78 = Transactions.—Zoology. 
Colour—various, greater part of body usually tinged with red but some- 
times with blue, integument thick and more or less opaque. 
Length about i inch. 
Hab. Lyttelton Harbour. On seaweed, usually at roots of Macro- 
cystis. 
This species is very peculiar in appearance and presents several points 
of interest. 
The maxillipedes are shown in Pl. IL, fig. 2d. Both the basos and 
ischios bear plates, that of the former ending in two rounded teeth, that of 
the latter rounded at the end and with its inner edge setose, the meros has 
its distal portion produced externally in a rounded lobe past the extremity 
of the carpus, the propodos has its distal and inner margins setose, the 
sete on the inner margin being minutely serrate ; the dactylos is broad, 
subtriangular, and nearly free from sete. 
The peculiar chelate character of the second pair of gnathopoda of male 
appears to be aequired only in fully-developed individuals; in smaller 
specimens they are subchelate, with the palm transverse, as shown in 
fig. 2g; intermediate forms between this and the fully-developed form 
shown in fig. 2f are also found. At first sight the carpus appears to be 
absent; I believe that it is joined on to the propodos, but the evidence of 
this is not quite satisfactory. The sixth segment of the pleon appears to 
be absent, unless the part that I have described as the basal portion of the 
last pair of pleopoda represents the sixth segment itself; if this be the case, 
the last pleopod will be represented only by a single rounded joint; in 
either case it certainly bears the appearance of being rudimentary and 
useless, 
Genus Montaguana. 
(Montagua, Spence Bate, Cat. Amphip. Crust. Brit. Mus., p. 54.) 
As the name Montagua was long ago used by Fleming for a genus of 
Nudibranch Mollusea, I have altered the name of Mr. Spence Bate's genus 
to Montaguana. 
Generic characters :—‘‘ The superior antenne are as long as the inferior, 
and not furnished with a secondary appendage. The mandibles are not 
furnished with an appendage. The maxillipedes are pediform, unguiculate, 
and without, or with only rudimentary, squamiform plates. The first pair 
of gnathopoda are small, subchelate, the coxe not developed into a squami- 
form plate. The second pair of gnathopoda are larger than the first, and 
have the coxe very large, squamiform, deeper than the body, and produced 
anteriorly, so as to cover the organs of the mouth; the propodos is de- 
veloped upon the same type as in the first pair. Thé pereiopoda are 
subequal; the coxz of the two anterior pairs are very largely developed, 
