2] 
Along the whole length of the body runs a deep groove on one side 
only. Length 8} inches, breadth } mill. 
Hab. Abdomen of Blaps obtusa, from the neighbourhood of Lon- 
don. Brit. Mus. 
When brought to the Museum it had just emerged from the Blaps, 
and was then 4 inches long and about the diameter of a horse-hair. 
It was placed in water and kept alive for a day or two, at the end of 
which time it had grown to double its original size, in both length 
and diameter. 
5. Gorpius sPH#RURA. (Annulosa, Pl. XXX. fig. 5.) 
Gordius spherura, Baird, Cat. Entoz. Brit. Mus. 112. 
Male: nearly black, quite smooth, flattened throughout its whole 
length, and nearly of equal size throughout. Length 16 inches, 
breadth 3 a line. 
Female: of a dark brown, smooth, but rather deeply. notched 
across, the notched lines occurring now on one side, now on another, 
but never going quite round the body, and at times presenting an 
appearance as if it were divided into numerous segments. The body 
is of nearly equal size throughout its length till it reaches the tail, 
which is somewhat swollen and club-shaped. Length 14 inches, 
breadth about J line. 
Hab. Khasyan Hills, India. Collected by Dr. Joseph Hooker. 
Brit. Mus. 
6. Gorpius rascratus. (Annulosa, Pl. XXX. fig. 6.) 
Body smooth, skin prettily shagreened with very fine lines cross- 
ing each other in opposite directions, of a light colour banded with 
broad patches of dark brown. Anterior extremity smaller than 
posterior, and roughened with raised circular ridges, which extend for 
about three lines, and as well as posterior extremity of a very dark 
colour, almost black. Length 113 inches, breadth about 1 milli- 
metre. 
Only one specimen ¢?. 
Hab. N. America. Brit. Mus. 
Order ACANTHOTHECA. 
Genus PENTASTOMA. 
1. PENTASTOMA MEGACEPHALUM. 
Pentastoma megacephalum, Baird, Cat. Entoz. Brit. Mus. 39.t.2.f.1. 
Female: body yellowish white, somewhat depressed and termi- 
nating anteriorly in a large, thick, club-shaped head. The dorsal 
surface is depressed at the edges, rounded and very prominent in 
the centre and transversely ridged. The ventral surface is more 
flattened, ridged and wrinkled ; with the mouth in a hollow depres- 
sion, surrounded by four strong, brown, simple hooks. The part 
of the body immediately beneath the head is very strongly ridged 
