2 8o NATURAL HISTORY BULLETIN. 



GEO ARC IN I D^. 



94. Gecarcinus lateralis {Freminville). 

 Tortugas. 



95. Cardisom.y guanhumi Latreille. 

 Spanish Wells, Bahamas. 



PALICID^. 



96. Palicus dentatus {A. Milne Edwards). 

 Station 41, off Sand Key, 15 fathoms. 



97. Palicus bahamensis Rathhun. PI. ix, Fig. 2. 

 Bahama Banks. 



The specimens collected by the University Expedition differ 

 from the type in the shorter and blunt lateral teeth, in the 

 less prominent posterior ridge, in the coarser and more even 

 granulation of the carapace, and the thicker and blunter den- 

 ticles of the anterior margin of the meral joints of the legs. 

 These denticles, however, have a tendency to become sharp 

 and curved at the tip in some specimens. In spite of 

 these differences I refer these specimens to bahamensis on 

 account of the similarity in general characters, the shape of 

 the front and orbits, the arrangement of abdominal and sternal 

 plates, the shape of the chelipeds and ambulatory legs. Cheli- 

 peds of small specimens agree with those of the type which 

 is similar in size. In large specimens the chelipeds of the 

 male are more unequal; manus very deep, coarsely granulate, 

 upper surface tuberculate, lower margin nearly straight. 

 Pollex longer and dactylus less deflexed than in the first form 

 of the male of P. alternatus. Left cheliped very weak, fin- 

 gers slender, deflexed. Chelipeds of female similar to the left 

 cheliped in the male. A female of the form above described 

 was taken by the " Blake " off Barbados. 



Dimensions. — Male, length of carapace 8, width 9, length 

 of second ambulatory leg 18, length of merus of same 5.2, 

 carpus 3.2, propodus 4.3, dactylus 4.3. Female, length of 

 carapace 7-5> width 8.8 mm. Small specimens are propor- 

 tionally wider than large. 



