34 Bulletin, Vanderhilt Marine Museum, Vol. II 



joint of the peduncle, which is narrowed distally and has its outer 

 lateral margin oblique, while that of alba is squarish. 



The first maxillipeds are slender with a weak subchela, formed by 

 the laminate, oval, pedunculate article which is furnished with a 

 brush of setae along its anterior margin; the terminal segment is a 

 slender curved claw, fitting upon the preceding article and forming 

 a chela. 



The second maxillipeds form a large retrochela which folds along 

 the lateral margin of the carapace and forms a sort of sidewall when 

 closed. The merus is elongate with its lower lateral margin carinate 

 and its upper lateral margin with a deep concavity distally in which 

 there is a nodular tubercle; the carpus is small and is curiously 

 jointed to the propodus and is short, rounded ; the propodus is as long 

 as the merus upon which it is reflexed and has its outer surface 

 smooth, its inferior margin armed with a continuous row of small 

 denticles and with five sheath-like pockets on its inferior margin for 

 the reception of the claws of the dactyl ; there are three slender, acum- 

 inate, articulated spines on the inner lower proximal margin of the 

 propodus. The dactyl is slender with a curved apex and armed with 

 four slender curved teeth on its inner margin, which fit into the 

 glove-finger-like apertures on the margin of the propodus. 



The third maxillipeds and second and third thoracic legs are similar 

 and subequal; weakly chelate; the propodus laminate, widely oval, 

 with a fringe of bristly setae along its lateral margin; the dactyl is 

 slender, curved, acuminate, folding upon the anterior lateral margin 

 of the propodus. 



The third, fourth and fifth thoracic legs are slender, stick-like, four- 

 jointed, each with a cane-like epipod. 



The abdominal pleopoda are very powerful. 



Synonymy: Squille mantis DeGeer, Mem. pour servir a I'hist. des 

 Insectes, vol. VII, p. 533, 1778. 



Squilla mantis Latreille, Hist. Nat. Crust., vol. 6, p. 278, pi. Iv, fig. 

 1, 1802; Encycl. Meth. Hist. Nat., vol. X, p. 471, 1825; Atlas, 

 pl. ccxcv, figs. 1, 7, and pi. ccxxiv; Cuvier, Regne Anim., vol. 

 4, p. 108, 1829 ; Lamarck, Hist. Anim. sans Vert. vol. v, p. 187, 

 1818; Eisso, Hist. Nat. Europ. Merid., p. 5) 1826; H. Milne 

 Edwards, Hist. Nat. Crust., vol. 2, p. 520, 1837 ; Crust, in Cuvier, 

 R. A., ed. 3, Atlas, pl. LV, fig. 1 ; White, List Crust. Brit. Mus., 

 p. 83, 1847. — Lucas, Anim. Artie, in Expl. Algerie, vol. 1, p. 50, 



