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



14 mm.," very near to Afetopa aldm, Sp. Bate, but "let alone the far greater size, it can 

 iinmeJiatel^^ be recognized by the very uner[ual development of the 2 pairs of antennae — 

 perfectly uniform in both sexes ; whereas the antennae (in the female of M. Alderi at least) 

 are about equal in length ; moreover, by the armature characterizing the hand of the 2nd 

 pair of legs ; and finally, by the 3rd joint of the hindmost pair of legs being less ddated 

 posteriorly." Sars notes that he has well-marked specimens from Hammerfest, " which are 

 indeed a good deal smaller." 66. Metopa eeqvicornis, "length 7 A mm.," distinguished from 

 Mefcqia S2Kdahilis "by its inferior size, as also by the greatly elongated and equally 

 developed antenns. From M. longicomis, Boeck, which, in the appearance of the antennae, 

 approximates closest the present species, it differs by the greater elongation of the 2nd joint 

 of the 1st pair of anteimEe, as also by the different form and armature of the hand of the 

 2nd pair of legs." Gen. 2. Danaia, Sp. Bate, 1862, ■ndth Cressa, Boeck, for a synonym. 

 57. Danaia ahyssicola, differs from Danaia duhia, Sp. Bate, and Danaia minuta, Boeck, 

 " by the total want of eyes, the remarkably elongated first pair of antennae, and by the 

 form of the first pair of legs." As the oral appendages could not be examined, it remains 

 uncertain whether this species agrees with Bate's account of Danaia or Boeck's of Cressa. 



Fam. Leucothoidae. Gen. 1. Lilljehorgia, Sp. Bate, 1862. 58. Lilljehorgia xqvicornis, marked 

 " by its want of distinctly developed eyes, by the presence of only one dorsal spine, by the 

 uniform development of the antennae, and finally by the peculiar structure of the first pair 

 of legs in the male." The generic name is properly Liljeborgia. Gen. 2. Tntropis, Boeck, 

 1870. 59. Tritropis ajypenJ indata, " the form treated of here exhibits in some respects 

 a rather striking deviation from the other species referred to the genus Tritrojm, and may 

 possibly be found to constitute a separate genus." See Note on G. 0. Sars, 1880. No. 27. 



Fam. Ampeliscidse. Gen. Ampelisca, Kroyer, 1842. 60. AmpeJisca odonfnpJax, "length 

 24 mm.," distinguished " by its total want of eyes and the peculiar dentiform projection on 

 each of the three anti-rior pairs of epimera, a character that suggested the specific 

 designation," "presenting in its outer habitus closest resemblance to A. gpinipes, Boeck." 

 61. Ampelitira minidicornis, "length 8 mm.," to be recognised "by the unusually small 

 antenna3, its want of eyes, as also the considerable size of the expansion distinguishing the 

 basal joint of the last pair of legs posteriorly." Gen. 2. ByhJis, Boeck, 1870. 62. ByUis 

 abyssi, " differs from the typical species, B. Gaimardii Kroyer, by the total want of eyes 

 and the much less elongate head," and is distinguished from Byblis crassicornis, Metzger, 

 "by the somewhat different structure of the ani^ennfe and the caudal stylets," which "are 

 all uniform in structure, vnth simple lanceolate and naked branches. They diminish 

 successively in length backwards, and roach therefore, when stretched back, to about the 

 same transverse line." 



Fam. Microdeutopidae. Gen. Auionoe, Bruzel, 1859. 63. Autonoe megacheir, "distinguished 

 from the other two Norwegian species by its total want of eyes, the greatly elongated basal 

 joint of the 1st pair of antennae, and the structure characterizing the 1st, and in part too, 

 the 3rd and 4th pairs of legs, as also by their far less dense armature of bristles." 



Fam. Podoceridae. Gen. 1. Podorerus, Leach, 1815. 64. Podoreru,'< amniiUs, nearest Pudocerm 

 megacheir, Boeck, " but differs from that animal in having a somewhat robuster form of 

 body, larger epimera, the rudimentary character distinguishing the secondary flagellum of its 

 1st pair of antennaj, as also in the lateral plates of the 3rd abdominal segment not being 

 angular, but obtusely rounded posteriorly." 65. Podorerus brevicornis, somewhat resembles 

 Podocerus latipes, Kroyer, but differs " in its want of eyes, the pointed lateral corners of the 

 head, the shorter and less abundantly bristle-beset antennw, as also in a somewhat deviating 

 form distinguishing the 2 foremost pairs of legs." 66, Podocerus tenuicornis, " Podocenis 

 longicornis, G. 0. Sars. Crust. & Pycnog. nova etc., No. 38 (non Heller)," "length 3 mm.," 

 a species " distinguished from the 2 preceding ones by its remarkably elongate and slender 



