P. spectrum, Dohrn: Plymouth (A. H. Norman).

Besides the above, all of which are littoral or more or less shallow-water species, we have another series of forms, or, to speak more correctly, we have two other series of forms, from the deep Atlantic waters within the British area. In the cold area of the Faeroe Channel we have Boreonymphon robustum, Bell; Nymphon elegans, Hansen; N. sluiteri, Hoek; N. stenocheir, Norman; Colossendeis proboscidea, Sabine; C. angusta, Sars. In the warm waters south and west of the Wyville-Thomson ridge we have Chaetonymphon spinosissimum, Norman; Nymphon gracilipes, Heller (non Fabr.); N. hirtipes, Bell; N. longitarse, Kr.; N. macrum, Wilson; Pallenopsis tritonis, Hoek (= P. holti, Carpenter); Anoplodactylus oculatus, Carpenter, and A. typhlops, G. O. Sars; and to the list under this section Canon Norman has lately made the very interesting addition of Paranymphon spinosum, Caullery, from the Porcupine Station XVII., S.S.E. of Rockall, in 1230 fathoms. Lastly, and less clearly related to temperature, we have Chaetonymphon tenellum, Sars; N. gracilipes, Fabr.; N. leptocheles, Sars; N. macronyx, Sars; N. serratum, Sars; and Cordylochele malleolata, Sars.

Of the species recorded in the above list as a whole, Anoplodactylus virescens, Nymphon gracile, and Pallene spectrum reach their northern limit in the southern parts of our own area; Ammothea echinata, Anoplodactylus petiolatus, Pallene brevirostris, and Phoxichilus spinosus (or very closely related forms) range from the Mediterranean to Norway, the last three also to the other side of the Atlantic; Nymphon brevirostre and N. rubrum range from Britain, where they are in the main East Coast species, to Norway. Of the Atlantic species, other than the Arctic ones, the majority are known to extend to the New England coast.

INDEX

Every reference is to the page: words in italics are names of genera or species; figures in italics indicate that the reference relates to systematic position; figures in thick type refer to an illustration; f. = and in following page or pages; n. = note.

END OF VOL. IV

Printed by R. & R. Clark, Limited, Edinburgh.

[1]. The muscles are to a certain extent segmented in correspondence with the limbs; and the heart, in Phyllopoda and Stomatopoda, may have segmentally arranged ostia.