Zoology of the North Atlantic Expedition

Abstract

THESE two volumes comprise Nos. VI. and VII. of the results of the Norwegian North Atlantic Expedition. The first, which deals with the Holothurians, contains an interesting account of several new genera (5) and species (6). Of the new forms Kolga hyalina is perhaps the most interesting; it has been placed in the family Elpididæ, of the order Elasmopoda, instituted by Dr. Théel for some of the Holothurians collected during the Challenger Expedition. Kolga is a small Holothurian (the largest specimen dredged measuring 50mm. in length, 15-20mm. in height, and 12-15mm. in width) with the oral disk facing the ventral, and the anal orifice the dorsal, surface, and having a dorsal collar bearing sucker-like contractile papillæ at the anterior extremity. These papillæ, unlike ordinary pedicels, were found to communicate with the perivisceral cavity by means of spaces formed within the collar.

The Norwegian North Atlantic Expedition, 1876–1878.

Zoology: Holothurioidea. By D. C. Danielssen and Johan Koren. With Thirteen Plates and One Map. Annelida. By G. Armauer Hansen. With Seven Plates and One Map. (Christiania: Printed by Grondahl and Son, 1882.)