EEPORT ON THE AMPHIPODA. 621 



Length. — The specimen, in the position figured, measured, without the antennae, 

 three-quarters of an inch ; with the outstretched antennae, an inch. 



Locality.— ^toXion 150, off Heard Isknd, February 2, 1874; lat. 52° -1' S., 

 long. 71° 22' E.; depth, 150 fathoms; bottom, coarse gravel; bottom temperature, 

 35° '2. One specimen, female. Dredged. 



Remarlcs.—T\ie specific name refers to the singularly stout and stiff antennee. 



This species agrees well with Boeck's definition of his genus Tri/j^hosa, except that 

 the outer plate of the maxillipeds does not reach beyond the second joint of the palp, in 

 which respect it agrees better with his definition of the genvis Anonyx; on the apex the 

 plate in question is armed with the requisite two spines, but it has more than two. In 

 Anonyx the inner plate of the second maxillae is much shorter than the outer plate, 

 which is not the case in Tryphosa, but beyond this it is not easy to find any character 

 on which absolute reliance can be placed for distinguishing the two genera. Boeck, in 

 his account of TrypJiosa, compares it only with Orchomene, but when discussing the 

 genus Ayionyx, he says,^ "the mouth-organs in this genus show a certain agreement with 

 those in some of the following genera, especially in Orchomene, Tryphana \J Onesimus], 

 and Tryphosa; the upper lip in them all is helmet-shaped and covers the tips of the 

 mandibles with its thickened end. These genera differ, however, from one another in the 

 form of the other mouth-organs, the antennae, the two pairs of gnathopods, and the 

 telson. Thus, the mandibles in Anonyx are very strong but not especially elongate, 

 with a long but narrow molar tubercle, and the palp is fixed nearer the end than the 

 molar tubercle. The first maxillae are also very broad, but the inner plate is very short, 

 only a little longer than broad, with two strong plumose setae on the apex. The plates 

 of the second maxillae are also short but broad ; the outer plates of the maxillipeds 

 are very large, and have on the rims a close row of small nodules. The third joint of 

 the lower antennae is short, and the first gnathopods are more or less elongate. The 

 telson is also elongate, longer than the peduncle of the last uropods, and deeply cleft. 

 The body is also on the whole tolerably elongate, and the fifth side-plate accordingly 

 longer than deep." 



Tryphosa harhatipes, n. sp. (PL VII.). 



The lateral lobes of the head much produced and sharply angled. 



Postero-lateral angles of the third pleon-segmeut not acute and yet scarcely rounded. 

 Fourth pleon-segment with a dorsal depression. 



Eyes not discerned. 



Upper Antenna;. — First joint tumid, second and third short, the thii-d, as is often the 

 case in the Lysianassidae, excavate below ; flagellum of ei^ht jc ints, ' he first large, slightly 



1 De Skand. og Arkt. Amph., p. 151. 



