78 



1 888. Crossop/ionis, Sars, Arch. Naturv., vol. 12, p. 182. 

 1896- Crossophonis, Brady and Norman, Trans. R, Dublin Socv 

 ser. 2, vol. 5, p. 643. 



Shell porcellanons, broadly rounded at hinder extremity ; 

 antennal notch overliung- l)y sul)acute rostral processes. First 

 antenna with second joint longer than third and fourth com- 

 bined; fifth joint with sensory appendage in both sexes- Second 

 antennae with three-jointed secondary appendage, its third joint 

 in the male falcate, clasping, in the female continuous with the 

 second joint and ending in a long seta. IMandibles five-jointed, 

 with strongly bifid hairy masticatory process on first joint, and 

 small bisetous exopod on the second. First and second maxillae 

 about as in Cypridiiia- Maxillipeds six-lobed, the penultimate 

 division forming a large sub-triangular lamina continuous on the 

 inner margin with the small apical lobe. Apex of vermiform 

 appendage variable, the armoured spines on these limbs numer- 

 ous- Caudal laminae having stout ungues interspaced with 

 slender ones, the graduation in the length of the ungues being 

 also discontinuous, althougli continuous for those of similar 

 stoutness, except that the hindermost is shorter than the penulti- 

 mate. 



In hisNeapolitanmonoeraph Dr. G.W.Muller dismisses this 

 genus as insufficiently described (p. 174, 1894). But this was 

 before the revision of it by Rrady and Norman had appeared. 

 Those authors had the opportunity of examining a female speci- 

 men 7 mm. long, taken by the Porcupine Expedition 

 of 1869, in the Atlantic, west of Donegal Bay, 

 Ireland, lat. 55° 11' N., long, il'' 31' W., in which the 

 genus was originally founded was a male, 84 mm. in 

 length, taken by the Challenger from a reputed deplth of IIOO 

 fathoms, bottom temperature 35°. 6 Fahr., a little to the East of 

 New Zealand, lat- 40° 28' S./long. 177° 43' E- That the two 

 specimens belong to the same genus cannot reasonably be 

 •doubted, and, notwithstanding the enormous interval between the 

 pla< f'S of capture, Brady and Norman assii.'n ilit-m to the same 

 species, CrossopJiflrus iinpcralor. That they are very nearly allied 

 may be readily allowed, but their specific identity is not so clear. 

 The Irish specimen appears to have the antennal notch more 

 widely open but considerably less deep than it is in the ,shfe^l 

 from the Pacific- In the figure of the latter it penetrates back 

 decidedly beyond the middle of the valves toward the dorsal 

 margin, while in the former it scarcely reaches the middle. Di's- 

 tally on its front margin the mandible has a row of 12 setae in the 

 Pacific specimen, but only 6 in that from the Atlantic. The little 

 apical lobe of the maxillipeds is well marked in the Pacific speci- 

 men. h'lt much lessdistinctintheother. Th*- vermiform appen- 

 dage of the male is dcscri1)ed as almost exactly like 'that of 

 Cypridina, whereas in the female '' at the extremity one lip is in 



