CHAP. IV.] THE VOYAGE HOME. 191 



this is a kind of investigation wliicli requires time and stillness 

 and passable comfort ; and such are not the usual conditions of 

 a voyage in the Antarctic Sea. Specimens have been carefully 

 preserved with the young in all stages ; and I hope that a care- 

 ful examination of these may yield some further results. 



Cladodactyla crocea is one of the forms in which there is no 

 special marsupium formed ; it is possible that the comparative- 

 ly genial condition of the land-locked fiords and harbors of the 

 Malvinas, and the additional shelter yielded by the imbricating 

 fronds of Macrocystis, may render such exceptional provision 

 unnecessary. 



Five at least of these directly developing echinoderms, repre- 

 senting five principal divisions of the subkingdom, were dredged 

 at the Falklands, and several others were found earlier in the 

 voyage in the subantarctic regions of the Southern Sea. It will, 

 perhaps, give a better idea of the diversity of means by which 

 practically the same end is attained, if I give here a brief de- 

 scription of the principal modifications of the process which 

 were exhibited. 



To give a second example from the Ilolotliuroidea^ on the 

 morning of the 7th of February, 1875, we dredged at a depth 

 of 75 fathoms, at the entrance of Corinthian Harbor {alias 

 " Whisky Bay "), in Heard Island (so far as I am aware, the 

 most desolate spot on God's earth), a number of specimens of a 

 pretty little Psolus, which I shall here call, for the sake of con- 

 venience, P. ephippifer, although it may very possibly turn out 

 to be a variety of the northern P. operculatus. 



P. ephippifer (Figs. 39, 40) is a small species, about 40 mm. 

 in length by 15 to 18 mm. in extreme width. In accordance 

 with the chai:acters of the genus, the ambulatory area is abruptly 

 defined, and tentacular feet are absent on the upper surface of 

 the body, which is covered with a thick leathery membrane in 

 which calcareous scales of irregular form are imbedded. The 

 oral and excretory openings are on the upper surface, a little 



