MUSEUM OF COMPARATIVE ZOOLOGY. 189 



Rostrum curved upward, broad at base, narrowing anteriorly to form a long, 

 sharp acumen. Central part of gastric region prominent above the hepatic 

 region, from which it is separated by a deep pit. A prominent transverse ridge 

 on cardiac region, forming the posterior wall of a deep fossa. Antero-lateral an- 

 gles rounded. Second segment of abdomen armed with a median spine which is 

 curved forward ; third and fourth segments with a very prominent ridge which 

 bears an acute median tooth ; pleurae of second segment faintly tuberculate, the 

 others narrow with the external angles rounded but not truncate. Eye spine- 

 less, almost concealed by the base of the rostrum. Antennae about as long as 

 the carapace ; a conspicuous spine on the upper side of the third segment. 

 Cheliped long, tuberculate with the exception of the fingers ; chela slender, 

 fingers not gaping. Ambulatory legs tuberculate with the exception of the 

 dactyli, which are furnished with small teeth on the posterior margin. 



Length of body, 29 mm. ; length of carapace, 15.5 mm.; breadth of carapace, 

 9 mm.; length of rostrum, 6 mm.; length of cheliped, 30 mm. 



There is some variation in the length and upward curvature of the rostrum 

 among the different specimens. A female, from station 3424, differs markedly 

 from the males in having the tubercles on the carapace and appendages much 

 more strongly developed. 



Station 3424. 676 fathoms. 2 males, 1 female ovig. 

 " 3425. 680 " 1 male. 



Munidopsis depressa, sp. nov. 



Closely allied to M. hamata, but differs as follows. The cephalothorax is 

 more swollen, so that the sides of the carapace are visible below the epimeral 

 sutures when the animal is viewed from above. The median row of spines on 

 the carapace consists of a smaller number of spines (two on the gastric region, 

 one on the cardiac region, and one on the posterior margin). The spinules of the 

 lateral margin of the carapace are less developed. The depression on the cara- 

 pace involves the gastric region to a greater degree. The anterior margin of the 

 carapace is not so straight, and it is not spinuliferous. The antero-lateral spine 

 is more prominent, the eyes smaller, and the antenna? shorter (shorter than the 

 carapace). There is, moreover, no spine on the fifth abdominal segment. 



Length, 32 mm.; carapace, 19 mm.; rostrum, 5 mm.; breadth of carapace, 

 12.5 mm. 



Station 3425. 680 fathoms. 1 male. 



Munidopsis carinipes, sp. nov. 



Carapace quadrangular, flat, marked by a median tuberculated ridge on the 

 gastric and cardiac regions ; sides converging a little from front backward ; the 

 antero-lateral angles form a rounded shoulder. Rostrum broad at base, nearly 

 horizontal, sides converging near tip, which is blunt ; upper surface nearly 



