Messrs. Hancock and Embleton on the Anatomy of Eolis. 105 
of oviduct receiving testis ; Z, point of union of oviduct with sper- 
matheca duct ; m, bifurcation of oviduct into channels going to 
external parts; w, short branch going to duct of mucus-gland; 
V, long branch to external orifice, being continuation of spermatheca 
duct. 
Fig. 3. Generative organs of E. coronata fully displayed : a, sac of penis ; 
b, female channel ; c, testis ; d, ovary ; e, oviduct ; /, dilated portion 
of ditto; g g, pellucid portion of mucus-gland; g\ granular por- 
tion of ditto ; A, spermatheca ; Z, its duct ; V i\ branch from it to 
vaginal sac ; j f, channel from exterior into vaginal sac ; k, union 
of oviduct and testis ; I, junction of oviduct with spermatheca duct ; 
m, termination of oviduct in duct of mucus-gland. 
Fig. 4. Portion of generative organs of E. Drunimondi : a, sac of penis ; 
6, female channel; c\ testis ; d, oviduct receiving testis; ii, duct 
from vaginal sac to spermatheca ; y, vaginal sac ; j\ its channel 
leading to external orifice. 
Fig. 5. Exserted penis of E. papillosa : a, penis ; h, female orifice. 
Fig. 6. Exserted penis of Drurnmondi : a, penis ; h, female orifice ; c, ori- 
fice of penis. 
Fig. 7. Sac of penis of E. papillosa laid open : a, cavity of sac ; h, its orifice ; 
c, penis retracted ; d, testis ; e, orifice of penis. 
Fig. 8. Sac of penis of E. coronata laid open : a, cavity of sac ; Z», its orifice ; 
c, retracted penis ; d, testis ; e, orifice of penis. 
Fig. 9. Contents of testis : a, h, c, different appearances of cells found 
therein. 
Fig. 10. Spermatozoa: a, from spermatheca of E. coronata; h, two more 
highly magnified from E. papillosa ; c, corpuscles associated with 
same. 
Plate IV. 
Fig. 1. «, cells of ovary containing very imperfect ova; Z>, c, ova in more 
advanced stages of development. 
Fig. 2. Vascular system of E. papillosa : a, ventricle ; h, auricle; ccc c, pe- 
ricardium laid open ; d, aorta ; e, artery to stomach ; d e' e' e', small 
branches to ditto; /, anterior aorta; f, posterior aorta removed 
from body ; g, ovarian artery ; k, artery to posterior part of foot ; 
i i i, branches to the intestine ; j, artery to generative organs ; 
k, oesophageal branch ; Z, branch to interior of buccal mass ; m, con- 
tinuation of aorta to mouth and anterior part of foot ; n, buccal 
mass ; o, oesophagus ; pp, anterior lateral veins going to auricle ; 
p' p', posterior ditto ; q, posterior median vein ; s s s, venous 
branches to ditto ; r, point of attachment of auricle and ventricle. 
Fig. 3. Longitudinal section of heart of E. papillosa : a, interior of ditto 
showing carneae columnas ; Z>, portion of auricle ; c, auriculo-ven- 
tricular valve ; d, aortic valve ; e, aorta ; /, sinus of ditto. 
Fig. 4. Heart of E. papillosa inflated ; a, ventricle ; h, auricle ; c, aorta ; 
d, posterior median vein receiving lateral branches ; e e, anterior 
lateral veins receiving branches, g g, from skin ; e’ e', posterior 
lateral veins ; / ///, pericardium laid open. 
Fig. 5. Section of skin of foot and side of body of E. papillosa : a a, mus- 
cular or cellular layer ; bbb, dermal layer or cutis with epithelium ; 
e, side of body ; f, foot. 
Fig. 6. Transverse section of papilla of E. papillosa : a, hepatic gland ; 
Z>, duct of ditto ; c, large vascular canals ; d d d, cellular tissue 
around gland. 
