MUNIDOPSIS CAEINIPES. 97 



Munidopsis quadrata Fax. 

 Pkde XXIIL, Fig. 1, T, 1\ r. 



Munidopsis quadrata Fax., Bull. Mus. Comp. Zobl., XXIV. 188, 1893. 



Elasmonotus quadratus A. M. Edw. et Bouv., Ann. Sci. Nat., Zool., 7™= Ser., XVI. 2S1, 282, 189i. 



Carapace quadrangular, the anterior and lateral margins forming a right 

 angle ; upper surface Hat, spineless, but furnished with low squamous tuber- 

 cles. Rostrum curved upward, broad at base, narrowing anteriorly to form 

 a long sharp acumen. Central part of gastric region prominent above the 

 anterior branchial lobes, from which it is separated by deep pits. A promi- 

 nent transverse ridge on cardiac region forming the posterior wall of a deep 

 fossa. Antero-lateral angles 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 spineless, almost concealed by the 

 base of the rostrum. Antenno3 about as long as the carapace ; a conspicu- 

 ous spine on the upper side of the third segment. Cheliped long, tubercu- 

 late, 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 their posterior margins. 



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

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



There is some variation in the length and upward curvature of the ros- 

 trum among the different specimens. A female from Station 3424 (Plate 

 XXIIL, Fig. Y), 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 fem. ovig. 

 " 3425. 680 " 1 male. 



Munidopsis carinipes Fax. 

 Plate XXIV., Fifj. 1, 1% T. 



Munidopsis earinipus Fax., Bull. Mus. Comp. Zool., XXIV. 1S9, 1893. 



Elasmonotus carinipes Alcock, Ann. Mag. Nat. Hist., 6tli Ser., XIII. 333, April, 1894. 



A. M. Edw. et Bouv., Ann. Sci. Nat., Zool., 7*™ Ser., XVI. 281, 282, May, 1894. 



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

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



