1975] 
Peck — New World Onychophora 
343 
4a. Twenty- four transverse dorsal folds to each segment, only 
slightly distinct because of numerous anastomoses and irregu- 
larities in grooves which separate them; 37 to 41 pairs of legs; 
Jamaica. Plicatoperipatus 
4b. Twelve transverse dorsal folds to each segment, separated by 
continuous grooves except at level of legs where some grooves 
usually bifurcate; 36 or fewer pairs of legs. 5 
5a. Eyeless; 22 or 23 pairs of legs; Jamaica Speleoperipatus 
5b. With eyes; 27 to 36 pairs of legs. 6 
6a. Primary papillae of dorsal surface with a quadrangular base 
separated by straight grooves parallel with axis of body, dorsal 
body folds apparently divided by grooves; accessory papillae 
usually small and few in number. Macroperipatus 
6b. Primary papillae of dorsal surface with a rounded base, dorsal 
body folds usually appearing undivided; accessory papillae with 
diverse degrees of development. 7 
7a. Primary papillae of dorsal surface with great size differences in 
all ages, some very predominant, cylindrical, the other conical, 
smaller, usually three of the smaller or accessory papillae be- 
tween two of the larger ones; the primary papillary tubercles 
separated by rather broad intervals where the accessory papillae 
occur; crural tubercles in male usually present on more than 
two pregenital pairs of legs. Peripatus 
7b. Primary papillae of dorsal surface all of one type; in medium 
or large specimens these papillae intergrading through all sizes, 
while in small specimens some are conspicuously larger, papillae 
closely set though with occasional accessory papillae between 
them ; crural tubercles in male present on only the two pre- 
genital pairs of legs. E piperipatus 
I find it difficult to separate the last two genera with certainty. 
They have been used commonly as subgenera of Peripatus sensu lato 
and this might be a better arrangement in view of their lack of 
external distinctness. A study of the integumentary papillae with 
a scanning electron microscope (Peck, in preparation) might help 
to clarify the utility of these characters in Peripatus and Epiperi- 
patus. Froehlich (1962) noted the need for a thorough review and 
revision of the complicated taxonomy of the New World onycho- 
phorans. This should be based on internal as well as superficial 
external characters. There is probably as much future work in the 
detection of synonyms as there is in finding and describing new 
species. As long ago as 1913, Clark (1913b) stated that “it is 
