REPORT ON THE PYCNOGONIDA. 159 



Fig. 2. Colossendeis lirohoscidea, Sab. (sp.) ; ventral liaK of the body with the nervous 

 system ; magnified 6 diameters, a, parts of the intestine ; p, palpus ; I. II.- 

 V., first to fifth thoracic ganglia ; n.p. and n.pr., two branches of the palpar 

 nerve ; n.o.l., nerve for the ovigerous leg ; ??^-n*, four nerves for the legs ; 

 n.a., nerves for the abdomen. 



„ 3. Nymphon robustwn. Bell ; ventral half with the nervous system ; magnified 6 

 diameters, a, j^arts of the intestine, <;oeca, &c. ; m.ii., muscles running from 

 the one segment to the other ; n.p., palpar nerve ; n.pr., proboscideal nerve ; 

 n.o.l., 11^-11*, n.a., as in fig. 2. 



,, 4. Nympihon rohustum. Bell ; supraoesophageal ganglion with its nerves ; magnified 

 6 diameters, a, intestine ; in, mandibles ; g.s.o., supraoesophageal ganglion ; 

 c, oesophageal commissures; n.m., nerve for the mandibles; u.p.n., ma'paiv 

 proboscideal nerve; p.p.n., small proboscideal nerves; ^r.jj., proboscideal 

 ganglion. 



„ 5. Nymphon rohustum, Bell ; dorsal half of the body showing the intestine ; mag- 

 nified 4 diameters, a, intestine ; e, oesophagus. 



„ 6. Nymphon rohustum. Bell ; part of the intestine ; magnified 47 diameters, a, 

 intestine ; e, oesophagus ; gl, intestine glands. 



PLATE XVIII. 



Fig. 1. Integumentary cavities of Colossendeis leptorhynchus, Hoek ; $ sj)ecimen ; first 

 tibial joint ; magnified 287 diameters, i, part of the wall of the intestinal 

 coecum ; c, septa of connective tissue ; h, blood-corpuscles ; d, and d' , glandu- 

 lar cells. 



„ 2. Transverse section of the fourth joint of the leg of Colossendeis prohoscidea, Sab. 

 (sp.) ; $ specimen ; magnified 47 diameters, i, intestinal coecum ; g, glands ; 

 t, testis ; c, filires of connective tissue. 



„ 3. Part of the integument of Colossendeis prohoscidea, Sab. (sp.) ; fourth joint of 

 the leg ; $ specimen ; magnified 272 diameters, c, integumentary cavity ; g, 

 gland ; d, duct of the gland. 



„ 4. CEsophageal ring of Colossendeis megalonyx, Hoek ; magnified 40 diameters, 

 s. supraoesophageal ganglion ; c, commissures ; t, first thoracic ganglion ; 

 ])r. az}-gous proboscideal nerve ; m, mandibular nerve ; o, optic nerves (?) ; t', 

 first nerve arising from the first thoracic ganglion ; t", second nerve (one of 

 the three main proboscideal nerves), dividing into two branches after pene- 

 trating the proboscis; jxt., palpar nerve (dividing in two branches close to 

 the ganglion) ; o, nerve for the ovigerous leg ; c , commissures between the 

 first and second thoracic gangha. 



