NO. 4 SCHMITT : STOMATOPODS 209 



Key to Species of Gonodactylus Known from the 

 Pacific Coast of America 



A^. Telson without spines or spinules on upper surface except occasion- 

 ally a small point or "bead" on the hinder end of the median and 

 intermediate carinae; submedian carinae, if indicated at all, 

 unarmed. 



Knob smooth and rounded, low. Crests of submedian teeth of telson with- 

 out spines or spinules. Ocular plates usually squarish with more or less 

 convex anterior margin, almost subcircular at times. Anterolateral angles 

 of rostral plate rounded off, not angulatedJ4 .... oerstedii, p. 211 



B^. Intermediate teeth of telson not sharply set off from submedian 

 teeth, the lobule which typically intervenes between the sub- 

 median and intermediate teeth is placed up on outer margin 

 of the submedian spine more or less wholly posterior to the 



level of the extremity of the intermediate tooth 



oerj/^6?ii with Pacific type of telson, p. 211 



B-. Intermediate teeth of telson sharply and distinctly set off from 

 submedian teeth by a sinus at bottom or apex of which the 

 lobule separating these pairs of teeth normally occurs. ''^^ . . 

 oerstedii with Atlantic type of telson, p. 211 



A-. Upper surface of telson more or less spinulose, armed with spines, 

 spinules, or prickles. 



Median, submedian, and intermediate carinae usually armed posteriorly 

 with at least one distinct spine or spinule. Crests of the submedian teeth 

 1 of telson usually armed with at least one spine or spinule, often more. 



Anterolateral angles of rostral plate angulated, subacute, acute, or at 

 times even spiniform (as in typical bahiahondensis) . 



''^4 Pacific specimens of G. oerstedii with an Atlantic-type telson have a rostral 

 plate with angulated, often nearly acute anterolateral angles. In this respect, these 

 specimens approach the west coast species of Gonodactylus with spinulose telscns, 

 so much so, in fact, that there is suggested the possibility that they may be a non- 

 spinulose form if not a distinct subspecies of one or another of these species. 



All Pacific oerstedii forms and relatives of whatever degree differ from Atlan- 

 tic oerstedii by virtue of their usually more angulated and more produced antero- 

 lateral angles of the rostral plate. The angles in Atlantic representatives of the 

 species (s.s.) are broadly rounded. 



'i'5 Rarely is this sinus reduced, but when tending in this direction the lobule 

 still definitely separates the marginal teeth and is placed so that its posterior mar- 

 gin lies anterior to the level of the posterior extremity of the intermediate tooth. 



