I "^ ^-"J^-^ 



^ 

 I 



GLYPTOLITHODES CRISTATJPES. 



43 



form of a latcrally-cornpressed 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 BhinoUthodes 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 o^ RkinoUthodes wosncssensldi Brandt, 

 the type of the genus Rhinolltliodes, It is clear that the species described by 

 me is generically distinct from Brandt's species. In RhinoUlhodes the legs arc of 

 moderate length, their segments subcylindrical and heavily armed with spines: 

 in Gl^ptoUlhodes 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 Rhino- 

 Ulhodes the upper part of the rostrum forms a rounded tubercle shorter than 

 the lower uncinate process : in Ghjptolithodes the upper part of the rostrum 

 forms a conical subacute tooth, far surpassing the inferior process. The car- 

 diac area in RhinoUlhodcs is elevated and splierical : in Gli/ptdilliodes 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 RMnoUihodes and 

 GlffiMUhodes are less close than those which exist between the former 

 genus and PhfjUoUlhodes, 



► 





Glyptolithodes cristatipos Fax. 

 riale VII,, Pig. 2, 2% 2\ 2'. 



llhimliihode^ crUtaiipes Fax, Bull. Mus. Couip. Zo6l., XXIV. 1G3, 1S93. 



The carapace is snbtriangular in outline, its surface devoid of setoe 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 

 beliind. The rostrum is straight and conical, with a vertical plate projecting 



L 



* Bull. Mus. Comp. Zool., XXIV. 1G3, 1S93. 



i 



■"' 





¥ 



If 

 -[■ I 



M\ 



i 



t\ 



M^^r^C^ 



