts, as just described. The common 
median portion of the sperm ducts, corresponding to the penis sheath of most Hirudinidx , is a very 
short atrium with very thick muscular walls (mb) and a rather wide lumen lined by a somewhat 
folded epithelium ( m ). There is no indication of a long filiform penis, such as occurs in most jawed 
leeches, and while the lining of the atrium is probably eversible, it could form only a very short, rather 
wide penis. The structure of the whole region would appear to adapt it better to the production and 
placing of spermatcphores, as in Glossiphonia , rather than for copulation as practiced by Hirudo. 
The female organs are like those of Hirudo , etc. The vagina (vg) and slightly folded common 
oviduct (ode) lie to the right of the nerve-cord, ventral to which the left oviduct crosses to join the 
latter. 
Like //. blanchardi, this species is a blood feeder, as is evidenced by the presence of blood in the 
caeca, etc. A large number of specimens were collected at San Juan on January 13, 1899, and at Cagua 
on January 10, 1899. It also occurs on the American continent, as 1 have received from Professor 
Harold Heath, of Leland Stanford University, examples collected by R. C. McCregor in January, 
1896, at Panama, Colombia. The drawings of the internal anatomy were made from the latter. 
LIST OF PAPERS CITED. 
Blanchard, R., 1893. Revision de Hirudinees du Musee de Turin. Bollettino dei Musei di Zoologia 
ed Anatomia comparata della R. University di Torino, viii (1893), 1-32. 
Blanchard, R., 1897. Hirudinees du Musee de Leyde. Notes from Levden Museum, xix (1897), 
73-113. 
Bayer, E., 1898. Hypodermis und neue Hautsinnesorgane der Rbvnchobdelliden. Zeitschrift f. wis- 
senschaftliche Zoologie. lxiv (1898), 648-696. 
Castle, W. E., 1900. The metamerism of the Hirudinea. Proceedings American Academy of Arts 
and Sciences, xxxv (1900), 285-303. 
Leuckakt, R., 1894. Die Parasiten des Menschen. 2d ed. Leipzig, 1894. Bd. v. Leif., 5. 
Moore, J. Percy, 1898. The leeches of the U. S. National Museum. Proceedings United States 
National Museum, xxi (1898), 543-563. 
Moore, J. Percy, 1900. A description of Microbdella biannulata, with especial regard to the consti- 
tution of the leech somite. Proceedings Academy Natural Sciences Phila., 1900, 50-73. 
Moquin-Tandon, 1846. Monographic de la famille de Hirudinees. 2d ed. Paris, 1846. 
Whitman, C. O., 1886. The leeches of Japan. Quarterly Jour. Micro. Science, xxvi (1886), 317-41(1. 
Whitman, C. O., 1892. The metamerism of Clepsine. Festschrift zum 70ten Geburtstage R. Leuckarts 
(1892), 385-395. 
