SICYONIA AFFINIS. 179 
Famity PENEID. 
SICYONIA M. Epw. 
Ann. Sci. Nat., XIX. 339, 1830. 
Sicyonia affinis Fax. 
Plate XIVI., Fig. 1-1’. 
Bull. Mus. Comp. Zoél., XXIV. 209, 1893. 
This species is the Pacific coast representative of Sicyonia edwardsii* of 
the Atlantic coast of America. It agrees with S. edwardsii 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, the pleure of these segments are angulated below. In 
S. affins these segments are smooth, the impressed lines are absent with the 
exception of the hinder one of the deeply cut pair, and the pleure 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, 62 mm.; carapace, 20 mm. 
Station 3367. 100 fathoms. 1 male, 1 fem. 
oe OOO es Oa) oo lea 
Grifter a ae ss 2 fem. 
oF solos 02 Tek 
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. edwardsii as given 
by Dana.t 
* Sicyonia edwardsii Miers, Ann. Mag. Nat. Hist., 5th Ser., VIII. 367, 1881; Stcyonia carinata (Olivier) 
Milne Edwards, Ann. Sci. Nat., XIX. 344-346, Plate IX. Fig. 9, 1830; nee Steyonta carinata (Olivi). 
+ U.S. Explor. Exped., Crustacea, Pt. I., p. 602, 1852. 
