Fig. 
Fig. 
. Nymphon robustum, Bell ; part of the intestine; magnified 47 diameters. « 
REPORT ON THE PYCNOGONIDA. 159 
. Colossendeis proboscidea, Sab, (sp.) ; ventral half of the body with the nervous 
system ; magnified 6 diameters. a, parts of the intestine 3p, palpus; I. IT.~ 
V., first to fifth thoracic ganglia ; np. and n.pr., two branches of the palpar 
“nerve ; 7.0.1, nerve for the ovigerous leg; n'—n‘, four nerves for the legs ; 
n.a., nerves for the abdomen. 
. Nymphon robustum, Bell; ventral half with the nervous system ; magnified 6 
diameters. a, parts of the intestine, cceca, &c. ; m.U., muscles running from 
the one segment to the other; n.p., palpar nerve ; 7.pr., proboscideal nerve ; 
n.0.1., n'—n*, na., as in fig. 2. 
. Nymphon robustum, Bell; supracesophageal ganglion with its nerves ; magnified 
6 diameters, a, intestine ; m, mandibles ; g.s.0., supracesophageal ganglion ; 
c, esophageal commissures; n.m., nerve for the mandibles ; w.p.n., unpair 
proboscideal nerve; p.p.v., small proboscideal nerves; g.p., proboscideal 
ganglion. 
. Nymphon robustum, Bell; dorsal half of the body showing the intestine; mac- 
nified 4 diameters. a, intestine ; e, cesophagus. 
> 
intestine ; e, cesophagus ; gl, intestine glands. 
PLATE XVIII. 
. Integumentary cavities of Colossendeis leptorhynchus, Hoek ; $ specimen ; first 
tibial joint; magnified 287 diameters. 7, part of the wall of the intestinal 
coecum ; ¢, septa of connective tissue ; b, blood-corpuscles ; d, and d’, glandu- 
lar cells. 
. Transverse section of the fourth joint of the leg of Colossendeis proboscidea, Sab. 
(sp.);_ 3 specimen ; magnified 47 diameters. 7, intestinal coecum ; g, glands; 
t, testis; c, fibres of connective tissue. 
- Part of the integument of Colossendeis proboscidea, Sab. (sp.) ; fourth joint of 
the leg ; 3 specimen ; magnified 272 diameters. ¢, integumentary cavity ; g, 
gland; d, duct of the gland, 
. GAsophageal ring of Colossendeis megalonyx, Hoek ; magnified 40 diameters. 
Ss. supracesophageal ganglion ; c, commissures; ¢, first thoracic ganglion ; 
pr. azygous proboscideal nerve ; m, mandibular nerve ; 0, optic nerves (2); ¢’, 
first nerve arising from the first thoracic ganglion; ¢”, second nerve (one of 
the three main proboscideal nerves), dividing into two branches after pene- 
trating the proboscis ; pa., palpar nerve (dividing in two branches close to 
the ganglion) ; 0, nerve for the ovigerous leg; c’, commissures between the 
first and second thoracic ganglia. 
