PASIPHAEIA ACUTIFKONS. 175 



in proportion to the whole body than it is in the latter, and that the dorsal 

 crest is .smaller and somewhat differently shaped. Comparison of the figures 

 of the two species reveals, moreover, a difference in the outline of the antero- 

 lateral margin of the carapace. The fifth and sixth abdominal segments are 

 much shorter in proportion to the length of the telson in P. umericaua than 

 in P. crisMa. The antennular peduncle in the former is only one third 

 as long as tlie carapace, while in the latter it is about one half as long. 

 Finally, the flagellum of the antenna in the former is longer than the body, 

 while in the latter it is described as being only one half as long. 



Eggs, taken from beneath the abdomen of a female specimen, measure 

 2 mm. by 1.3 mm. 



Pasiphaeia princeps Smith. 



Pasiphae imnceps Smith, Aim. Rep. U. S. Fish Comm. for 18S2, p. 381, Plate V. Fig. 2, 1S84. 



Station 3376. 1132 fathoms. 1 specimen. 



The distal end of the basipodite of the first and second pairs of legs is 

 armed with a spine below. The merus of the first pair of legs is destitute of 

 spines, while the merus of the second pair is armed with six spines on the 

 inferior border. Length from tip of postfrontal spine to end of telson, 

 70 mm. 



The type specimen of Pasiphaeia princeps was obtained by the " Alba- 

 tross" off the east coast of the United States in 1883, lat. 39° 29' N., long. 

 70° 58' 40" W., 1342 fathoms. It is a very large specimen, measuring 

 215 mm. in length. Smaller specimens were secured in the same region 

 during the cruise of the " Albatross " in 1884, from depths varying i'rom 444 

 fathoms to 693 fathoms.* 



Tlie late J. Wood-Mason t established a new genus, Phyc, for Pasiphaeia 

 alcocki, P. princeps, P. acutifrons, etc., in which the carapace and abdomen are 

 more or less carinated dorsally, the telson forked, and branchiostegal spines 

 present. 



Pasiphaeia acutifrons Bate. ? 



? Pasiphaa acutifrons B.\TE, Rep. Clialleuger Macrurn, p. 871, Plate CXLI. Fig. 3, 1888. 



Station 3402. 421 fathoms. 2 specimens. 

 " 3403. 384 " 4 " 



3406. 551 " 4 



* S. I. Smith, in Ann, Rep. U. S. Fi.sh Comm. for 1885, p. 682, 1886. 



t 111. Zool. H. M. I. M. S. " Investigator," Crustacea, Plate III., 1892 ; Ann. Mag. Nat. Hist., Glh 

 Scr., XI. 164, 1893. 



