Messrs. Hancock and Embleton on the Anatomy of Eolis. 105 



of oviduct receiving testis ; /, point of union of oviduct with sper- 

 matheca duct ; m, bifurcation of oviduct into channels going to 

 external parts ; n, short branch going to duct of mucus-gland ; 

 i', 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; i, its duct ; i' i', branch from it to 

 vaginal sac; jf, channel from exterior into vaginal sac ; k, union 

 of oviduct and testis ; /, junction of oviduct with spermatheca duct ; 

 m, termination of oviduct in duct of mucus-gland. 



Fig. 4. Portion of generative organs of E. Drummondi -. a, sac of penis ; 



b, female channel ; c', testis ; d, oviduct receiving testis ; i i, duct 

 from vaginal sac to spermatheca ; j, vaginal sac ; f, its channel 

 leading to external orifice. 



Fig. 5. Exserted penis of E. papillosa : a, penis ; b, female orifice. 

 Fig. 6. Exserted penis of E. Drummondi : a, penis; b, female orifice ; c, ori- 

 fice of penis. 

 Fig. 7. Sac of penis of E. papillosa laid open : a, cavity of sac ; b, 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 ; b, its orifice ; 



c, retracted penis ; d, testis ; e, orifice of penis. 



Fig. 9. Contents of testis : a, b, c, different appearances of cells found 



therein. 

 Fig. 10. Spermatozoa: a, from spermatheca of E. coronata; b, two more 



highly magnified from E. papillosa ; c, corpuscles associated with 



same. 



Plate IV. 



Fig. 1. a, cells of ovary containing very imperfect ova; b, c, ova in more 

 advanced stages of development. 



Fig. 2. Vascular system of E. papillosa : a, ventricle ; b, auricle; ccc c, pe- 

 ricardium laid open ; d, aorta ; e, artery to stomach ; e' e' e' e', small 

 branches to ditto; /, anterior aorta; /', posterior aorta removed 

 from body ; g, ovarian artery ; h, artery to posterior part of foot ; 

 i i i, branches to the intestine ; j, artery to generative organs ; 

 k, oesophageal branch ; I, 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 columnae ; b, portion of auricle ; c, auriculo-ven- 

 tricular valve ; d, aortic valve ; e, aorta ; f, sinus of ditto. 



Fig. 4. Heart of E. papillosa inflated : a, ventricle ; b, 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 ; ffff, 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 ; /, foot. 



Fig. 6. Transverse section of papilla of E. papillosa : a, hepatic gland ; 

 b, duct of ditto; c, large vascular canals; ddd, cellular tissue 

 around gland. 



