GLYPTOLITHODES CRISTATIPES. 43 
form of a laterally-compressed tooth projecting downward and forward be- 
tween the bases of the eye-stalks. Antennal scales armed with a few blunt 
spines on each margin. Abdomen with three longitudinal rows of calcareous 
plates. Internal or superior margin of carpus of chelipeds produced to a 
dentate crest. Ambulatory legs short, flattened, spineless, with margins pro- 
duced into dentated and crenated crests. 
This genus is established to receive the species provisionally referred to 
the genus Fhinolithodes Brandt in my preliminary report on the Crustacea 
of the “ Albatross”? Expedition of 1891.* Since the present memoir was sent 
to the press I have received from the United States National Museum, through 
the kindness of Mr. J. E. Benedict, a pair of Rhinolithodes wosnessenskii Brandt, 
the type of the genus Rhinolithodes. It is clear that the species described by 
me is generically distinct from Brandt’s species. In Phinolithodes the legs ave of 
moderate length, their segments subcylindrical and heavily armed with spines: 
in Glyptolithodes these appendages are very short (the meri projecting but 
little beyond the sides of the carapace), flattened, destitute of spines, their 
anterior and posterior edges produced so as to form prominent crests which 
on some of the segments are entire, on others crenate or dentate. In Riino- 
lithodes the upper part of the rostrum forms a rounded tubercle shorter than 
the lower uncinate process: in @/yptolithodes the upper part of the rostrum 
forms a conical subacute tooth, far surpassing the inferior process. The car- 
diac area in Rhinolithodes is elevated and spherical : in Glyptolithedes this area 
lies at the bottom of a deep fossa bounded by the raised portions of the 
branchial areas. On the whole, the relations between Lhinolithodes and 
Gilyptolithodes ave less close than those which exist between the former 
genus and Phyllolithodes. 
Glyptolithodes cristatipes Fax. 
Plate Vil... Figs 22, Zee 
Rhinolithodes cristatipes Fax., Bull. Mus. Comp. Zoél., XXIV. 163, 1893. 
The carapace is subtriangular in outline, its surface devoid of sete but 
covered with low squamiform tubercles ; the whole gastric area is raised into 
a conical prominence ; there is also a prominent crescentic rounded ridge on 
each branchial region, enclosing the cardiac area in a deep fossa open only 
behind. The rostrum is straight and conical, with a vertical plate projecting 
* Bull. Mus. Comp. Zool., XXIV. 163, 1893. 
