. Le Ingolf-Expedition danois. Expéditions scientifiques ; l'océan Arctique. [INOIDEA. II. 7' le même que le P.phiale de Wyv. Thomson du Rockall Channel, perd ainsi son intérêt d'un point de vue zoogéographique, puisque de toute façon cette espèce se produit vraiment à la fois dans le Nord de l'Atlan- tique et dans la mer de l'Antarctique. (Comp. Urechinus naresianus.) Cette espèce a été prise par l'Ingolf à les stations suivantes : 11. (64° 34'Lat N. 31° 12' de long. W. 1300 brasses 16 C. Bas temp.). 2 spécimens. - 40. (62° 00' 21" 36' S45 - 3°$ - - ) 1 -83. (620 25' - 28' 30 9i2 3°5 1 , la geographica

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. The Danish Ingolf-Expedition. Scientific expeditions; Arctic Ocean. [INOIDEA. II. 7' the same as the P.phiale of Wyv. Thomson from the Rockall Channel, thus loses its interest from a zoogeographical point of view, since in any case this species really occurs both in the Northern Atlan- tic and in the Antarctic Sea. (Comp. Urechinus naresianus.) This species was taken by the Ingolf at the following stations: St. 11. (64° 34'Lat N. 31° 12'Long. W. 1300 fathoms 1 6 C. Bottom temp.). 2 specimens. — 40. (62° 00' 21" 36' S45 — 3°$ — — ) 1 -83. (620 25' - 28 30' 9i2 3°5 _ , 1 _ The geographical distribution of the species is: Northern Atlantic (S. of Iceland, Denmark Strait) and Antarctic Sea. It will doubtless be found to occur all over the Atlantic Ocean. The bathy- metrical range, as hitherto known, is S45—1975 fathoms. The very interesting morphological relations of the bivium show that P.phiale is really one of the more primitive Pourtalesi;e, in spite of its modified form. The continuity of the ambulacra I and V it has in common with Sternopatagus and Pourtalesia carinata, which latter species through its two pores in the plates I. a. 1 and V. b. 1 as well as by its large labrum, maintains the place as the least modified of the Pourtalesia-species, (viz. among those species whose structure of the test is thus far known)1. Otherwise important light is thrown on the structure of P. carinata by what has here been made known of the structure of the actinal part of the test in P. pkiale. A comparison of the figure of the actinal side of P. phiale (PI.VI. Fig. 7) with the PI. VI. Fig. 42 of Loven's On Pourtalesia shows almost beyond doubt that the plates named by Loven 5. a. 2 b. 2 and V a. 2 b. 2 are wrongly interpreted. The plate named V. b. 2 is seen to agree very closely with the plate V. a. 2 in P. pkiale; but in case that plate is really Y. a. 2, which can scarcely be doubted, the plate named by Loven 5. a. 2 really becomes the ambulacral plate

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