Boone, Crustacea, Cruises of "Eagle" and ''Ara," 1921-28 125 



to 388 fms. ; one specimen from ''Blake" station 328 in 1632 fms. ; de- 

 pository not stated. 



Distribution : The reliably identified material of this species shows 

 its distribution to be restricted to the Atlantic Ocean and Mediter- 

 ranean Sea. 



Material examined : One specimen dredged in 400 fms., bottom 

 depth 500 fms., off St. Kaphael, bearing S. S. E., distance 9 miles, 

 south of France, Mediterranean Sea, by the "Ara." 



Color: Clear lacquer red, much darker and with decided bluish 

 reflections on the carapace. Flecks of deeper crimson the scaphocerite 

 and basal portion of caudal fan. Setae golden, eyes jet black. 



Discussion : This is one of the largest and most gorgeously colored 

 members of the genus found in the Atlantic. The largest specimen 

 recorded to date has a length measurement of 90 mm. The type de- 

 scription by Smith, and Kemp 's later notes on the extensive series of 

 specimens taken off the Irish coast, give very adequate diagnoses of 

 the species. The single specimen taken by the "Ara" agrees with the 

 material figured by these authors. 



Synonymy. — Sergestes rolustus S. I. Smith, Bull. Mus. Comp. Zool., 

 vol. 10, p. 97, pi. 16, figs. 5-8, 1882 ; Kept. U. S. Fish. Comm. for 

 1882, issued 1884, p. 416, pi. 8, figs. 3-6; Ihid. for 1885, issued 

 1886, p. 697, pi. 20, fig. 6.— Hansen, Ann. Mag. Nat. Hist., Ser. 7, 

 vol. 11, p. 480, 1903 ; Crust. Malacostraca Danish Ingolf Exped., 

 p. 83, 1908; Sergestidae, Monaco, Fasc. 64, p. 106, pi. 1, fig. 5, 

 pi. 6, figs. 2t-2z, 1922.— Kemp, Fish. Ireland, Sci. Invest, vol. I, 

 p. 25, pi. 3. See figs. 1-12, 1908. 

 Sergia rolusta Ortmann, Decap. und Shizopoda der Plankton Exped., 



p. 38, 1893. 

 Sergestes inermis Hansen, ibid., 1903, p. 479, figs. 1 and 5. 



Sergestes vigilax Stimpson. 



Plate 42. 



Type : Stimpson 's type was a very large mastigopus stage specimen 

 from the Azores. 



Material examined : Two specimens, dredged 38 miles E. l^ S. E. 

 of Cape Spartivento, Sardinia, in 325 fms., July 22, 1927, by the 

 "Ara." 



Color: This species is creamy white, except on the upper part of 

 the carapace which is translucent rose color. The delicacy of shading 

 is indescribably exquisite. 



