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SICYONIA AFFINIS 



179 



Family PENEID^. 



SICYONIA M. Edw. 



Ami. Sci. Nat., XIX. 339, 1S30. 



Sicyonia afianis Fax. 



Plate XL VI., Fig. l-T. 



Bull. Mus. Comp. Zool, XXIV. 209, 1893. 



This species is the Pacific coast rcprcseuiative of Sicyonia cdwardsii^ oi 

 the Atlantic coast of America, It agrees with S, edwarddi in the form and 

 dentition of the carapace, but differs in the form and sculpture of the abdom- 

 inal segments. In S, edwardsii the first four abdominal segments are rugose, 

 and ornamented on the sides with two deeply impressed transverse lines, 

 followed by another less deeply incised, near the hind margin of each seg- 

 ment; moreover, tlie pleuroa of these segments are angulated below. In 

 8, afmis these segments are smooth, the impressed lines are absent with tlie 

 exception of the liinder one of the deeply cut pair, and the pleurae are 

 broadly rounded below ; the peduncle of the second antenna is not much 

 over one half the length of the antenna! scale, and the whole antenna is 

 but little longer than the carapace. 



Length, 62 mm.; carapace, 20 mm. 



Station 3367. 100 fatlioms. 1 male, 1 fern. 



££ 



ii 



iC 



33G9. 



52 



3378. 112 

 .3379. 52 



66 



66 



66 



S6 



1 



2 fern. 



1 



66 



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greenish yellow, banded with vermilion on the branchial regions and ab- 

 domen. Appendages red, antennal flagellum transversely banded with light 

 and dark. The coloration is quite different from that of S. edwardsii as g-iven 



by Dana.f 



* Bicyonia edwardsii Mlcrs, Ann. Mag. Nat. Hist., 5tli Scr., VIII. 3G7, 1881 ; Sicyonia cm;?.^/^/ (Olivier) 

 Milne Edwards, Aim. Sci. Nat., XTX. 344-346, Plate IX. Eig. 9, 1830; uec Sieyonia carimta (Olivi). 



t U. S. Explor. Expcd*, Crustacea, Pt. L, p. G02, 1852. 



*f^ 



