236 CLAY POLE. [VoL. XIV. 
between the second and third body segments. Fabre ('55) and 
others describe the ova as developing exclusively on the ventral 
surface of the ovarian sac, which reaches back into the hind 
body segments. Two strings of ovules, “ placentaires,” extend 
throughout the length of the ovary, united to the membrane of 
the sac. Each egg is enclosed in a separate follicle, which 
eventually breaks, allowing the eggs to fall into the unpaired 
ovary, formed by the fusion of two primitively distinct sacs. 
Heathcote (ss) describes the ovary of the just-hatched /wlus 
terrestris aS an unpaired sac enclosing a double line of ovules; 
earlier there were two distinct sacs; a fusion followed. Accord- 
ing to Schmidt (94, ’95), who agrees with Grassi (’86), the ovaries 
in Scolopendrella are paired, with paired anterior outlets opening 
upon the fourth segment. Each ovum is enclosed in a distinct 
follicle. Schmidt (95) and Kenyon (95) both agree in their 
description of Pauropus, the lowest form of myriapod; they 
represent it as having an ovary of the typical diplopod type. It 
consists of a large unpaired sac lying on the median line below 
the gut, crowded with ova, the largest of which are forced 
forward and sideways, leaving a central and posterior mass 
of small ova. A small unpaired oviduct opens in the third 
segment a little to the right of the mid-ventral line. No 
evidence of double strings of these ova has been observed, but 
only mature or nearly mature females were studied. The ova 
are inclosed in follicles within the ovarian sac. 
Briefly summarizing the conditions found in the myriapods: 
in the Chilognatha the ovary is an unpaired sac, the germinal 
epithelium is placed chiefly at the hinder end of the body, and 
the developing ova pass forward through the successive seg- 
ments as they ripen. The oviducts begin usually in about the 
fourth or fifth segment and open in paired outlets on the second 
or third. It is evident that a paired condition primitively existed, 
and that the unpaired ovary is the result of fusion of two sacs. 
The primitively paired condition is still indicated by the devel- 
opment of ova in the young animal and by the paired openings. 
In the Symphyla, Scolopendrella, the paired condition persists 
in the adult, the opening appearing on the fourth body segment. 
The Pauropoda show unpaired ovaries with a cephalic, asym- 
