Boone, Crustacea, Cruises of "Ara" and "Alva" 213 



off Santa Cruz and off Barbados, by the "Blake," at "Fish Hawk" 

 station 6076, Mayaguez Harbor, Porto Rico, and off Cape Frio, 

 Brazil, depth 35 fathoms, by the U. S. steamer "Hassler." The 

 "Alva" station, 13 miles off Sombrero Light, Florida, depth 80 

 fathoms, establishes the most northern record for this species. 



Material examined: Eight specimens, seven males and a 

 female, dredged at Sombrero Light, Florida, bearing 54° true, 

 distant 13 miles, in 80 fathoms, January 23, 1933, by the "Alva." 



Technical description : The single haul made by the "Alva" 

 off Sombrero Light, Florida, fortunately resulted in a catch, con- 

 sisting of more and larger specimens than are known from the 

 total number taken by all previous expeditions. The present series 

 of specimens (preserved) are a rich old ivory. 



These specimens give the following measurements, all ex- 

 pressed in millimeters : 



The carapace is pyriform, the rostrum being a single sharp 

 spine compressed laterally, the dorsal margin laminate, deflected 

 distally and acuminate. There is a median postrostral depres- 

 sion between the orbits. The supraorbital spine is distinct ; the 

 postorbital angle forms a much stronger, triangulate tooth. All 

 of the regions of the carapace are sharply defined, the cervical, 

 urogastric and cardiac depressions being especially deep. The 

 lobes are all quite convex and ornamented with numerous spines, 

 which in this species, as in the majority of bathypelagic brachy- 

 ura, show considerable individual variation. In the median line 

 there are two large gastric spines, with a variously obsolete or 

 weak third spine between these, the posterior gastric spine nor- 

 mally being much the strongest of the gastric series ; on the apex 

 of the cardiac region there is a second strong tooth, posterior to 

 this a weaker spine, followed by another spine on the intestinal 



