480 



anterior, with the carpus narrower and scarcely expanded below, propodos 

 not exceeding the latter in length, and oval triangular in form, with the 

 palm more distinctly defined. The 2 anterior pairs of pereiopoda very 

 strongly built, and of a peculiar rigid appearance, meral joint much prolonged, 

 exceeding in length the 2 outer joints combined, carpal joint gradually 

 widening distally, and forming posteriorly a rounded expansion armed with 

 5 strong spines, propodal joint somewhat longer than the carpal one, and not 

 produced posteriorly to any thumb-like projection, dactylus strong and curved, 

 being adapted to impinge against the spines of the carpal joint. The 3 

 posterior pairs successively somewhat descreasing in length, and having the 

 outer part built in exactly the same manner as in the 2 anterior pairs, basal 

 joint of antepenultimate pair the largest, and oblong oval in form, that of 

 penultimate pair exhibiting at the base posteriorly an angular projection, 

 that of last pair rather narrow, nearly linear in form. Last pair of uropoda 

 extending somewhat beyond the others, rami scarcely twice the length of the 

 basal part, and narrow lanceolate in shape. Telson rather large and oblong 

 in form, a little more than twice as long as it is broad, cleft very narrow 

 and extending nearly to the base, terminal lobes obtusely pointed, with one 

 apical and 3 marginal spines, and in addition 3 subdorsal ones. Colour more 

 or less dark brownish, with a series of pure white patches on each side, 

 caused by some opaque matter lying inside the integuments; ova in the 

 marsupial pouch very dark-coloured. Length of adult female scarcely 

 attaining 6 mm. 



Remarks. This form was first recorded by Sp. Bate in the year 



1862 as Aft/In* (jiUx^n* and was subsequently described under the same name 

 in his work on the British sessile-eyed Crustacea. Boeck, however, justly 

 pointed out its material difference from the species of that genus, and stated 

 that this form, in the structure of the oral parts, is in fact much more nearly 

 related to the genus Dexamine, though in other respects exhibiting sufficient 

 difference to be regarded as the type of a separate genus. From the 2 

 antarctic forms described by the Rev. Mr. Stebbing, the northern species is 

 at once distinguished by the rather different shape of the propodal joint of 

 the pereiopoda, which in the 2 former species is produced posteriorly to a 

 thumb-like projection, against which the dactylus is allowed to impinge, 

 whereas in T. gihbosa this joint is quite simple. The form recorded by Grube 

 as Dexamine lrrrif(ir*i.t, I regard as identical with the present species. 



Occurrence. This peculiar Amphipod would seem to be rather rare 

 off the coast of Norway. I have only met with it rather sparingly in 2 places 

 on the west coast of Norway, viz., Skudesnaes and Korshavn, in moderate depths 

 ranging from 10 to 30 fathoms. Boeck found it likewise only in a few 



