342 Rev. T. R. R. Stebbing on AmpMpodoas Crustaceans. 



(Brit. Sess. Crust, vol. i. p. 86) as found on the antennse of 

 Lysianassa longicornis^ and (Ann. & Mag. Nat. Hist. ser. 4, 

 vol. XV. Jan. 1875) also on those of BatJiyporeia pilosa (see 

 also Brit. Sess. Crust, vol. i. p. 92). The anterior lateral 

 angle of the head is much produced and rounded. The first 

 gnathopods are short and stout. The hand, which is widest 

 at the base, is longer than the wrist ; the triangular wrist is 

 slightly produced behind at the base of the hand. The second 

 gnathopods are long and very slender, the thighs being equal 

 in length to hand, metacarpus, and wrist put together. For 

 the rest, these limbs and the last three pairs of walking-legs 

 are so fully described in the ' British Sessile-eyed Crustacea,' 

 under the two species already cited, that nothing need be added. 

 Of the two intermediate pairs, it is said uwdiox Anonyx Edwardsi 

 that they are small, under Anonyx minutus that they are tole- 

 rably robust. Both statements may be accepted together, espe- 

 cially as from the figure oi A. Edicardsiit would seem that 

 the metacarpus, which is the robust part of the limb, had not 

 been observed in the specimens described under that name. 

 It is the custom of these animals to keep both gnathopods and 

 the first two pairs of walking-legs, together with the long 

 lower antennas, closely hidden between the deep cox«, so that 

 in general their true characters can only be observed by dis- 

 section. The third segment of the pleon has the hinder margin 

 very slightly serrated ; the hinder margins of the two follow- 

 ing segments are partially serrated. The first of these has a 

 depression in the upper margin near the base, which passes 

 beneath the preceding segment ; its hinder margin is gibbous. 

 The fifth segment has the upper margin curved and passing 

 under that of the fourth ; its hinder margin likewise presents 

 a gibbosity. The sixth segment is squared above like the 

 corresponding portion of Lysianassa longicornis^ the whole 

 tail-piece of which bears a marked resemblance to that of the 

 animal now under discussion. The telson appears to be more 

 or less cleft. The last pair of caudal appendages have the 

 peduncle short and stout, the branches subequal, the lower 

 being rather the longer, both adorned on the upper serrated 

 margins with long cilia and armed below with short spines. 



The same dredging which supplied the specimen now de- 

 scribed yielded numerous specimens in which no differences 

 from it could be detected, except that they were in various 

 degrees smaller, that the last caudal appendages were not 

 plumose, and that they did not possess the long calceola- 

 taearing flagella of the lower antenna?. On the other hand, 

 they did exhibit the same shape and ornamentation of both 

 pairs of gnathopods ; the upper antennge, with their inner 



