EXPLANATION OF PLATE XXXVII. 



Typhloperipatus williamsoni^ Kemp. 



Female Reproductive Organs and Embryos. 



pjc^ X — 'The female reproductive organs, seen from below, magni- 

 fied about 8 times. A considerable portion of the 

 embryo-laden uterus is omitted. The ovary, which 

 is laid over on the right side, is attached posteriorly to 

 the pericardial floor in the mid-dorsal line by means of 

 a funiculus. The dotted line in the background indi- 

 cates the position^ in relation to the reproductive sys- 

 tem, of the body- wall and legs, the latter being 

 numbered (XI-XX) in roman numerals. 



,, 2. — Ovary of the same specimen more highly'' magnified : ova 

 are seen developing in follicles. 



J, 3. — A portion of the oviducts and uteri, with receptacula 

 seminis and ovorum, of the same specimen seen from 

 the other side (dorsal view), showing the double ducts 

 leading from the receptacula seminis. 



,, 4. — The same portions of another specinlen ; in this case an 

 incision was made in the animal before fixation with 

 the result that the ducts and receptacula extruded 

 themselves from the body-cavity and in so doing be- 

 came straightened. The first embryo in one uterus is 

 shown and it will be noticed that it is well developed : 

 the embryo found nearest the vagina in this specimen 

 was practically the same age. 



,, 5. — An early stage in the development. The blastopore is 

 open and two primitive segments are differentiated. 



,, 6. — A somewhat later stage. The blastopore is closed in the 

 middle and the germ-bands on either side are separated 

 by a ventral protrusion of 3^olk. 



,, 7. — A more fully developed embryo, bent double. 



,, 8. — The anterior portion of the same embryo in ventral view. 



,, 9. — Another embryo, scarcely more advanced than that shown 

 in fig. 7, but folded in a different manner. 



Reference Letters. 



em.^ embryo. o , ovary. 



/. , funiculus. ovd., oviduct. 



g.a., genital aperture. r.o., receptaculum ovorum. 



n.c, nerve cord. e.s., receptaculum seminis. 



ut.. uterus. 



