CRUSTACEANS. 57 



fourteen joints. The joints are covered with numerous fine pores; but 

 commonly one much larger pore on each side, below the middle, is very 

 conspicuous in the middle joints of the antennae, principally in the six- 

 teenth and preceding joints. Such a large pore contains the insertion 

 of a sensitive hair. 



No other order of insect proper seems to be represented on Kerguelen 

 Island than those already mentioned. Neither was any member of the 

 class Myrlapoda observed. Spiders of the wandering sort are abun- 

 dant, their tents being numerous under almost every large stone. There 

 are no web-builders, however, and, although individuals are numerous, 

 the variety in form is slight. The collection has been sent to Mr. Will- 

 iam Holden, of Marietta, Ohio, for identification. 



A small red acarinus was very plentiful upon the leafstalks of the 

 Kerguelen cabbage, and, indeed, wherever succulent vegetation was lux- 

 uriant. Broad yellow bands, observed on the sides of rocks frequented 

 by cormorants, were found to consist almost entirely of another variety 

 of acarinus, yellow in color, and spotted on the back, somewhat like the 

 " lady-bird" (Coccirte/7a). 



CRUSTACEANS. 



Described by S. I. Smith. 



DECAPODA. 



PINNOTHERIDJ^]. 



Halicarcinus planatus, White. 



Cancer planatus, J. C. Fabricius, Entomologia Systematica, ii, 446, 1793. 



Lcucosia vlanata, J. C. Fabricins, Siipplemeatum Entomologias Systematicas, 350, 1798. 



Hymenosoma iridentatmn, Lucas, in Horabron et Jacquinot, Voyage de 1' Astrolabe au 

 pole sud, 60, pi. 5, figs. 27-33. 



Halicarcinua planatus, White, Annals and Magazine Nat. Hist., vol. xvii, 178, 1846, 

 pi. 2, fig. 1 ; Catalogue Crust. British Museum, 33, 1847. — Dana, United States 

 Exploring Expedition, Crust., 385, pi. 24, fig. 7, 1852. — Edwards, Annales des 

 Sciences naturelles, 3me s6rie, xx, 1853, 223. — Heller, Reise der osterreichischeu 

 Fregatte Novara um die Erde, Crust., 66, 1865. 



Specimens of this species were collected at Kerguelen Island, on 

 rocky beaches, and others were dredged in five fathoms. It was previ- 

 ously known from Tierra del Fuego and New Zealand. The males are 

 nearly equal in size to the females, and have very much stouter cheli- 

 peds. 



