10 ALLAN HANCOCK ATLANTIC EXPEDITION REPORT 



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anterior to cervical groove, located lateral to each gastric groove; 

 median tubercle present on posterior margin; lateral lobes of cara^ 

 pace swollen, convex, with swelling diminishing posteriorly; antero- 

 lateral angles rounded, anterior margin concave; posterolateral angles 

 broadly rounded, posterior margin strongly concave; anterolateral 

 width about one-half median length, posterolateral width over three- 

 fourths median length. 



Epipods present on first five thoracic appendages. Mandibular palp 

 present, three-segmented. 



Dactylus of raptorial claw armed with three short teeth, outer, prox- 

 imal margin faintly angled; propodus widening distally, with three 

 movable teeth on inner, proximal margin, and a row of pectinations 

 on outer margin; dorsal ridge of carpus with two subacute processes, i|| 

 neither spined ; raptorial claw, when folded, extending posteriorly to 

 cervical groove. 



Exposed thoracic somites with traces of a median carina on the 

 eighth and reduced submedian carinae on the sixth to eighth; inter- 

 mediate carinae prominent, not spined; lateral processes of fifth so- 

 mite blunt, inconspicuous; lateral process of sixth thoracic somite 

 rounded anteriorly, sub-truncate posteriorly; that of the seventh 

 rounded laterally and posteriorly; inner branches of walking legs two- 

 segmented. 



Abdomen noticeably depressed, with nine carinae on each of the 

 first five somites, six on the last; the following abdominal carinae end 

 in spines; submedian, 6; intermediate, 5; lateral, 6; marginal, (3) 

 4-5. Median carina of second to fifth somites notched ; submedian cari- 

 nae sinuous, not prominent, if notched, only on second somite; inter- 

 mediate carinae prominent, notched anteriorly on second to fifth somite 

 and reduced on sixth; lateral carinae short, reduced, interrupted an- 

 teriorly, extending dorsoventrally rather than parallel to body line; an 

 immovable spine present ventrally on sixth somite in front of articu- 

 lation of uropod. 



Telson slightly wider than long, greatest width posterior to base; 

 sharp dorsal crest present, obscurely notched anteriorly, terminating in 

 a sharp spine; a row of pits either side of crest terminating under ter- 

 minal spine; lateral carinae and two short submedian carinae present; 

 posterior margin with six sharp spines, submedian pair with movable 

 tips; 4-9 (usually 9) minute, movable, submedian denticles, and two 

 intermediate and one lateral denticle. 



