44. PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 120 
DIFFERING FEATURES.—Features serving to distinguish between 
the two forms are tabulated as follows: 
lateral Soni last anterolateral granulated areas male abdomen male pleopod, 
tee teeth of carapace under surface 
Form I Directed Relatively Conspicu-  Penulti- Row of 
forward straight ous, mate spinules 
or in- coarsely segment extending 
ward granular, either a long 
but some- slightly way back 
never times tu- or dis- from the 
outward; berculate tinctly tip 
tips longer 
acute or than 
bluntly broad 
rounded 
Form II Directed Slightly Relatively Penulti- Row of 
outward; curved or incon- mate spinules 
tips rec- sinuous; spicuous segment only ex- 
tangularly slightly and less as broad tending a 
rounded back- coarsely as long short dis- 
wardly granular, tance 
directed not tu- back from 
berculate the tip 
These features are not thought sufficiently weighty to merit specific 
separation for the following reasons: 
a. One of the smaller specimens of form II (Sta. 5169) (fig. 9h) 
has frontal teeth intermediate between those typical of this form (see 
fig. 97) and a specimen of form I from Western Australia (see fig. 9g). 
b. The proportions of the penultimate segment of the male 
abdomen vary in form J, and little extension of the range would 
encompass form IT. 
c. There are insufficient mature males of form II (only two) to 
establish that minor differences between the very similar pleopods in 
the two forms are not due to variability. 
d. Milne Edwards’ original description included some features 
of form I and some of form II, and seems to bridge most of the gap 
between them. Partial examination of his damaged specimens tends 
to confirm this bridging. The features of form I, including one or 
another of its variants, are: ‘‘Carapace trés-fortement bosselée” and 
‘“‘Aneles postérieurs de la carapace aigus et spiniformes.” The fea- 
tures of form II are first, ““Cornes laterales trés-grandes, trés minces 
et légérement dirigées en arriére,’’ and second, obtuse lateral frontal 
teeth. 
It should be noted that Milne Edwards’ figures (pl. 33, figs. 3, 3a) 
show differences from both forms as follows: 
a. The posterior anterolateral granulated patch is shown as 
almost the same size as the anterior. 
