DESCRIPTIONS OF TWO NEW LEECHES FROM PORTO RICO. 
219 
There are eleven pairs of testes ( 1 1 -t 11) resting on the ventral longitudinal muscles on each side of the 
nerve cord and immediately behind their corresponding ganglia. The sperm ducts (vd) lie on the 
floor of the body just external to the testes, and, owing in part to the contraction of the body, are 
greatly convoluted. At the posterior end they extend beyond the last pair of testes as short, blind 
tubes, but a sufficient number has not been dissected to show that this is a constant feature. At the 
anterior end the ducts become much smaller, less glandular, and less convoluted. In somite xi they 
bend back on themselves and immediately become wide, irregular, closely convoluted tubes, forming 
rather compact masses, the epididymis (ep). At their posterior end these again pass into the small 
ends of the conspicuous fusiform, muscular-walled sacs, the ducti ejaculatorii, or sperm sacs ( de ). 
Finally the two sperm sacs unite in a common penis sheath (figs. 7 and 8 ps. ), which is a thick, 
muscular, pyriform sac bent sharply forward on itself and attached to the ventral body wall at the 
male orifice. There is a long coiled-up penis, but in no cases was it found to be protruded. Prostate 
glands are scarcely evident, only a few solitary unicellular glands opening into the bulb of the penis 
sheath. 
The peculiarities of the female organs (pi. 12, figs. 7 and 9) have already been mentioned in the 
generic description. The vagina ( vg ) is cylindroid in younger specimens, but becomes much enlarged 
at the blind end, with a relatively narrow neck (fig. 9) in fully mature examples, in which also it may 
become doubled on itself. The two “ovaries” (ov) lie about equidistant from the middle line and 
their ducts empty into a common oviduct with a small albumen gland ( gla ). The common duct is 
short and folded into a compact coil which is bound to the anterior wall of the vagina, with which it 
opens, but by a separate orifice, into a small and probably eversible female bursa (b). 
The female organs of H. javcinica are shown on pi. 13, figs. 18, 19, and 20. The specimen, 
although much larger than that from which fig. 7 was drawn, is much less mature. The structure 
of the organs is in every respect similar. The vagina is marked by longitudinal wrinkles and it pro- 
jects upward almost vertically from the ventral body wall, carrying the nerve cord with it. 
Several specimens (about fifteen ) of various sizes were taken from a bottle labeled ‘ ‘ Cagua 1-10-99. ’ ’ 
DIPLOBDELLA, gen. nov. 
The leech for which this genus is proposed belongs to the monostichodont Hirudinidse and differs 
in several respects from all members of this group whose internal anatomy has been described. The 
sperm ducts of the two sides remain entirely distinct almost to the external orifice, with which they 
are connected by a very short canal. There is no definite and distinct penis sac, and if the common 
canal is eversible at all it can form only a very short penis. There is a remarkable development of 
gastric creca, most of the complete somites as far back as xvm having two pairs in place of the one 
usually present. These are always very obvious and the two pairs are of equal length in some of the 
postgenital somites. There is frequently a tendency for most of the annuli to become faintly 
subdivided. (See pi. 13.) This disposition toward the doubling of organs has suggested the name. 
The nearest ally of Diplobdella known to me appears to be Philobdella Verrill. This genus has the 
sperm ducts similarly separated almost to the external orifice, the prostate glands very large, the jaws 
high and few toothed, and the color pattern similar. But it differs in the complicated copulatory 
glands and pits, in the much simpler lobing of the stomach, the form of the ovaries and vagina, and, 
in the known species, in the location of the sex pores and some details of annulation. Macrohdella 
Verrill possesses the two pairs of gastric cseca per somite, but the male reproductive organs are quite 
dissimilar. 
None of the numerous descriptions of Hirudinidse from South and Central America, etc., appear to 
fit the type species, which is therefore described as 
Diplobdella antellarum, sp. nov. 
Diagnosis. — The sex pores are separated by 3J rings, the male being situated at the female at 
the middle of xii 55. There are about 35 denticles on each jaw. Annulus xxvi al is developed at 
the margins. Annulus iv «3 is frequently imperfectly differentiated. The colors are plain ventrally, 
longitudinally striped above. 
External Characters. — When fully extended this leech is slender and the sides of the body nearly 
parallel for a long distance, as in a nephelid; when strongly contracted, which is the state of most of 
the specimens, the body is nearly elliptical with bluntly rounded ends. Whether contracted or 
