SICYONIA AFFINIS. 179 



Family PENEID^. 



SICYONIA :m. Edw. 

 Anu. Sci. Kilt., XIX. 339, 1S30. 



Sicyonia afllnis Fax. 

 PMe XLVL, Fkj. 1-T. 



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



This species is the Pacific coast representative of Sicyonia edivardsii* of 

 the Atlantic coast of Araerica. It agrees with S. edivardsii in the form and 

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

 inal segments. In S. edivardsii 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, the pleurse of these segments are angulated below. In 

 S. affinis these segments are smooth, the impressed lines are absent with the 

 exception of the hinder one of the deeply cut pair, and the pleuras are 

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

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

 but little longer than the carapace. 



Length, G2 mm. ; carapace, 20 mm. 



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

 " 3369. 52 " 1 " 



" 3378. 112 " 2 fern. 



3379. 52 " 1 " 



The color in life, as shown in a sketch made by Mr. Westergren, is light 

 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. edivardsii as given 

 by Dana.t 



* Sicyonia edwardsii Miers, Ann. Mag. Nat. Hist., 5lh Ser., VIII. 367, 1881 ; Siri/onia carimta (OVmcv) 

 Milne Edwards, Ann. Sci. Nat., XIX. 344-346, Plate IX. Fig. 9, 1830; uec Siri/oiiia carinata (Olivi). 

 t U. S. Explor. Exped., Crustacea, Pt. I., p. 602, 1852. 



