178 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 



width perhaps % the length (as drawn, fig. Ma, the posterior portion 

 of the carapace has been spread out so that the greatest width of the 

 posterior portion appears relatively greater than it actually is) ; antero- 

 lateral angles rounded; rostral plate triangular to subcordiform, wider 

 than long, apically subacute and showing a slight keeling near the tip. 

 The eyestalks appear more or less cylindrical because of great obliquity 

 of cornea, which sits on the stalk at an angle of 45° or more. 



Raptorial dactylus armed with from 7-8 teeth, including the terminal 

 one; near the base of the external margin there is a well-marked, rounded 

 tooth or lobe. 



Posterolateral angles of 5th thoracic somite inconspicuous, more or 

 less flattened and distally rounded; below there is a flattened, down- 

 wardly projecting lobe, or blunt process, either side which is situated 

 below and more or less between the anterolateral and posterolateral 

 angles of the somite, but not visible in dorsal view; lateral margins of 

 6th and 7th somites rounded. 



Posterolateral angles of 5th and 6th abdominal somites produced 

 into spines; posterior margin of 6th somite armed with a pair of sub- 

 median spines, but there are no evident submedian carinae; intermediate 

 carinae low and rounded, each ending posteriorly in a sharp spine ; above 

 the lateral margin there is a low longitudinal swelling suggestive of a 

 lateral carina — at any rate it converges with the lateral margin to end 

 in the spined posterolateral angle of the somite. 



The telson carries a strong, well-marked median carina with rounded 

 crest ending in a short spine; either side and parallel to the median carina 

 is a longitudinal row of low blunt teeth ; above and a little distance back 

 from (anterior to) the inner base of each intermediate tooth of the hind 

 margin of the telson a bluntly crested carina runs forward, converging a 

 little toward the proximal end of the median carina ; posteriorly, each of 

 these carinae ends in a small, low, rounded tubercle ; inside each of these 

 carinae and about in line with their posterior ends is a second little 

 rounded tubercle, anterior to which there may be another smaller and 

 more pointed, though still blunt, one. In a slight outwardly bowed line 

 running from the intermediate spine of the 6th abdominal somite to the 

 intermediate tooth of the hinder margin of the telson is a fairly sharply 

 ridged, but, at irregular intervals, nodulated or blunt-toothed carina, the 

 hinder portion of which may be discontinuous; this posterior portion ends 

 behind in a blunt tooth ; between the anterior end of each of these carinae 

 proper and nearer the anterior margin of the telson than the end of the 



