APPENDIX. 
This long list of Errata must be attributed to the cause adverted to in the Introduction, which rendered it impossible for 
me to correct the sheets as they were passing through the press. 
Page 282, line 21, insert the following definition of the group Oxystomata or Leucosiidea, which 
was unfortunately wanting in the MSS. when sent to the editor for press, I being uncertain 
whether the group should be sustained : — 
OXYSTOMATA or LEUCOSIIDEA. 
Carapace convex or depressed, transverse, with the antero-lateral margins arcuated or 
orbiculate, or even subglobose, or more or less oblong, with subparallel or slightly con- 
vergent margins (Dorippidse). Epistome very much reduced or rudimentary. Buccal 
cavity more or less triangulate, nearly always produced and narrowed in front, with the 
margins anteriorly convergent. The afferent channels to the branchiae enter either behind the 
pterygostomian regions and in front of the chelipedes, or, more rarely, at the antero-lateral 
angles of the palate (Leucosiidse). Branchiae six to nine (Claus). Antennules longitudinally 
or obliquely plicated. The carpal joint of the exterior maxillipedes is articulated either at 
the antero-internal angle or at the antero-external angle or at the distal extremity of the 
merus, and is frequently concealed beneath it. The verges of the male are exserted either 
from the sternal surface or more usually from the bases of the fifth pair of legs, which are 
either gressorial, natatorial, or feeble and raised upon the dorsal surface of the carapace. 
The Oxystomata constitute a large but somewhat heterogeneous group, characterised 
generally by the triangulate or narrowed buccal cavity and the position of the afferent 
branchial channels, and related on the one hand to the Oxyrhyncha through the Leucosiida;, 
and with the Anomura through the Dorippidse. This group includes among the highly- 
specialised Leucosiidse some of the most beautiful of the littoral species, and others (Calap- 
pidae, Leucosiidse) no less remarkable for peculiarity of form and structure. Matuta, in 
which genus all the legs are natatorial, is one of the best adapted for swimming of all 
the genera of Brachyura, and among the remarkable genera of the group Dorippidse are 
found the forms which inhabit the deepest ocean depths, and those which most nearly 
approach the Anomura in the structure of the buccal organs and of the ambulatory legs. 
Page 19, line 2 from bottom, for “ Mensdhium ” read “ Mensethius.” 
Page 40, line 8 from bottom, for “ Hcdmius ” read “ Halimus.” 
Page 40, line 3 from bottom, for “ Peltina ” read “ Peltinia.” 
Page 53, line 7 from bottom, for “ Ardopisis ” read “ Ardopsis.” 
Page 56, lines 27-29. This short paragraph, beginning with the words, “ The name Hyastcnus ,” should 
be placed in a footnote, and the following paragraph, which contains the enumeration 
of species of Section 2 of the genus Hyastenus , should run on after the words, “ Targioni- 
Tozzetti ” in that section. 
Page 83, line 11, for “ tenuidus” read “ tumidus.” 
Page 87, line 14, for “ rubei ” read “ ruber.” 
Page 92, line 10, for “ Parthenopoides, Miers ” read “ Partkcnolambrns, A. Milne Edwards.” 
Page 99, line 10, for “crowded” read “eroded.” 
Page 108 (footnote). In this footnote, which exhibits in a tabulated form the parallelism existing 
between the genera comprised in the subsections a and b of the typical Cancridse, the 
genera with acute finger-tips are placed in the left hand column and those with excavated 
(ZOOL. CHALL. EXP. — PART XLIX. — 1886.) Ccc 43 
