Boone, Crustacea, Cruises of ''Eagle" and "Ara,'' 1921-28 187 



Greenland; shore line to 120 fms. ; described by several authors as 

 being very rare. 



Material ex^vmined: Seven specimens, one of which is ovigerous, 

 taken in 7 fms., upper end of Whitehaven Harbor, Nova Scotia, Sept. 

 6, 1926. 



Three specimens taken in Beaver Harbor, Nova Scotia, September 10, 

 1926, by the "Ara." 



Technical description: Carapace short, laterally compressed, 

 widening posteriorly, narrowed anteriorly, the eyes and the frontal 

 region between the antennal spines is produced and directed upward. 

 The rostrum is represented by a short, acute tooth, which is carinated 

 in the median line ; the frontal margin on either side of this rostrum 

 is concave; the angle above the orbital fissure is nearly right-angled; 

 the fissure is straight, closed; the lower orbital angle is produced in 

 advance of the upper, has an acute apex, with the lower lateral margin 

 convex and densely ciliate; the outer frontal margin is moderately 

 concave, and the pterygostomian angle is armed with a single acute 

 spine ; the lateral margin is bent under the body and is slightly con- 

 vex posteriorly. There is an interrupted carina in the median dorsal 

 line, consisting of three acute, forward-directed spines, the first of 

 which serves as the rostral spine ; the second spine has its apex at the 

 mesogastric region; the third spine, which is subequal to the second, 

 has its apex at the anterior cardiac region; each spine runs back a 

 distance as a carina, the hinder one extending to the posterior margin ; 

 the hepatic spine is well-developed, acuminate, almost in line with the 

 second spine of the dorsal line. The dorsal surface of the carapace is 

 finely granulose. 



The first abdominal segment is 4 mm. long, with the anterolateral 

 angle rounded ; the postlateral angle less so, nearly right-angled, over- 

 lapped slightly by the pleura of the second segment, which is of equal 

 length in the median line, with the pleura convex anteriorly and pos- 

 teriorly, overlapping the adjacent segments, much less convex on the 

 distal margin ; the third segment is slightly longer, being 4.6 mm. long, 

 with the posterior margin very slightly concave; the pleural margin 

 nearly straight, the hinder angle being slightly rounded; the fourth 

 segment is 4.5 mm. long, with the median posterior region produced 

 and slightly convex, the hinder margin curving into the deep notch 

 in the median lateral line, beyond which the pleural margin curves 

 outward, forming a slightly convex lobe, the lateral margin is rela- 

 tively straight. The fifth abdominal segment is 5 mm. long, including 



