. Report on the scientific results of the voyage of H. M. S. Challenger during the years 1873-76 under the command of Captain George S. and the late Captain Frank Tourle Thomson, R. N. uch import-er, brain; m, lateral nerve; i, intestine; Pt 1, rliyn- , . , i • j. j> ^•chodienm; Pt% papilliferous ; IH, glandular part of aUCC tO tlllS pomt, aS the ODJCCt OI tlieSC linCSthe proboscis; PI 3 and ca, region of the stylet and i • a • tit reservoir. IS only to show that in America also land Nemerteans exist. Hitherto they were only known from the Pelew Islands, whereSemper has found a
. Report on the scientific results of the voyage of H. M. S. Challenger during the years 1873-76 under the command of Captain George S. and the late Captain Frank Tourle Thomson, R. N. uch import-er, brain; m, lateral nerve; i, intestine; Pt 1, rliyn- , . , i • j. j> ^•chodienm; Pt% papilliferous ; IH, glandular part of aUCC tO tlllS pomt, aS the ODJCCt OI tlieSC linCSthe proboscis; PI 3 and ca, region of the stylet and i • a • tit reservoir. IS only to show that in America also land Nemerteans exist. Hitherto they were only known from the Pelew Islands, whereSemper has found another, to which he has given the name of Geonemertes think it is highly probable that land Nemerteans exist to a greater extent in tropicalcountries than has hitherto been supposed, and that from their hidden life, and theimpossibility of preserving them, they have hitherto escaped the attention of travellingnaturalists. Especially in such Islands as the Bermudas, where the earth of the lowergrounds contains a great deal of salt, it may easily be imagined how marine animals havetaken to terrestrial habits; and it was interesting for me to see that one Tetrastemma. These figures referred to by Sul:ni have not been here reproduced. REPORT ON THE NEMERTEA. 25 when put into salt water would live there for twenty-four hours, but when put into freshwater died after a few hours time. Fresh water, however, poured over the earth whichcontained them, did not damage them in the least. Tetrastemma fuscum, Willemoes Suhra {nee (Ersted). A second species of Tetrastemma was noticed by Suhm during the first year of theChallenger cruise. In the paper just referred to, in which he describes Tetrastemmaagricola, it is noticed in the following words:— I may here also add that on our cruise from the Bermudas to the Azores I foundparasitical Nemerteans on Nautilograpsus minutus, one of the gulf-weed crabs. Theywere small brownish animals, and occupied especially the underside
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