140 Bulletin, Vanderhilt Marine Museum, Vol. II 



The ambulatories are long, well-developed, slightly granulose, setose 

 along the lateral margins, the daetyli long, slender, with a horny tip. 

 Synonymy. — Pilumnus irasiliensis Miers, Kept. Voy. "Challenger" 



Zool., vol. 17, p. 15, pi. 13, fig. 2, 1886.— Rathbun, Bull. U. S. 



Nat. Mus., vol. 20, pt. 2, p. 40, 1901. 



Pilumnus spinifer H. Milne Edwards. 

 Plate 44, fig. B. 



Diagnostic characters : Carapace nearly as long as wide ; frontal 

 margin wide ; anterolateral margin armed with five sharp spines, both 

 orbital margins spinose. Chelipeds unequal in both sexes ; the carpus 

 entirely and the upper three-fourths of the outer face of the palm set 

 with long, sharp spines, approximately set in rows and those on the 

 upper margin much longer than those lower down. Smaller cheliped 

 with entire outer face of palm bristling with sharp spines and setae ; 

 fingers strongly grooved. 



Type: Collected in the Mediterranean and deposited in the Paris 

 Museum. 



Distribution : Mediterranean Sea but not the Adriatic ; also found 

 on the coasts of North Africa. 



Material examined : One specimen dredged in 100 fms., 9^/2 uiiles 

 E. by S., 1/2 S. from Cape Bon Tunis, North Africa, January 19, 1927, 

 by the ''Ara." 



Technical description : Carapace 10 mm. long, 12.6 mm. maximum 

 width ; frontal margin 5 mm. wide ; incised in the median line, spinu- 

 lose along the margin. Inferior and superior orbital margins set with 

 sharp spines; subhepatic region also with the small spines below the 

 anterolateral spines. Anterolateral spines five, all very long and 

 acuminate, the third and fourth spines being slightly longer than the 

 second and fifth spines. Carapace decidedly convex, especially on the 

 anterior half; delineation of the regions obscure; upper surface 

 thickly set with long, apparently hollow, stiff, red-brown setae, as are 

 also the chelipeds and ambulatories. The female abdominal belt is 

 seven-segmented, widely oval, heavily fringed with setae along the 

 lateral margin. 



The eyestalk is stocky, calcareous ; the cornea terminal, large spher- 

 ical. 



The antennulae and antennae afford no specific characters. 

 The chelipeds are markedly unequal in both sexes ; the merus short, 

 trigonal, the upper and lower lateral margins spinose ; the carpus is 



