

328 DR THOMAS SCOTT ON THE 



shown in the drawing (fig. 1 ) ; the length of the specimen represented by this drawing 

 is 2 mm. The siphon is short and subtriangular, and the mandibles are elongated and 

 slightly dentated on the inner edge near the apex (fig. 4). 



The antenuules are composed of nine joints ; the second joint is small, but the first 

 and third are elongated ; these three joints are together about half the entire length of 

 the antennule ; the next four joints are small, while the end one is about as long as the 

 preceding two joints combined ; a moderately long sensory filament springs from near the 

 extremity of the end joint (fig. 2). The antennae are composed of three joints ; the first 

 is elongated, and bears a small secondary branch ; the other two are shorter, and the end 

 one is furnished with a long, slender appendage, slightly hooked at the apex (fig. 3). 



The mandibles and maxillae are somewhat similar to the same organs in Artotrogus 

 orbicularis, Boeck. 



The first and second maxillipeds and the first three pairs of swimming feet are also 

 similar to those of the species mentioned. In the fourth pair of thoracic legs, the inner 

 ramus is more slender and rather shorter than the outer, and the end joint is provided 

 with a single plumose seta on the inner margin ; the same joint is furnished with two apical 

 sette, which are also plumose, and there is a minute bristle on the outer margin (fig. 8). 



The fifth pair are small, uniarticulate, and furnished with two terminal setae of 

 unequal length (fig. 9). 



Habitat. Scotia Bay, South Orkneys; collected in June 1903; Station 325, 

 60 43' 42" S., 44 38' 33" W. Two specimens occurred in a small sample of siftings from 

 trawled material. The species approaches so near to Artotrogus orbicularis, Boeck, both 

 in its general form and in the structure of its appendages, that there was at first some 

 doubt as to whether it should be regarded as a distinct species. A careful examination, 

 however, reveals certain differences, which it may be as well meanwhile to recognise, as, 

 for example, the difference in the armature, and to some extent also in the structure of the 

 antennae ; the difference in the form of the siphon ; the rather more slender maxillipeds ; 

 the difference in the form of the fifth pair of thoracic legs and in the structure of the 

 abdomen. These differences, while in themselves inconsiderable, are, I think, when 

 taken together, sufficiently important to warrant the separation of this Antarctic 

 Artotrogus under a distinct name. 



Fam. SAPPHIRINID^;. 

 Genus Sapphirina, J. V. Thompson, 1829. 



Sapphirina ovatolanceolata, Dana. 

 1849, Sapphirina ovatolanceolata, Dana, Proc. Amer. Acad., Boston, vol. ii. pp. 8-16. 



The only gatherings in which this Sapphirina was observed were collected at 

 Stations 14, 32, 36, and 49, 21 28' N., 22 40' W., to 1 53' N., 27 26' W., and at 

 Station 60, 3 25' S., 33 13' W., and Station 105, 38 45' S., 53 30' W. Only a few 

 specimens were noticed. 



(ROY. soc. EDIN. TRANS., VOL. XLVIII., 574.) 



