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BULLETIN' 15 8, UNITED STATES NATIONAL. MUSEUM 



CORYCAEUS SPECIOSUS Dana 



Figure 216 



Corycaeus speciosus Dana, Proc. Amer. Acad. Arts and Sci., vol. 2, p. 38, 1849. — 

 GiBSBEEOHT, Fauua und Flora des Golfes von Neapel, vol. 19, p. 660, pi. 1892. 



Occwrreiice. — Both sexes taken in the trawl wings at Station 2195, 

 Albatross^ south of Nantucket ; one female in a surface tow, Station 

 2171, Albatross; two females in surface tow on Georges Bank, Sep- 

 tember, 1874. 



Distribution. — Tropical Atlantic (Dana, Brady) ; Canary Isles, 

 Malta (Thompson) ; tropical Atlantic and Pacific (Giesbrecht) ; 

 Eed Sea, Indian Ocean, Arabian Sea (Thompson and Scott) ; North 



Atlantic (Cleve) ; Mediterranean 

 (Giesbrecht) ; South Africa (Steb- 

 bing) ; Chesapeake Bay (Wilson). 



Color. — Body rather opaque, with 

 pigment spots of red, yellowish 

 red, and yellow scattered through 

 it irregularly; eye red; eggs yel- 

 lowish. 



Female. — Head fused with first 

 segment; third and fourth seg- 

 ments also fused; lappets on third 

 segment reaching beyond the pos- 

 terior margin of the genital segment 

 and spreading somewhat; those of 

 the fourth segment small and blunt. 

 Genital segment spindle-shaped, 

 considerably dilated through the 

 center ; caudal rami longer than the 

 genital segment and abdomen com- 

 bined, and divergent; endopod of fourth leg a short knob with one 

 seta. Total length, 1.85-2.15 mm. 



Male. — Body narrower than in the female; lappets of third seg- 

 ment not spreading and not reaching the center of the genital 

 segment; lappets of fourth segment reduced to minute spines; gen- 

 ital segment with a notch, carrying a seta on each lateral margin 

 near the posterior end; caudal rami as long as the genital segment 

 and abdomen combined. Total length, 0.75-0.85 mm. 



Remarks. — This is also a tropical species, but it has been reported 

 by Cleve in the Atlantic as far north as latitude 50° N. The length 

 of the caudal rami and that of the lappets on the third segment are 

 distinguishing characters. 



FiGUEB 216. — Corycaeus speciosus: 

 Female, dorsal (after Giesbrecht) ; 

 male, dorsal 



