. British Antarctic expedition, 1907-9, under the command of Shackleton : reports on the scientific investigations ; geology. profundus. The most interesting of the larger species occur in Slides 123 and 112 of twoforms which are certainly Protopharetrce, the former being akin to P. radiata, whilethe latter is a new species with a peculiar netted inner wall, like that characteristicof A. retezona, which is a species of another genus. I have given this the pro-visional title of P. retezona. Two highly irregular specimens may belong to the doubtful species P. are irregular mass
. British Antarctic expedition, 1907-9, under the command of Shackleton : reports on the scientific investigations ; geology. profundus. The most interesting of the larger species occur in Slides 123 and 112 of twoforms which are certainly Protopharetrce, the former being akin to P. radiata, whilethe latter is a new species with a peculiar netted inner wall, like that characteristicof A. retezona, which is a species of another genus. I have given this the pro-visional title of P. retezona. Two highly irregular specimens may belong to the doubtful species P. are irregular masses of calcareous laminae, and not improbably are merelyrooting attachments. A very curious organism, showing only in one section as an annulus formed of ashigle row of oval cells, with mdefinite rays and concentric walls within, is describedbriefly, but no attempt is made to name it. It is very doubtful if it belongs to theArchceocyathince. As in the South Australian specimens, large isolated spicules—not derived fromthe Archceocyathince—occur. One perfect tuning-fork is preserved, and hasbeen photographed. PLATE LXXYI. lM(i. I Inner- W^ll
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