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had been able to observe, as there is absolutely no existing record of 
which are British species. I have not hitherto had time to accom- 
plish this, but I now do so ; I have also endeavoured to elucidate 
the synonymy, which, in my opinion, is greatly in want of it ; and I 
have described some of the principal new species in my possession. 
I really have several others ; but to properly illustrate them all would 
require more plates than can he allotted to this paper. I have also 
made some further observations on the anatomy of one species. 
The Uropodinae are a well-marked sub-family of the Gamasidae ; 
Berlese in his late work, hereinafter referred to, distinguishes them 
from other Gamasidae by the genital plate of the female being wholly 
surrounded by the sternal plate ; this does not seem to me to be a 
good means of differentiating them. The genital plate is iu the same 
position as in most other Gamasidae ; if the sternal plate has the 
appearance of surrounding it it is only because in most Uropodinae 
all the ventral plates except the genital which is required to be 
movable, are fused ; and it is impossible to say where one ends and 
the other commences. Moreover, the genital plate is partly sur- 
rounded by the sternal in many other Gamasidae. 
To me the essential characters of the Uropodinae seem to be, first, 
that the camerostoma (camerostrum) or opening for the passage of 
the oral tube (in effect the rostrum) is in the ventral surface, and 
that the dorsal surface projects beyond it, so that it is hidden on the 
under-side of the creature ; whereas the oral tube when exserted forms 
an anterior continuation of the body in other Gamasidae. Second, 
that the first pair of legs are inserted actually within the same opening 
as the oral tube instead of at the side of it. To these principal 
characters should be added that the Uropodinae are possessed of very 
long and slender mandibles, with small and fine chelae, similar in 
the two sexes ; and that the genital opening of the male is within 
Plate YII. ( continued ). 
Fig. 7. — Alimentary canal, &c., 9 , x 85. ce, oesophagus, hr, brain, v, ventriculus. 
cas , cae, larger caeca of the ventriculus. c, colon, r, rectum, mv, Mal- 
pighian vessels. 
„ 8. — Genital organs of the male, X 85. cr, chitinous ring with supporting 
pieces, ga , genital aperture, de , ductus ejaculatorius. vs, central 
chamber or vestibule (vesicula semiualis?). t, t, testes, ag, accessory 
gland, gl, oil-glands. 
„ 9. — Epigynium (external genital plate of 9 ) seen f rom within, x 85. mp, mem- 
branous portion. 
„ 10. — Perigynium (inner membranous genital plate of 9 ) seen from below, X 170. 
The spines are seen through the membrane. 
„ 1 1. — Coxa, &c., of the second leg, with the coxal gland and duct in situ, x 85. 
„ 12. — Coxal gland and duct seen on edge, x 170. 
„ 13. — One of the two largest racemose glands, x 350. 
„ 14. — One of the expulsory vesicles. X 350. 
„ 15. — Peritreme, x 175. 2, excavation for second leg. 3, ditto for third leg. 
r, ridge between the two. p, peritreme. 
