64 ART. S. — I. IKEDA. 



Fig. 40. — A small part of the midgut in cross-section. Only one of the 

 epithelial folds is shown. The peritoneal lining (pr.) consists of 

 moderately tall cells in a row. Eelative position of the two mus- 

 cular layers (cm. and I.m.) as in crop. Zeiss, oc. 2 and obj. 

 hom. imm. -JL. 



Fig. 41. — Highly magnified figure of a part of the wall of collateral intes- 

 tine in cross-section. Only one of the folds is shown, Zeiss, oc. 

 2 and obj. hom. imm. ^L. 



Fig, 42. — Part of a longitudinal section through the wall of ventral vessel. 



Zeiss, oc. 2 and obj. hom. imm. 



12* 



Fig. 43, — Left marginal portion of proboscis in cross-section. 6.5 x . 



Fig. 44. — Ventral part of a cross-section through proboscis. On this side 

 the epidermis is ciliated. Zeiss, oc, 2 and obj. hom. imm. J^ 



Fig. 4.'5. — Dorsal part of a cross-section through proboscis. On this side the 

 surface is not ciliated ; numerous unicellular glands (g.gl.) are 

 present seated deeply in siibdermal mesenchyme. Zeiss, oc. 2 and 

 obj. hom. imm. J^- 



Fig. 4G. — A small part of a cross-section through proboscis, showing the 

 relation of the perihfemal cavity (per.c.) to the lateral vessel 

 {I.V.) and also the histology of the region, Zeiss, oc. 2 and obj. 

 hom. imm. J^. 



Fig. 47. — Greatly magnified figure of a part of a cross-section of the median 

 vessel of proboscis. Zeiss, oc. 2 and obj. hom, imm. J^. 



Fig. 48. — Magnified figure showing a number of ciliated funnels (ßi.) si- 

 tuated on the surface of anal gland in Thalassema elegans. 



Fig. 49. — A specimen of Th. elegans dissected to show the internal organs 

 in situ. The body-wall has been cut open along the dorsal median 

 line. Reduced to | natural size. 



