ON THE BRACHYUROUS DECAPODS OF THE CAPE. 
•59 
Stirps. CANCRINA, or Arched Crabs. 
^families* 
Aberrant Groupe. 
Cancekm, M. E. 
Hind feet with claws, 
thick. 
Normal Groupe. 
Body 
'1 Xanthid.-e, M‘L. 
2 Cancrid.®, M‘L. 
J5 Eriphida, M‘L. 
r 
PoRTUNLAS, M. E. 
Hind feet dilated, andformeiT 
for swimming. Body de- 
pressed. L 
4 Portunidjs, M‘L. 
5 CARCiNiDiE, Leach. 
{ Outer lacinia of third maxillae dilated at the apex. Shell 
arched in front. 
{ Outer lacinia of third maxillae narrow at the apex. Shell 
arched in front. 
{ Outer lacinia of third maxillse narrow at the apex. Shell 
quadrilateral, or at least but little arched in front. 
C Outer lacinia of third maxillse with the inner apex emar- 
ginate. Last joint of hind feet more or less round. 
{ Outer lacinia of third maxillae with the inner apex entire. 
Last joint of the hind feet more or less acuminate at the 
apex. 
I proceed to enumerate the following Cape species, which belong to this Stirps : — 
Fam. XANTHIDiE, Mihi. 
Sub-genus. Atergatis, Dehaan. 
Sp. 6. ( — -) Atergatis compressipes, n. s. 
Descr. Atergatis testa rubra lsevi fulvo-maculatti clypeo vix quadrilobo ; clielis intus eom- 
pressis, cligitis supra carinatis extus lineis elevatis duabus iustructis, pcdibus brevibus latis 
compressis fulvo-maculatis. 
Note. The shell of this crab is about two inches long, and about twice as wide as long, of an 
oval form, very convex, and having only the branchial regions distinctly marked. The surface is 
quite smooth, of a dirty orange hue, marked with brick-red spots. Of these, one large spot, of 
an irregular form, reaches over the genital region almost the whole width of the shell. Another 
smaller spot marks the cardiac region, and the remainder of the shell is covered with small 
round spots of the same hue, which are also found on the feet. The seven-jointed abdomen of 
the female is also marked with small fulvous spots. 
The margin of the clypeus is sinuated so as almost to show four rudimentary lobes. The 
chelae at their points are blackish ; on the fixed joint there are two elevated lines on the out- 
side. The other feet are very much compressed and dilated. In other respects the characters 
are those common to all the species of the groupe named Atergatis by Professor Dehaan. 
This species is two inches long. 
Sub-genus. Chlorodius, Leach. 
Sp. 7. ( ) Chlorodius perlatus, n. s. 
Descr. Chlorodius testa rugis divisa, supra granulosa granulis albis, marginibus lateralibus 
anticis quadrilobis ; clypeo quadrilobo manibus pedibusque crassis rugosis verrucosis, clielis 
apice translucentibus, pedibus brevissimis. 
Note. This species comes very near the Chlorodius areolatus of Milne Edwards, but may be 
