150 Part I1I.—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. 
Spheronella aorw, sp. n. Pl. xii., figs. 10-17. 
Female moderately large ; 1ts 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 and a half times the 
length of the one that precedes it, is furnished with a number of short 
sete (fig. 12). 
The first mexillipeds 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 Spheronella 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. 
Spheronella vararensis, sp. n. Pl. xiii, figs. 12-15. 
This Spheronella 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 10 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 ‘53mm. (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 ‘‘ Choniostomatide,” by H. J. Hansen, pp. 106 and 112, Pl. II. and Pl. III. 
Mi » PP 
