PERIPATUS GUIANENS18. 155 



are placed on top of a papilla situated between the third and 

 fourth spinous pads. 



5. The papilla) situated near the mid-dorsal line are large, 

 and stand on a base line which is almost rectangular. 

 Principal papilla) alternate almost regularly with accessory 

 papilla). On the flanks the latter become broken up into 

 several small ones, which occupy the spaces between the 

 primary papilla^. 



6. The female is possessed of receptacula seminis and 

 ovorum. 



7. The ova are small, devoid of yolk, and endogenous. 



8. The embryos in the uteri are in successive stages of 

 development. 



9. The male has an elongated common duct, and on the 

 twenty-second pair of legs has two pairs of sexual papillae. 



lU. The outer blade of the jaw has one accessory tooth. 

 11. The inner blade of the jaw has one accessory tooth, 

 followed by a diastema and a row of ten or eleven denticles. 



Concluding Remaeks. 



On referring to Mr. k5edgwick\s monograph on the Peri- 

 patidas we find that he examined fourteen specimens col- 

 lected by Mr. Sclater in the Pomeroon. Of these fourteen 

 specimens he states that seven had thirty pairs of appendages, 

 six had thirty-one, and one had twenty-seven. Out of 

 thirteen embryos examined seven had thirty pairs and six 

 had thirty-one. Of the four embryos taken from the one 

 with twenty-seven pairs, three had twenty-seven and one had 

 twenty-eight. In a foot-note, though not regarding it as 

 probable, Mr. Sedgwick admits that the specimens with thirty 

 pairs may be specifically distinct from those with twenty- 

 seven and those Avith thirty-one.^ In consequence of this 

 uncertainty ho included all the specimens under one specific 



1 "A Monograpli oil tlie Speciesand Distribution of the Genus Peripatus 

 (Guildiug)," 'Quart. Journ. Micr. Sci.,' vol. xxviii, N.S., pp. 431 — 494 

 pis. 34-40. 



