NO. 4 



schmitt: stomatopods 



189 



raised area, there may be found a single low tubercle in advance of the 

 median notch ; otherwise, the scattered small tuberculi on the dorsal sur- 

 face of the telson are its only armature that in no way are analogous to or 

 represent the transverse row of spines carried in the Lysiosquillas having 

 dorsal spines on the telson. In L. maculata behind the scarcely elevated 

 median area there may be a small low swelling, but this in no sense is 

 tuberclelike. 



L. polydactyla has very short, stout, and somewhat curved, but never- 

 theless movable, submedian teeth or spines on the posterior margin of the 

 telson ; the intermediate and lateral teeth are somewhat smaller. Between 

 the submedian and lateral teeth either side are 2 tiny and widely spaced 

 denticles or rather spinules which arise from the under side of the telson ; 

 a single one occurs between the lateral and submedian, while the number 

 of tiny spiniform denticles on either moiety of the posterior margin be- 

 tween the movable submedian teeth is 12-13. Beneath, the telson is 

 smooth and unarmed. 



The ventral bifurcate process of the uropods of L. polydactyla is com- 

 posed of 2 stout flattened spines, of which the outer is much stronger and 

 broader and fully % longer than the inner one. 



Lysiosquilla decemspinosa Rathbun 



Lysiosquilla decemspinosa Rathbun, Proc. U.S. Nat. Mus., Vol. 38, No. 

 1766, p. 566, pi. 53, fig. 3, 1910. Kemp, Mem. Indian Mus., Vol. 

 4, No. 1, p. 203, 1913 [listed only]. 



Fig. 20. Lysiosquilla decemspinosa. a. ventral view of type fe- 

 male from Capon, Peru; b. rostral plate of same; c. ventral view 

 of telson, male, from Playa Blancas, Costa Rica (Hancock Exped. 

 Sta. 460-35, February 8, 1935) {a, b, and c magnified alike). 



