482 RICHARD EVANS. 



The inner blade has a diastema followed by a row of small 

 denticles. The male genital pore has the shape of a cross. 

 The ductus ejaculatorius is very long and forms a loop. The 

 male accessory glands open to the exterior by a median pore 

 situated between the last pair of legs. The female opening 

 is a transverse slit. Receptacula ovorurn and seminis are 

 present. The ovary is large, and spreads out over the other 

 organs. The ova are large, full of yolk, and exogenous. The 

 developing embryos have no kind of placental structure^ and 

 measure 20 — 27 mm. in length at birth. 



Genus 2. Peripatus: — The legs have either four or five 

 pads. The renal papillae of the fourth and fifth pairs of legs 

 are situated either on the proximal side of the third pad or in 

 the groove between the third and fourth pads. The feet 

 have a variable number of papillae; the hinder margin having 

 either one or two, while the anterior margin has from one to 

 three. The outer blade of the jaw has one or two accessory 

 teeth, the inner blade has the same number followed by a 

 diastema and a row of small denticles. The ductus ejacula- 

 torius forms a very long loop. The male accessory glands 

 (anal glands) open beside the anus into two pouches, which 

 have the same structure as the rectum. Receptacula seminis 

 and ovorurn are present. The ovary is small and compact. 

 The ova are endogenous and devoid of yolk. The young are 

 provided with a nutritive organ v/hich has been called the 

 "placenta," and measures 20 — 25 mm. in length at birth. 



Genus 3. Mesoperipatus : — The legs have only three 

 pads. The renal papilke of the fourth and fifth pairs of legs 

 make a slight indentation in the proximal pad, that is, the 

 third pad. The number of legs varies from twenty-two to 

 twenty-five pairs. The two blades of each jaw have an 

 accessory tooth on the inner side of the main tooth, and the 

 inner blade has a long row of denticles. The ridges of the 

 skin are continuous across the back. The female has a pair 

 of receptacula seminis; presumably there are no receptacula 

 ovorurn. 



Genus 4. Peripatoides : — -The legs have three pads. 



