Boone, Crustacea, Cruises of ''Eagle" and "Ara," 1921-28 107 



of the abdomen. There is a decided patch of seaweed-brown in the 

 median dorsal region of the carapace just behind the rostrum. The 

 eyes are deep brown. 



Technical description : Animal large, four to six inches long, 

 being an average size. Carapace robust with the rostral carina 

 prominent, continued posteriorly not quite to the hinder margin of 

 the carapace. Rostrum strong, thick, short, reaching only as far for- 

 ward as the scaphocerite, directed straight forward, armed on the 

 inferior margin with two teeth and on the superior margin with 

 about eight teeth, and one postrostral tooth. Adjacent to the rostrum 



Text fig. 2. — Peneus hrevirostris Kingsley. A, B. Petasma X 3. 



on either side there is a carina extending from about midway the 

 length of the carapace forward onto the upper surface of the rostrum. 

 There is a short antennal spine, also a small hepatic spine. There is 

 a deep sulcus running forward from the hepatic spine to the base of 

 the eye-stalk, and margined above by a short carina which begins 

 near the base of the hepatic spine but does not extend quite to the 

 frontal margin, and on the lower by a more prominent carina which 

 runs obliquely backward from the antennal spine ; a short, oblique 

 carina lies below the hinder end of this larger carina. 



The abdomen is stout, laterally compressed, a distinct median 

 longitudinal carina on the fifth and sixth segments, terminating on 

 the sixth segment in a slight spine. The first abdominal segment has 

 the anterior half of the epimeral margin produced to a prominent 

 triangle, the posterior portion convex; the epimera of the second, 

 third and fourth segments are rounded, that of the fifth segment 

 produced to a triangle at the postlateral angle ; the sixth segment is 

 about one and one-half times as long as the fifth ; the telson is about 



