NO. 4 schmitt: stomatopods 185 



constituting the marginal or submarginal armature of the telson. There- 

 fore, in the key to species below, the count of the submedian denticles on 

 only one side of the median notch is given. 



Key to the Species of Lysiosquilla Known from the 

 Pacific Coast of America 



A^. Telson without a transverse row of posteriorly directed dorsal 

 spines above or anterior to posterior margin. 

 Shorter ramus of 6th and 7th thoracic limbs linear. 



B^. Telson armed above near posterior margin with a pair of sub- 

 conical blunt tubercles or low teeth, one either side of a low, 

 short, flattened, median tonguelike projection; telson itself 

 convex. 



Eyes large, stalk somewhat subtriangular, cornea not noticeably bi- 

 lobed, but median band is well marked. Rostral plate elongate tri- 

 angular, longer than broad at the base, anterolateral margins lightly 

 convex. Raptorial dactylus armed with about 18-20 teeth, including 

 the terminal one. Submedian denticles 12-13. . folydactyla, p. 187 



B^. Telson unarmed above, without prominent processes, tubercles, 

 or teeth on upper surface. 



G^. Dorsum of telson smooth, very convex, inflated to the extent 



that the true posterior margin of the telson and the spi- 



nules aiTning it, except sometimes their extreme tips, are 



concealed from dorsal view. 



Eyestalks more or less cylindrical, cornea subglobular. Rostral 

 plate transversely quadrangular oblong, about % as long on 

 median line as wide, median point a moderately produced acute 

 triangular spine or tooth, anterolateral angles a little produced, 

 almost rectangular, anterior margin slightly excavate or concave 

 either side of median projection. Raptorial dactylus with 11 teeth, 



including the terminal one. Submedian denticles 9 



decemspinosa, p. 189 



G^. Dorsum of telson more or less flattened, only moderately con- 

 vex in either direction, marginal spines or teeth not con- 

 cealed, plainly visible in dorsal view. 



Eyestalks subtriangular, cornea with transverse axis much greater 

 than longitudinal axis of stalk extended across cornea; cornea 

 bilobed and noticeably overhanging lateral margins of stalk. 



