THE ANATOMY AND DEVELOPMENT OF PERIPATUS NOVAE-BRITANNIAE. 43 



Figs. 10 a and 10 b. Similar views of the posterior extremity of a male, showing the 

 backwardly directed penis-like projection at the apex of which occurs the generative orifice. 



PLATE II. 



Fig. 11. Ventral view of the 4th, 5th and 6th legs of the left side of an individual 

 (I) in which each of these legs carried a peripheral nephridiopore. x 10. 



Fig. 12. Dissection ' of female from above [specimen IV]. The posterior portion of each 

 uterus is occupied by a pigmented embryo nearly ready for birth. 



a. anus. a. I. u. ascending left uterus, a. r. u. ascending right uterus, d. I. u. descending 

 left uterus, d. r. u. descending right uterus, r. rectum, r. s. receptacula seminis. s. g. rami- 

 fications of slime-glands. 



Fig. 13. Posterior portion of same. The terminal portions of the two uteri have been 

 cut across and the right uterus turned aside to the left, while the left uterus with the 

 cohering ovarial organs remains in contiguity with the rectum. 



i. intestine, n. c. ventral nerve-cords beneath which the uteri have to pass before reaching 

 the vagina. 



Other letters as in Fig. 12. 



Fig. 14. Further view of same dissection. The uteri are partially unravelled. The 

 ovary with the receptacula seminis as well as the greater portion of the ascending right 

 uterus have been removed. Some of the uterine loops caused deep indentations in the wall 

 of the gut. 



int. intestine cut across to show the left uterus passing below it. 



Fig. 15. Ovary and adjacent structures from another female (VII). The ovary is 

 attached to the pericardial septum. The ascending uteri loop round a bend of the descending 

 right uterus. Only one of the proximal oviducal coils is shown ; the other was concealed 

 below the right uterus. This specimen measured 37 mm. in length ; the uterine complex 

 extended forwards 14 5 mm. from posterior end of body. The terminal portions of the uteri 

 did not contain embryos. 



Fig. 16. Same removed from body. From a preparation in Canada balsam. The ovary, 

 1*5 mm. in length, is attached throughout its whole length to the floor of the pericardium, 

 with the exception of a short erect posterior portion with which the infundibula communicate. 

 The follicular character of the ovary is plainly indicated. The largest of the three embryos 

 shown in the uterus to the right of the figure belongs to my Stage III and its length, 

 including the chorionic membrane, was 1*1 mm. 



i. infundibula. o. ovary, p. pericardial septum (i.e. floor of pericardium), r. s. receptacula 

 seminis. 



Fig. 17. Ovary and adjacent organs of young virgin female. This specimen (XI) was 

 17 mm. in length. Only a portion of the ovary is represented. The receptacula seminis 

 were empty. The different appearance of that portion of each oviduct which precedes the 

 receptaculum seminis from the succeeding portion is to be noted. Besides communicating 

 with each other indirectly through the receptaculum seminis, these two portions of the oviduct, 

 namely, the proximal or infundibular portion and the distal or uterine portion, communicate 

 directly together by a short passage from one lumen to the other below and behind the 



G — 2 



