REMARKABLE SPECTER OF ECHTUROIDS. C)?y 



jieritioneiira pr. and the inner epithelium ept,), there exists a 

 connective-tissue layer comprising the internal longitudinal {l.m.) 

 and the external oblique muscles (o.m.). Zeiss, oc. 2 and obj. 

 horn. imm. J^- 



Fig. '.V2. — Part of pharyngeal wall and of muscular Literal mesentery (lu.in). 

 in transverse section. Circular folds of the mucous membrane 

 (m.m.) and the muscular arrangement are well seen. About 40 x . 



Fig. n.'». — Small part of the pharyngeal mucous membrane greatly magnified. 

 Unicellular glands {(/I.) are interposed between strongly compressed 

 epithelial cells (cjit.). Zeiss, oc. 2 and obj. hom. imm. J^. 



Fig. .'^)4. — Highly magnified figure showing the structure of the trabecular 

 layer in the pharyngeal wall ; taken from a cross-section. In the 

 lacunar spaces (Ls.) are contained amoeboid cells (iv.c). Zeiss, 

 oc. 2 and obj. hom. imm. J^. 



Fig. .')."). — Cross-section of the anterior portion of oesophagus with the typli- 

 losole-like ridge (ts.). wjn. (misprinted v.m. in the plate) in this 

 figure indicates the posterior continuation of the right lateral 

 mesentery. 56 ■>< . 



Fig. 3G. — Showing the histological structure of the typhlosole-like ridge of 

 œsophagus. Zeiss, oc. 2 and obj. hom. imm. j-i . 



Plate IV. 



(Figs. 37-47, Thcdassema tœnioîdes. Figs. 48 and 49, 

 Thalassema elegans). 



Fig. 37. — Cross-section of the crop and of the ventral mesentery {v.m.), on 

 which a gland-like structure {cjl.s.) is developed. About 40 x . 



Fig. 38. — Part of the crop- wall in cross-section. The villi-like prominences 

 of the mucous membrane are seen to be composed of a syncytial 

 mass of protoplasm. Peritoneum {pr.), peculiarly modified, con- 

 sisting of tall cells. Longitudinal and circular muscle layers in 

 reversed order against same in pharynx and œsophagus. Zeiss, 

 oc. 2 and obj. hom. imm. ^2- 



Fig. 39. — Part of a cross-section through the gland-like structure of the 

 ventral mesentery. Above, two side-folds of the mesentery proper 

 (A,B). a {p'.) and h {pr.) indicate two forms of the peritoneal 

 cells, h.c, cœlomic corpuscles, probably derived from the peritoneal 

 cells. Zeiss, oc. 2 and obj. hom. imm.J^- 



