AMPHIPODA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 195 



I have examined a mounted slide of O. cavimanus Stebbing in the British Museum. 

 The palm of the second gnathopod is hardly so oblique as shown in the figure of the 

 whole appendage in the Challenger Report, but is distinctly concave, the finger imping- 

 ing against a rather narrow projection of the propod and being thus separated from 

 the rest of the palm. This structure seems rather more marked in the one gnathopod 

 than in the other of the same specimen, and the dift'erence from typical specimens of 

 0. chilensis is not greater than, or indeed so great as, that of the specimens from South 

 Africa mentioned above, and the other parts of the specimen seem to agree well with 

 that species. In the same way, 0. excavata Chevreux, from the Atlantic, might perhaps 

 also be looked upon as only a form of the widespread 0. chilensis Heller, but I have 

 not been able to examine specimens of O. excavata. 



OrCHOMENOPSIS (?) COATSI, sp. nov. (PI. I. figs. 8-9.) 



Station 411, Coats Land, lat. 71° 1' S., long. 22° W. ; 161 fathoms. 12th 

 March 1904. Many specimens, about 13 mm. long. 



In general possessing the characters of an Orchomenopsis, but difi"ering markedly 

 in the first gnathopoda (fig. 8), which are long and very slender. The basos is long, 

 slender, but expanding at the middle so as to be elongate fusiform ; the ischium is fully 

 half as long as the basos ; merus shorter ; carpus about as long as the ischium, slender ; 

 pro2:)od longer than the carpus but not broader, narrow, oblong, about four times as long 

 as broad ; palm a little oblique ; small tufts of setaj on the propod toward the distal end. 



The second gnathopod (fig. 9) is of the form normally found in the genus ; the carpus 

 is expanded so that the posterior margin is strongly convex, both margins being furred ; 

 the propod is much shorter than the carpus, narrowed at the base ; palm short, trans- 

 verse or a little projecting ; the margins of the propod are furred, and supplied with long 

 setae in the usual manner. 



Remarks. — The first gnathopoda of this species differ so much from those of other 

 species of Orchomenopsis that it should perhaps be classed in some other genus, but 

 I cannot find any genus that seems more appropriate, for in all the other characters 

 it is closely similar to a typical species such as 0. chilensis, and I therefore prefer to 

 place it provisionally under Orchomenopsis rather than to add another genus to the 

 Lysianassidse. 



Genus Harpinia Boeck, 1871. 



Harpinia ohtusifrons Stebbing. 



Harpinia ohtusifrons Stebbing, 1888, p. 820, pi. Ivi., and 1906, i>. 143. 

 „ „ Walker, 1907, p. 17. 



Chilton, 1909a, p. 619. 



South Orkneys, Scotia Bay, Station 325 ; dredge, 9-10 fathoms. iMay 1903. 

 One female, 4 mm. long ; another female (from Scotia Bay), 7 mm. 



(ROY. SOC. EDIN. TRANS., VOL. XLVIII., 477.) 



