72 STALK-EYED CRUSTACEA. 
deeply furrowed along the median line, the chelipeds and ambulatory legs 
are knobbed so as to present “a mass of tubercles above.” P. panamensis 
appears to be near P. barbatus A. M. Edw. from the Azores, but in the latter 
species the front is broader and the carpus more denticulated. 
Famity GALATEIDA. 
PLEURONCODES Srrmeps. 
Aun. Lye. Nat. Hist. N. Y., VII. 245, 1860. 
Pleuroncodes monodon (M. Epw.) ? 
Plate XV., Fig. 3-3. 
? Galathea monodon M. Epw., Hist. Nat. Crust., II. 276, 1837. 
? Pleuroncodes monodon Stimes., Ann. Lye. Nat. Hist. N. Y., VII. 245, 1860. 
Pleuroncodes monodon ? Fax., Bull. Mus. Comp. Zool., XXIV. 176, 1893. 
Station 3385. 286 fathoms. 16 males, 7 fem. (“ halfa bushel rejected”). 
CeO SO0. pat oem OF 5 ie 
SOUON 200 J. te Diao a a8 
NT ots ale Gus’ genelllaeeees 
Compared with Milne Edwards’s figure* of P. monodon, the ‘ Albatross ” 
specimens, especially the males, present a more obese appearance ; their 
greatest width is across the cardiac region, while in the figure of P. monodon 
(which undoubtedly represents a female) it is near the posterior end of the 
carapace ; the cardiac area, in the examples before me, is sunk below the 
level of the rest of the carapace, and the transverse piliferous lines are more 
broken at this point, as well as on the gastric region, than appears to be the 
case in P. monodon, to judge from the figure referred to. Unless these dis- 
crepancies are due to the inaccuracy of Milne Edwards’s draughtsman, the 
“‘ Albatross” specimens belong to a new species. The type specimens of 
P. monodon came from the coast of Chile. 
In P. planipes Stimps. the penultimate segments of the ambulatory 
appendages are flattened and ciliated, and the cardiac area is not depressed 
as in the “ Albatross” specimens. PP. planipes appears to be a pelagic form. 
It has been taken off the coast of California and western Mexico. 
The lateral expansion of the carapace of P. monodon carries the antero- 
lateral angle some distance outward beyond the antero-lateral spine. This 
* Ann, Sci. Nat., Zool., 3¢™e Sér., XVI., Plate XI. Fig. 6-9, 1851. 
