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PROCEEDINGS OF THE NATIONAL MUSEUM 



the penis, then curves ventrally and opens into the roof of the genital 

 antrum. Its lumen enlarges distally; the epithelial lining of the lumen 

 is thrown into villus-like folds. The muscle coat of the bursa stalk is 

 well developed and consists of intermingled longitudinal and circular 

 fibres. The walls of the distal part of the bursa stalk and the genital 

 antrum near the genital pore are supplied with eosinophilous glands. 

 The egg-capsule or the cocoon of this species is not known. 



pb in 



bs cod 



sd be edPP 



Figure 4. — Sagittal view of copulatory apparatus of Dendrocoelopsis hymanae: no. 468a. 



Remarks. — The genus Dendrocoelopsis was described originally by 

 Kenk (1930). Afterward, Kenk (1953) modified the original definition 

 of the genus by omitting the presence of a sucker as a generic char- 

 acter in order to include the species described under Amyadenium de 

 Beauchamp. The taxonomy of Dendrocoelopsis, thus denned, was 

 discussed by Hyman (1935), by Kenk (1953), by Ichikawa and 

 Okugawa (1958), and recently by Dahm (1960). I am in complete 

 accord with their opinions. 



The species described under the genus Dendrocoelopsis (including 

 Amyadenium) are as follows: Dendrocoelopsis spinosipenis (Kenk, 1925; 

 possibly including Digonoporus macroposthia An Der Lan, 1941) from 

 Yugoslavia, Sweden, and Denmark; Dendrocoelopsis vandeli (de 

 Beauchamp, 1931), D. brementi (de Beauchamp, 1919) and D. chattoni 

 (de Beauchamp, 1949) from the Pyrenees; D. garmieri (de Beauchamp, 

 1950) from central France; D. brementi oculatum (Porfirjeva, 1958) 

 from the Caucasus; D. lacteus Ichikawa and Okugawa (1958) and 

 D. ezensis Ichikawa and Okugawa (1958) from North Japan; D. 

 piriformis Kenk (1953) and D. alaskensis Kenk (1953) from Alaska; 

 D. vaginatus Hyman (1935) from Montana and Oregon in North 

 America (Hyman, 1963). 



