T. '08. 



129 



Leander squilla (p. 132). \Palaemonetes varians (p. 132). 



Eostrum trending slightly 

 upwards at apex, without 

 chromatophores . 



Eostrum armed dorsally 

 with seven to ten teeth^", 

 which extend well into the 

 distal third ; two posterior 

 teeth situated on the carapace 

 well behind the orbital notch, 

 the third tooth either imme- 

 diately over the orbital notch 

 or slightly behind it. 



Eostrum armed ventrally 

 with three, very rarely with 

 two or four, teeth. 



Shorter ramus of outer an- 

 tennule fused to the longer 

 for about two-fifths its length. 

 Both free rami and from one- 

 third to two-thirds of the fused 

 portion extending beyond the 

 apex of rostrym. 



Antennal scale widest bas- 

 ally, its outer margin slightly 

 convex. 



Mandibular palp two- 

 jointed. 



First pair of pereiopods 

 reaching to, or extending a 

 little beyond, apex of anten- 

 nal scale. 



Second pair of pereiopods 

 reaching beyond apex of an- 

 tennal scale by the whole 

 length of the chela and 

 usually by a portion of the 

 carpus as well. 



Chelae of second pair 

 longer than carpus, with dac- 

 tylus little more than half the 

 length of the palm ; carpus 

 longer than merus. 



Eostrum practically straight, 

 without chromatophores. 



Eostrum armed dorsally 

 with three to five teeth^, 

 which do not extend into the 

 distal third ; the posterior 

 tooth situated on the cara- 

 pace a little behind the or- 

 bital notch^. 



Eostrum armed ventrally 

 with two teeth, less com- 

 monly with one. 



Shorter ramus of outer an- 

 tennule fused to the longer 

 for nearly three-quarters its 

 length. Both free rami and 

 from two-thirds to the whole 

 of the fused portion extend- 

 ing beyond the apex of ros- 

 trum. 



Antennal scale as wide dis- 

 tally as basally, its outer 

 margin practically straight. 



Mandible without palp. 



First pair of pereiopods 

 falling short of, or extending 

 a little beyond, apex of an- 

 tennal scale. 



Second pair of pereiopods 

 falling short of apex of an- 

 tennal scale, or reaching 

 beyond by as much as the 

 length of the chela. 



Chelae of second pair 

 shorter than carpus, with 

 dactylus rather less than 

 two-thirds the length of the 

 palm; carpus longer than 

 merus. 



1 Not counting the small distal tooth which is usually present, and 

 which forms the upper portion of the bifid apex. 



2 Rostrum very rarely armed with one, two, six, or seven teeth 

 dorsally. and wholly unarmed or with three teeth ventrally (v. Weldon 

 J892). 



