]18 l^rr. A. Patience on the 



1895. Trifcsta cjihhosa (Bate), ,5 as = doUchom/.r, Nebeski, A. O. 



Walker, Rev. Amphi. L. M. B. C, p. 306 (separate copy). (i6.) 

 1900, Trit(cta (phbosa (Bate), (5" as = dolichotiyx, Nebeski, Stebbing, 



Das Tierreicb, Ampbi. Gam. p. 518. (17.) 

 1906. Tritceta gibhosa (Bate), c? as = dulichomjx, Nebeski, Nomian & 



Scott, Crustacea of Devon & Cornwall, p. 77. (18.) 



While examining lately some Amphipoda I had taken in 

 the Firth of Clyde last summer I came across some speci- 

 mens of Dea-amine thea, Boeck, in which the propodal joint 

 of the first gnathopods was peculiarly constructed, having 

 a deep sinus on the upper margin, and in this respect 

 showing an approach to the structure of the same joint of 

 the first gnathopods of the male o£ Tritata gibhosa (Bate). 

 This peculiarity I found to obtain in the male sex only. 



Boeck, in his descriptions of the species (i, 3), makes 

 no mention of this sexual character, the male evidently not 

 having come under his observation. Nebeski (4) seems to 

 have been the first to observe the peculiar formation of the 

 hand of the first gnathopods in D. thea, but evidently being 

 unaware of Boeck's description of this species, he redescribed 

 it under the naxwQ oi Dexamine dolichonyx, n.s. The Rev. 

 Thos. R. R. Stebbing (12), ha^dng in view the peculiar hand- 

 formation of the male of Tritceta gibbosa, assumed that 

 Nebeski was in error in referring dolichonyx to the genus 

 Dexamine, and remarks : " The deep narrow cavity in the 

 back of the hand of the second gnathopod was only found 

 in the two male specimens, not in the females. A specimen 

 of this curious species, from the Clyde, sent me by Mr. David 

 Robertson, of Glasgow^, shows in the perseopods a short hand 

 and wrist preceded by a very long joint, which is character- 

 istic of Boeck's genus Tritata. The species should, I think, 

 be named Tritata dolichonyxy Nebeski's figure, however, 

 of the extremity of the second pereeopod (fig. 40) makes it 

 clear that he was right in ascribing the species to Dexamine. 

 Moreover, a reading of the text "das 2., 3. und 4. Segment 

 des Abdomens am dorsalen Hinterrande in einem spitzen 

 Zahn ausgezogen,"' which Stebbing himself quotes, puts the 

 matter, I think, beyond doubt. The tooth on the Jirst 

 segment of the metasome is rarely nearly obsolete, especially 

 in the male, and this probably accounts for Nebeski having 

 failed to notice it on that segment. 



Mr. Stebbing has as lately as 1906 (17) included '-'Dexamine 

 dolichonyx, Nebeski," in his synonymy of Tritceta gibbosa 

 (Bate). 



Mr. A. O. Walker (13) has also erred in this matter. He 

 records " Tritceta dolichonyx, Nebeski,-" from Puffin Island 

 and Port Erin, Isle of Man (p. 241), and in a note (p. 249), 



