18 Proceedings of the Biological Society of Washington, 



the primary papillse of the dorsal surface are all of the same type; in 

 medium sized and large specimens they intergrade through all stages, 

 while in small specimens certain ones are markedly prominent, these 

 papillse are very near together, but it is not rare to find between them 

 accessory papillae; crural tubercles occur on the legs of the two pregenital 

 pairs in the males. 



Distribution.— Santarem, Brazil, French, Dutch and British Guiana, 

 Trinidad and Grenada, westward to Central America, ranging northward 

 to Nicaragua, and possibly to British Honduras. 



Included Species. — 



E. barbouri (Brues) E. imlhurmi (Sclater) 



E. biolleyi (Bouvier) E. isthmicola (Bouvier) 



E. brasiliensis (Bouvier) E. nicaraguensis (Bouvier) 



E. edwardsii (Blanchard) E. simoni (Bouvier) 



E. evansi (Bouvier) E. trinidadensis (Sedgwick). 



The American species of Opisthopatus appears to be sufficiently dif- 

 ferent from the African to warrant generic recognition, and I therefore 

 propose for its reception the genus 



Metaperipatus gen. no v. 



Genotype. — Peripatus blainvillei Blanchard, 1847. 



Diagnosis. — Nineteen to twenty-one pairs of legs, those of the posterior 

 pair much reduced though always indicated; median band of the creep- 

 ing pad very large; three pedal papillae, one anterior, one posterior, and 

 one dorsal; coxal vesicles much reduced or absent; no crural glands; 

 endogenous eggs, measuring less than 100m; embryos united in groups of 

 very different ages, but in each group all are at the same developmental 

 stage. 



Distribution. — Chile. 



Included Species. — Metaperipatus blainvillei (Blanchard). 



Classification. 

 The following arrangement is proposed for the genera belonging to this 

 class: 



Family PERIPATIDiE Evans, 1902. 



Subfamily Peripatinje Evans (emended). 

 Included Genera. — Mesoperipatus Evans, 1901 ; Oroperipatus Cockered, 

 1908; Peripatus Guilding, 1825 (with the subgenera Plicatoperipatus 

 now ; Macroperipatus nov. ; Peripatus s. s. ; and Epiperipatus). 



Subfamily Eoperipatin.e nov. 

 Included Genus. — Eoperipatus Evans, 1901. 



Family PEPJPATOPSID.E Bouvier, 1904. 

 Subfamily Peripatoidin.e Evans, 1901. 



