592 THE VOYAGE OF H.M.S. CHALLENGEE. 



1887. ROVALLIUS, C. 



Arctic and Antarctic Hyperids. With eight Plates. [Ur " Vega-expeditionens 

 vetenskapliga iakttagelser," Bd. IV., Stockholm, 1887.] pp. 545-582. 



In the introductory part Bovallius says, "In my opinion the limits of the zoo-geographical 

 regions must be taken more generally with regard to truly pelagic animals than regarding 

 the inhabitants of the depths and the shores. Therefore I shall fix the southern limit of 

 the Arctic region at Lat. 60° IS"., and the northern limit of the Antarctic region at 

 Lat. 50° S. Certainly a part of the Gulf Stream will thus be included within the limits of 

 the Arctic region, but this seems to do but little harm, as is shown by the diagram of the 

 geographical distribution of the species given below." Then tracing the history of the 

 discovery of Arctic and Antarctic Hyperids, he says, " after reducing the various synonyms 

 to the names, which in my opinion are the true ones, we find in the above cited literature 

 altogether 15 species mentioned from the arctic region, viz., Tyro horealis G. O. Sars. 

 Lanceola Lovini C. Bovallius. Lanceola Clausi C. Bovallius. Hyperia medusarum 0. F. 

 MtiUer. Hyj^eria Latreillei H. Milne-Edwards. Hyperia galba Montagu. Hyperoche 

 Kroeyeri C. Bovallius. Hyperoche abyssorurn A. Boeck. Parathemisto ohlivia Kroyer. 

 Parathemisto conijnvssa A. Goes. Parathemisto abyssorurn A. Boeck. L'uthemisto 

 liheMula Mandt. Eutliemisto hispinosa A. Boeck. ? Euthemisto Nordenskioldi C. Bovallius. 

 Tryphxiia Malmi A. Boeck. From the antarctic region 10 species, viz., Cyllopus magel- 

 lanicus Dana. Cyllopus Lueasi Spence Bate. Cyllopus Danx, Spence Bate. Tauria 

 maerocephala Dana. Parathemisto trigona, Dana. Euiheviisto Gaudichaucli Guerin. 

 Euthemisto antarctica, Gu(5rin [Dana]. Aiichylomera abhreviata Spence Bate. Anchylomera 

 antipodes Spence Bate. Thamyris antipodes Spence Bate." In this paper the number of 

 the Arctic species is raised to twenty-two, and the Antarctic to thirteen. 



In the descriptive part, Clydunia borealis, Sars, 1S82, becomes Tyro horealis. Brief descriptions 

 are given of "Tyro Clausi" PI. 40, figs. 1-3, " Syn. 1885. Tyro Clausii, C. Bovallius;" 

 ''Tyro Tidlbergi," PI. 40, figs. 4-10, "Syn. 1885. Tyro Tullberyii, C. Bovallius;" 

 "Lanceola Clausi," PI. 41, figs. 11-14, "Syn. 1885. Lanceola Clausii, C. Bovallius;" 

 "Lanceola Loveni, C. Bovallius," 1885; "Lanceola serraia, C. Bovallius," 1885; 

 " Vibilia Kroeyeri, C. Bovallius," 1887; " Cyllopus rnagellaniais, Dana, 1852;" " Cyllopus 

 Lueasi, Spence Bate, 1862. Syn. 1862. Cyllopius Lticasii, Spence Bate"; "Cyllopus 

 D«M«, Spence Bate, 1862;" " Cyllopus armatus, C. Bovallius, 1887. PI. 41, fig. 15-25;" 

 " Thaumatopis longipes, C. Bovallius, 1886," on which Bovallius remarks, "One specimen 

 taken just at the southern limit of the Arctic region, at Lat. 59° 38' N.; Long. 5° 24' W. 

 The other known specimen is taken off the western shore of the Australian mainland. 

 Indeed a wide distribution for the species;" "Mimonecies Steenstriipi," PI. 47, figs. 111- 

 115. "Syn. 1885. Mimonectes Steenstrupii, C. Bovallius;" " Hyperia medusarum, O. F. 

 MuUer, 1776. PI. 42, fig. 26-33 ; " " Hyperia Latreillei, H. Milne-Edwards, 1830. PL 42, 

 fig. 34-39; PI. 43, fig. 40-46; Hyperia galba, Montagu, 1813. PI. 43, fig. 47-54;" 

 " Hyperoche Kroeyeri, C. Bovallius, 1 885," which would rather seem to be entitled to the 

 name Hyperoche medusarum, since Bovallius gives as its earliest synonym " Metoecus 

 medusarum, Kroyer," 1838; "Hyperoche abyssorurn, A. Boeck, 1870. PI. 44, fig. 55-62," 

 the opinion of Sars, 1882, that this is the same species as the preceding, not being noticed ; 

 "Hyperoche LnHkeni,Q. Bovallius, 1887. PL 44, fig. 63-71;" " Hyper iella antarctica, 

 C. Bovallius, 1887. PL 45, fig. 72-80;" "Parathemisto abyssorum, A. Boeck, 1870. 

 PL 45, fig. 81-89;" "Parathemisto compressa, A. Goes, 1865," transferred from Themisto 

 by Boeck in 1870; " Parathemisto oblivia, KroeyeT, 1838," transferred from Hyperia by 

 Bovallius in 1887; "Parathemisto trigona, Dana, 1852," in like manner transferred by 



