150 Part III. — Twenty- third Annual Report 



they could be made out, appeared to be closely similar to the correspond- 

 ing appendages in S. minuta. No males have yet been observed. The 

 Amphipod was obtained in a gathering of small Crustacea collected off the 

 east side of Inchkeith, Firth of Forth, in May, 1901. 



Sphceronella aorce, sp. n. PL xii., figs. 10-17. 



Female moderately large ; its outline, when seen from above, had an 

 obscurely quadrate appearance and was about as long as broad ; the head 

 forms a small rounded protuberance in front ; length '86mm. (about -^ of 

 an inch) ; ovisacs large (fig. 10). 



Antennules apparently four-jointed, but the end joint is very small ; 

 the penultimate joint, which is equal to about one 1 and a half times the 

 length of the one that precedes it, is furnished with a number of short 

 seta? (fig. 12). 



The first maxillipeds are uniarticulate, very robust, and armed with a 

 stout terminal claw (fig. 14). 



The second maxillipeds are moderately stout, elongated, and four- 

 jointed ; the second joint is as long as the third and fourth combined, 

 while the third is narrower than the second and rather longer than the 

 ultimate joint; terminal claw short and stout (fig. 15). 



The male, which measures about -28mm. has a somewhat close 

 resemblance to the male of Sphceronella chinensio, H. J. H.* The 

 cephalo-thoracic plate is widest posteriorly where the breadth is about 

 equal to the length ; the sides, which are nearly straight, converge towards 

 the proximal end, which is trilobed, the median lobe being larger than 

 that on either side, abruptly truncate in front and produced slightly 

 beyond the lateral lobes, which are bluntly rounded. Posterior portion 

 of the body short, semicircular in outline, and covered with short 

 bristles (fig. 11). 



The antennules of the male differ slightly from those of the female ; 

 they are rather shorter and stouter (fig. 13). 



The second maxillipeds differ considerably from those of the female ; 

 the second joint is moderately stout, but comparatively shorter than in 

 the second maxillipeds of the female, and furnished with two or three 

 transverse rows of short bristles ; the two end joints are slender, the 

 ultimate one being very small and bearing a moderately stout claw (fig. 

 16). 



The thoracic legs appear to be uniarticulate and armed with one long 

 and one short terminal seta (fig. 17). 



Habitat. — In the marsupium of Aora gracila (Bate), from a townet 

 gathering collected in the Dornoch Firth by Dr. H. C. Williamson, 

 which he kindly handed over to me for examination. 



Sphoeronella vararensis, sp. n. PI. xiii., figs. 12-15. 



This Sphceronella was found in the marsupium of an Amphipod, 

 Megaluropus agilis, Norman, captured in Burghead Bay, Moray Firth, by 

 Dr. H. C. Williamson, on Dec. 12, 1904, and kindly handed over to 

 me along with some other interesting things. One or two females of this 

 parasite were observed, but no males. The females are of an ovate form, 

 widest in the middle, and nearly one and a half times longer than broad ; 

 head somewhat produced and broadly truncate in front. The specimen 

 represented by the drawing measured ^mm. (about -^- of an inch) and 

 carried two ovisacs, each nearly as long as the parasite itself ; the ovisacs 

 were ovate in form, broadly rounded on the outer, but flattened on the 



*The " Choniostomatidae," by H. J. Hansen, pp. 106 and 112, PI. II. and PI. III. 



