138 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 



C^. Abdomen usually compressed, rarely noticeably flattened (as 

 in Pseudosquilla veleronis) ; telson with a well-marked, 

 usually sharp, median carina, and (in adults) usually with 

 one or more additional carinae either side ; submedian teeth 

 with movable tips or spines; no submedian denticles (at 

 least in adults). 



Di. Raptorial dactylus armed with teeth ; usually with 3 or 4, 

 counting the terminal one, sometimes with as many as 

 7 or 8 (P. veleronis). . . . Pseudosquilla^ p. 170 



D^. Raptorial dactylus unarmed except for terminal tooth. . 

 Hemisquillaj p. 181 



G^. Abdomen depressed, noticeably flattened ; telson without true 

 or definite median carina ; submedian denticles may or may 

 not be present, present in most species. 



D^. Raptorial dactylus as in preceding genera, not inflated at 

 base ; armed with 4 or more teeth, including the termi- 

 nal one; telson smooth or scabrous and without sub- 

 median spinules or denticles, or with a transverse row 

 or circlet of spines and submedian spinules or denticles 

 on its posterior margin. . . . LysiosquillUj p. 184 



D^. Raptorial dactylus inflated at base; armed with not more 

 than 4 teeth, including terminal one;^^ telson closely 

 studded with small spines or fine spinules, or large tu- 

 bercles; with or without a pair of submedian carinae. 

 Coronida, p. 202 



A2. Ischiomeral articulation of raptorial claw situated at a point ante- 

 rior to proximal end of merus, which consequently extends back- 

 ward considerably beyond the joint; ventral surface of merus 

 grooved and hollowed out for reception of propodus for not more 

 than % its length; raptorial dactylus inflated at base and un- 

 armed except for terminal tooth. . . . Gonodactylus, p. 208 



28 In the 17 mm. long, unique specimen of Coronida stnuosa Edmondson (Occ. 

 Paps. Bishop Mus., Vol. 7, No. 13, p. 295 [17], fig. 2, 1921), one raptorial dactylus 

 is armed with 4 teeth, including the terminal one, the other with 5. Its placement in 

 Coronida should at best be considered only tentative, for, as Dr. Edmondson him- 

 self comments, "There is no certainty that the individual described is mature." The 

 telson is not spined or tuberculated ; its dorsal surface is "marked by numerous 

 linear, curved, and scroll-like carinae which lack symmetry on the two sides except 

 in the medial region, where it is maintained in a slight degree." 



