THE EYE. 175 



Fig. 3. — Vas deferens (Clap.): /., the funnel; Ic, the ciliary tube; 

 at., the atrium; v.s., the vesica seminalis ; r. , the thickened 

 rim of outer coat of atrium, giving passage to neck of vesica 

 seminalis, and allowing eggs to pass into the oviduct; s.o., 

 the sexual orifice ; od., extremity of oviduct, enclosing i.o., 

 the intromittent orgaiL 

 , , 4. — Spermatophore. 



Plate XXXIV. 



5, 5. — Sperm-cells and spermatozoa. Of these a is, I believe, the 

 earliest condition, and shows sub-division of primitive testis- 

 cell ; 6 is a sperm polyplast, and shows the spermatoblast 

 surrounding the blastophore ; c shows a blastophore, sur- 

 rounded with spermatozoa, the result of the fission of the 

 spermatoblast ; d is probably a blastophore from which the 

 spermatozoa have become detached ; e, mature spermatozoa. 

 ■Portion of ciliary tube showing external epithelium. 

 ■Pattern formed by ciliary action in tube. 

 Glandular lining of atrium. 

 Leaf -like objects attached to atrium. 

 Ovaries : a, external cells ; h, internal ditto. 

 Cluster of mature eggs from matrix. 

 Seminal receptacles, early condition. 



Ditto, more advanced, showing muscles and epithelial coat, 

 and contents. 



Ditto, mature, and enclosing spermatophores. 

 Portion of spermatophore showing ciliary waves. 

 Egg capsule, with eggs. 



Egg from capsule : a, prepared with acetic acid ; 6, with 

 glycerine. 

 18. — Section of atrium in the line x x , Fig. 3, showing, according 

 to Claparede, a, the thick external wall ; b, the inner mem- 

 branous wall ; c, the epithelium ; the space ovd represents the 

 section of the oviduct. 



By Malcolm Poignand, M.D. Plates 35 and $6. 



THE present paper is an outline of the anatomy and physio- 

 logy of the human eye, with an occasional reference to 

 comparative anatomy. This, I trust, may prove of interest 

 to those who have not much technical knowledge. 



