PASIPHAEIA AMERICANA. 173 
margin. Bate says that in JV. patentissimus the antennal carina terminates in 
the posterior margin of the carapace, where it is confluent with the lower- 
most, submarginal carina. This is not the case in NV. westergreni. 
I have named this species for the artist of the expedition, Mr. A. M. 
Westergren, whose drawing of the type specimen, colored from the life, is 
reproduced on Plate F. 
Famity PASIPHAEIID AS. 
PASIPHAETIA Sav. 
Mém. sur les Animaux sans Vertebres, I. 50, 1816 [ Pasiphea].* 
Pasiphaeia americana Fax. 
Plate XLV., Fig. 1-L°. 
Pasiphaeia cristata americana Fax., Bull. Mus. Comp. Zodl., XXIV. 208, 1893. 
Body strongly compressed laterally. Carapace from three tenths to one 
third as long as the whole body; dorsum extremely compressed but rounded, 
rising into a thin, triangular, sharp-pointed crest in the median line a little 
way back of the anterior margin ; anterior margin slightly advanced in the 
form of a rounded lobe between the bases of the eye-stalks, but not produced 
to a distinct rostrum; infra-orbital angles rounded, projecting a little beyond 
the median inter-orbital process ; at the level of the base of the second an- 
tenn, the margin of the carapace trends backward nearly horizontally, and 
then turns downward at a right angle (rounded), and also slightly inward, 
forming an efferent channel from the branchial chamber behind and beneath 
the basal segment of the second antenna; on the upper margin of the efferent 
branchial opening there is a slender, acute, procurved spine; a low distinct 
longitudinal ridge runs along the superior half of the branchial area. 
The abdominal segments are rounded dorsally, not carinate, although the 
sixth is strongly pinched in on each side of the median dorsal line. The 
sixth segment is one third longer than the telson, which is equal in length to 
the fifth segment; the posterior margin of the telson is notched in the middle 
and armed on each side with about eight spines, the outer one the longest, 
the others diminishing in importance from without inwards. 
The antennules are furnished with a stylocerite on the external side of 
* Pasiphea was changed to Pasiphae by Risso (Hist. Nat. de P Europe Mérid., V. 81, 1826), and by 
Kroyer (Naturhist. Tidsskr., 2 R., I. 453, 1845), and this emendation has been accepted by G. O. Sars and 
S. I. Smith. It seems more probable that Pasiphaeia (i.e. Phedra) was the word intended by Savigny. 
