222 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
DESCRIPTION OF FIGURES. 
Plate 12 . 
Figs. 1 to 9 represent Hirudinariu blanchardi. 
Figs. 1,2. Ventral and dorsal views, respectively, of a typical large specimen, X 5. The somites 
are indicated by Roman numerals on the left; the numbers on the right are of the annuli, 
counted from the prostomium, while the symbols included within parentheses show their 
theoretical value. Theeyes and metameric sensillse are shown in heavy black, the “goblet- 
shaped sense organs” and the “conical sense organs” as small dots. Except that all of 
the goblet-shaped organs are not represented, the position and number of the sense organs 
is indicated as accurately as possible. An attempt has also been made to have the boldness 
of the lines correspond with the depth of the interannular furrows. 
Fig. 3. A semidiagrammatic view of the dorsum of the posterior end of the same specimen, X 5. The 
metameric sense organs only are represented. The dotted line across annulus xxiv «3, 
indicates its partial subdivision into two. The somites and annuli are indicated as in fig. 2. 
Fig. 4. Slightly more than the right half of somites xv and xvi of the largest specimen, X 3. The 
whole surface, dorsal and ventral, is shown as though flattened out, and every topographical 
feature of xv has been drawn with the greatest care. On xvi and on the middle portion of 
xv the color pattern of a small specimen has been plotted to show its relation to the sen- 
sillse, etc. The intensity of the black pigment is indicated by the closeness of the stippling. 
dm, dorsi-meson; in, extreme lateral margin; vm (the exact margin of the figure), the ventri- 
meson; np, nephridiopore; ind, median-dorsal; dl, dorso-lateral; dma, dorso-marginal ; sm, 
supra-marginal ; sbm, submarginal; vma, ventro-marginal; and vl, ventro-lateral sensilke. 
Fig. 5. A median dorsal jaw, X 33. Outline as seen from the right side. The teeth and papilla; are 
shown. 
Fig. 6. Transverse section of a jaw shown in outline, X 33. The cut is near the anterior end, and 
shows one of the larger denticles and the central mass of gland ducts which open partly on 
the dentigerous margin, partly on the lateral faces of the jaw. d, denticle; p, papillte; gd, 
axial mass of ducts. 
Fig. 7. Partial representation of the reproductive organs from the dorsal aspect, X 6.5. On the left 
side the first testis only is shown, and the ductus ejaculatorius is dra|> r n forward to show 
the epididymis, tl-tll, the eleven testes; vd, the vas deferens; de, ductus ejaculatorius 
(sperm sac); ep, epididymis; ps, penis sheath (atrium); ov, ovary; ode, common oviduct; 
vg, vagina. 
Fig. 8 . Outline of terminal portion of male duct, seen from the left side, X 6.5. $ , male pers; Lther 
letters as in fig. 7. 
Fig. 9. Outline of the female organs of the largest specimen, somewhat dissected, X 6. 5. lov and rov, 
left and right ovaries; gla, albumen gland; ode, common oviduct; vg, vagina; b, female 
bursa; 9 , female pore. 
Plate 13 . 
Figs. 10 to 17 represent Diplobdella antillarum. 
Figs. 10, 11. Semidiagrammatic figures of the anterior and posterior ends of the body viewed from 
thedorsum. X (about) 5. The somites and annuli with their values are indicated as in figs. 
1, 2, and 3, but the metameric sensillse are indicated by circles. On somite xiv the ventral 
sensillse are shown. Sensillse lettered as in fig. 4. 
Fig. 12. The sex pores and neighboring structures. X (about) 5. 
Fig. 13. A left lower jaw shown in outline and as a transparent object. X 56. The denticles, the 
course of the gland ducts from the central mass, and the arrangement of some of the muscles 
are shown. 
Fig. 14. Reproductive organs from above. X 6.5. The left testes are omitted, and the lettering is as 
in fig. 7, except pgl, prostate glands. 
Figs. 15, 16. Two transverse sections through the atrium. X 26. The section shown in fig. 15 is 
five sections anterior of 16. $ , male pore opening from bursa; m, median common part of 
duct opening into male bursa; mb, muscular wall of atrium; de, ductus ejaculatorius; ep, 
epididymis; pgl, prostate glands; bn, longitudinal muscle layer; cm, circular muscle layer; 
n, nerve cord. 
Fig. 17. Outline of alimentary canal. X (about) 5. The Roman numerals indicate somites, and show 
the extent of the several regions. 
Figs. 18, 19, and 20 are, respectively, nearly anterior, ventral, and right lateral views of the female 
reproductive organs of Hirudinaria javanica. X 10. Lettering as in fig. 9. 
