574 CLASS II. ONYCHOPHORA. 



plateaux and western slopes of the Andes (Andean) differ in certain points 

 from the others (Caribbean). Its characters are : (1) The number of legs 

 <23-43 pairs) is variable in the same species. (2) The inner jaw-blade has 

 a diastema and a saw of denticles. (3) Legs with 4-7 spinous pads. (4) 

 Nephridial openings of legs 4 and 5 on the proximal side of the 4th pad, 

 'either attached to it or separate from it. (5) Feet with 3 (Caribbean) or 

 from 4-7 (Andean) distal papillae. (6) The genital opening is between the 

 legs of the penultimate pair. (7) The oviduct is provided with a recep- 

 taculum seminis which contains spermatozoa and has 2 ducts, and with a 

 jeceptaculum ovorum. (8) The ovary is endogenous. (9) The ova are 

 minute (-04 mm. in diameter). (10) Embryos in the same uterus of all 

 ages. (11) Unpaired part of vas deferens long. (12) Spermatophores 

 elongated and with a thick case. (13) Skin -pigment brownish and 

 affected by alcohol. (14) Legs with well-developed coxal organs. (15) 

 Crural glands on many legs in the males. (16) Accessory glands of the 

 male open separately at the sides of the anus. 



The species of this group are very constant in the characters mentioned 

 <except in those of the legs and feet. This is an interesting point considering 

 the wide area over which they range and the diverse conditions to which 

 they are subjected. 



The principal species are : Andean, ecuadorensis Bouv., Lankesteri 

 Bouv., tuberculatus Bouv., quitensis Schmarda, Cameranoi Bouv., Eiseni 

 Wheeler, etc. ; Caribbean, jamaicensis Grab, and Cock., Sedgwicki Bouv., 

 juliformis Guilding, trinidadensis Sedgw., Edwardsii Blanchard, etc. 



Congo-Peripatus. A single species, P. Tholloni, has been described by 

 Bouvier from the French Congo. It is quite distinct from the other 

 African Peripatus and must be regarded as a distinct type. Its cha- 

 racters are : (1) Number of legs (24-27 pairs) variable in the same species. 

 t(2) Inner jaw with a diastema and a saw of denticles. (3) Legs with 3 

 ; spinous pads. (4) Nephridial openings of legs 4 and 5 on the proximal 

 side of the 3rd pad and attached to it. (5) Feet with 3 distal papillae 

 '(2 in front and 1 behind). (6) Genital opening between the legs of the 

 penultimate pair. (7) Oviduct with a receptaculum seminis with 2 ducts, 

 and a receptacula ovorum. (8) Character of ovary not described. (9) 

 Ova minute, but size not determined. (10) Uterine embryos differ much 

 in age ;* those near the genital opening lie in a large uterine dilatation. 

 '(11) Unpaired part of vas deferens long. (12) ? (13) Skin-pigment 

 brownish, affected by alcohol. (14) Legs with well-developed coxal organs. 

 '(15) Crural glands in the two pairs of legs preceding the genital legs in the 

 male, open on papillae. (16) Accessory glands of the male open in front 

 of the anus in a common furrow. In addition to these characters the 

 oviducts and ovaries are completely separate from one another, a feature 

 found in no other species. This combination of characters is unique and 

 there is no reason why the species should be associated with Neo-Peripatus 

 as has been done by Bouvier. 



Eo-Peripatus. Malacca (3 species) and Sumatra (1 species). The 

 characters are : (1) Number of legs (23-25 pairs) usually variable in the 

 same species. (2) Inner jaw with a diastema and saw of denticles. 

 <(3) Legs with 4 spinous pads. (4) * Nephridial openings of legs 4 and 5 

 either in the proximal pad or proximal to it. (5) * Feet with two distal 

 papillae. (6) Genital opening between the legs of the penultimate pair. 

 (7) Receptacula seminis with 2 ducts, and receptacula ovorum are present. 

 ((8) Ovary exogenous. (9) Ova large and heavily yolked (about 1 mm. 



