732 THE VOYAGE OF H.M.S. CHALLENGER. 



of 345 and 775 fathoms, and in the Sea of Banda, associated with Acanthephyra rouxii, 

 at 200 fathoms, where also Acanthephyra armata was captured. This latter species is 

 also reported by A. Milne-Edwards from Mexico at 422 fathoms, and he has also described 

 two other species from the G-ulf of Mexico under the names of Acanthephijra debilis 

 and Acanthephyra cnsis, off the Bahama and Barbados Islands, at the respective depths 

 of 500 and 237 fathoms. 



Acanthephyra breviwstris was taken in the North Atlantic, in 1500 fathoms 

 of water, and Acanthephyra longidens was found off the north-western extremity of 

 Celebes at a depth of 2150 fathoms, and at the very middle of the South Pacific 

 Ocean at 2375 fathoms. Acanthephyra media was taken off Tablas Island, among 

 the Philippines, at a depth of 700 fathoms. Acanthephyra hingsleyi was taken in 

 Mid Atlantic at 2500 fathoms, just under the equator, and not far from the Stations 

 where Acanthephyra acanthitelsonis was found. Acanthephyra carinata and Acanthe- 

 phyra approxima were taken in narrow channels between the islands and the continent 

 of South America on the western coast of Patagonia, at a depth of 400 fathoms. 

 At all these localities the bottom was of a soft mud or Globigerina ooze, except in one 

 instance off the Kermadec Islands, and once in the Atlantic, at Station 87, where the 

 bottom w T as rocky. 



The geographical range of this genus is almost cosmopolitan, but does not include the 

 Arctic regions. Specimens have been found in the West Indies, among the islands of the 

 Australian Archipelago, as far north as Japan, as far south as Kerguelen Island, and in 

 the middle of the Pacific and Atlantic they have been taken at depths ranging from 200 

 to 2500 fathoms. 



Observations. — A form closely allied to this genus was first described by Risso, under 

 the name of Pandaltis pielagicus, from a specimen taken in the Mediterranean. This 

 name was afterwards changed by Eoux, who more correctly demonstrated its true 

 position in natural classification, to Ephyra, and this was retained by Professor Milne- 

 Edwards. 1 More recently Professor Kingsley 2 pointed out that the name given by Roux 

 had been previously adopted for another genus, and proposed the name of Miersia for 

 Risso's species. But, judging from the description of Risso as quoted by Milne-Edwards, 

 Ephyra pelagica " is ornamented on the sides by a curved suture with four spines and 

 a channelled rostrum, armed with five teeth above and two and a fringe of cilia below." 



Kingsley, moreover, places Miersia as the type of his Eryphinas, making it a subfamily 

 of Atyidse, which, he says, " have the mandibles stout, non-palpigerous, with the crown 

 broad, dilated, and slightly divided," neither of which characters correspond with those 

 in the several species described under the name Acanthephyra of A. Mdne-Edwards. 



Acanthephyra of A. Milne-Edwards is not ornamented with a curved suture, unless 

 one or two irregular depressions, as seen in Acanthephyra armata, but not universally 



1 Hist. Nat. Crust., torn. ii. p. 422. 2 hoc. cit. 



