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PASIPHAEIA AMEEICANA. 



173 



! 



margin. Bate savs that in iV". 



the posteiior margin of the carapace, where it is confluent with the lower- 



most, subniargiual carina. 



iV. 



I have named this species for the artist of the expedition, Mr. A. M. 

 Westergren, whose drawing of the tjpe specimen, colored from the life, is 

 reproduced on Plate F. 



Family PASlPHAEITDyE. 



f 



I 



PASIPHAEIA Sav. 



Mcin. sur Ics Auimaux sans Vertcbrcs, I. 50, 1S16 IPasipkaal* 



Pasipliaeia americana Fax. 



PMe XL v., Fig. 1-1\ 



Pasvplmda crutata americana Pax., Bull. Mus. Comp. Zocil, 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 J infra-orbital angles rounded, projecting a little beyond 

 the median inter-orbital process ; at the level of the base of the second an- 

 tennas, the margin of the carai)ace 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 lino. 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 



* Pasipluea was cliaUKed to Pasiphae by llisso (Tlist. Nat. do FEurope Merid., V. 81, 182(5), and by 

 Kroyer (Naturhist. Tidsskr., 2 R., I. 453, 1845), and this cineudatiou has been accepted b.y G. 0. Sars and 

 S. I. Smith. It seems more probable that Pasipliaeia (/. e. Phicdra) was the M'ord intended by Savigny. 



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