Boone, Crustacea, Cruises of "Eagle" and "Ara," 1921-28 161 

 Portunus (Portunus) vocans (A. Milne Edwards). 

 Plate 55, fig. A. 



Diagnostic chakacters : An acute spine at each end of the posterior 

 margin of the carapace. Dorsal surface of the carapace is roughened ; 

 four tubercles form an arc on the mesogastric region ; there is a trans- 

 verse, granulate carina extending across the carapace from tip to tip 

 of the lateral spines; other rugosities are present. Carpus of the 

 chelipeds with three denticulate ridges and an acute spine at each 

 the inner and outer angles ,- propodus well developed, five denticulate 

 ridges, the uppermost terminating in a distal spine; the median one 

 with a large basal spine. 



Type: Prof. Milne Edwards' type was taken at the Cape Verde 

 Islands by M. de Cessac and is deposited in the Paris Museum. 



Distribution : Very rare. Cape Verde Islands ; Carenge Bay, Haiti. 



Material examined: One ovigerous female dredged in Carenge 

 Bay, Le Mole, Haiti, February 4, 1924. 



Technical description: Carapace elongate oval, 18 mm. long, 33 

 mm. wide from tip to tip of lateral spine, interorbital space 7.5 mm. 

 wide; frontal teeth four, broadly rounded, well separated, the inner 

 pair more semicircular than the outer, the preorbital tooth small, sub- 

 acute, well separated from the others; the superior orbital margin 

 crenulate, with two linear sinuses ; the postorbital angle is acute and 

 immediately beneath it there is another small acute tooth ; below this 

 and beneath the second marginal tooth is a row of three oval tubercles. 

 The inferior orbital margin has two wide V-shaped sinuses, one below 

 the orbital tooth and one just inside the inferior inner orbital tooth, 

 which is prominent, rounded ; the opposite angle of this sinus forms a 

 blunt tooth. The anterolateral margin has eight teeth in addition to 

 the preorbital tooth ; seven of these are approximately equal, decreas- 

 ing very slightly in width and increasingly acuminate from the first 

 to seventh, with the tips directed forward ; the ninth or lateral tooth is 

 but a trifle longer than the eighth and is very acuminate, upward and 

 slightly forward directed. The postlateral margins are concave; the 

 posterior margin is relatively straight, lightly carinate, terminating 

 in an acute upcurved spine at each end. Four rounded tubercles form 

 an arc on the mesogastric region. There is a continuous tuberculate 

 carina extending across the carapace from tip to tip. The cervical 

 and urogastric grooves are very prominent. There is a flattish tubercle 



