BY VERA A. IRWIX-SMrrH. 813 



4. Barrois, J., et A. Giard. — "Note siir un Ch;etosoma et une Sagitta." 



Rev. So. Nat., T. iii., 187o. 



5. Panx'Eri, p. — "Osservazioiii iiitorno a nuove forme di Neniatodi 



maiini." Atti Accad. Sn. fis. mat. di Napoli, Vol. vii., 1878. 



6. Levinsen, J. — "Smaa Bidiag til den gronlandske Fauna." Videnskab. 



Meddel. naturk. Foien., Kjobenhavn, 1881. 



7. ScHEPOTiEFF, A. — "Zur Systematik del' Nematoideen. "' Zool. Anzeiger, 



Bd. xxxi., 1907. 



8. "Die Chaitosomatiden. (Untersuchungen iibereinige 



wenig bekannte freilebende Nematoden. iii.)."' Zool. Jahrb., Bd. 

 26, 1908. 



9. Southern*, R. — " Nemathelmia, Kinorhyncha, and Cha;tognatha." 



Proc. Roy. Irish Acad., Vol.31. Clare Island Survey, Pt.54, 1914. 



10. Schepotieff, a. — ''Ehahdoijaster cyjiioide-s Metschn."' Zool. Jahrb., 



Bd. 26, 1908. 



11. Bastian, H. C. — "Monograph on the Aw/ui/Zn/iddov free Nematoids." 



Trans. Linn. Soc. London, Vol. xxv., 1865. 



12. Man, J. G. de. — Anatomische Untersuchungen iiber freilebende 



Nordsee-Nematoden. Leipzig, 1886. 



EXPLANATION OF PLATES XLIV.-L. 



Befereace fetters. — a., Anus — a.o., Swollen anterior end of resophagus in 

 head — «. or.. Anterior ovary — a. ph., Anterior pharyngeal bulb — h., Banded 

 area on head — h.77i. , Block-masses of granular tissue below ventral seta; — c.s. , 

 Compound seta of outer row of ventral seta; — coe^.,C<Telome — cm^. Cuticle — 

 rf.,'*., Dorsal locomotor seta; — c?.w./>., Dorsal, longitudinal, mesodermal band 

 — e.h., End-hairs — 9 , ff.p., Female genital aperture — f/L, Glands lying 

 above pharynx — hd., Head — h.h.. Head-hairs — int., Intestine -/./*., Inner 

 roAv of ventral setae — i.r'.. Second inner row of ventral set* — Lo., Lateral 

 sense-organ — vi.. Mouth — nk, Neck — n.o.. Swollen anterior end of (eso- 

 phagus in neck — o.r.. Outer row of ventral sette — a\, (Esophagus — ph., 

 Pharynx — p. or.. Posterior ovary — p.r.. Postanal portion of outer row of 

 ventral setai — p. ph., Posterior pharyngeal bulb — p.^., Penial sette — r.. 

 Rostrum — re. Rectum — -s-., Simple setag in front of inner rows of ventral 

 seta; — s.c. Subcuticular layer of body-wall — s.s.. Simple seta of outer row 

 of ventral setse — sp., Sperms in uterus — t.. Testes — t.h.. Trunk-hairs — 

 t.li'.. Short trunk-hairs between the long hairs tL, Tail — t.tj., Tail-gland — 

 ut., Uterus — r.//t. 6., Ventral, longitudinal, mesodermal band — r.^-., Vesicula 

 seminalis. 



Plate xliv. — Chfvtosoma falcatum, sp.n., 6 . 

 Fig. 1 ;— Side-view of a whole mount, ( x 240), with the cuticle drawn in (nit- 

 line onlj^, in order to show the position of the internal organs, the 

 structure of which is only faintly discernible through the thick 

 bodj'-wall. 



