KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 63. NIO 2. 33 



General Distribution. 



This variety of the species C. rhizopus has been reported from the Murman 

 Biological Station. Tbree specimens have been dredged at three different localities. 

 Bottom, sand and shells. Depth, 28—90,5 m, (Cf. Redikorzew 1911.) 



Remarks. 



It appears most probable that the specimens described under the name of 

 Cnemidocarpa rhizopus var. murmanensis may represent young ones of G. rhizopus. 

 As the material at my disposal is not ample enough to make out the question, the 

 variety is provisionally maintained. 



Two of the specimens of the Riksmuseum collection dredged in Kära Sea seem 

 to agree, as to principal features, with the form described under the above-mentioned 

 name. Hovvever, I will point out that the opening of the dorsal tubercle is directed 

 to the left. The reproductive organs consist of many gonads on each side; the 

 gonads are of the same structure as those of the other Cnemidocarpae: the testis 

 and the ovary are not separated. Judging from the figures (1911, p. 62), the in- 

 dividuals reported by Redikorzew do not show any difference with regard to the 

 above-mentioned organs. The above-mentioned author, however, has described them 

 as follows: »Das Flimmerorgan ist ungemein gross, kreisförmig; die Öffnung nach 

 rechts gewandt; — ». »— die Ovarien sind schlauchförmig, je 5 auf jeder Seite; die 

 drei oberen Schläuche sind sehr nahe an einander gestelit, die zwei unteren etwas 

 lockerer und unter einem gewissen Winkel zu den ersteren. Beide unteren Ovarien 

 rechts und links sind allseitig mit zahlreichen Hodenbläschen umgeben. » In the 

 description of the variety the above-mentioned author seems thus to have made the 

 same mistakes as in that of the species (cf. p. 32). 



The third specimen dredged in Kära Sea has been referred, with some he- 

 sitation, to Cnemidocarpa rhizopus var. murmanensis. No complete description can 

 be made from the individuaal in question, only the following notes, from which one 

 might conclude that it is a form nearly related to G. rhizopus. The specimen is a 

 young one. The body is elongated, cylindrical and covered with sand grains. The 

 a pertures are easily detected and situated near together on small elevations. At 

 the posterior end the test tapers abruptly into a long root-like stalk. (Pl. 1, fig. 21.) 

 Length, baso-apical, 4 mm, breadth, dorso-ventral, 2 mm. 



With regard to the internal structure it should be noticed that the dorsal 

 lamina is plain-edged, transversally folded — what might possibly depend on contrac- 

 tion of the tissues. The opening of the dorsal tubercle is C-shaped; the open in- 

 terval is turned to the left. The stomach is short, with longitudinal folds in its 

 wall. The margin of the anus has about 15 lobes. The folds of the branchial 

 sac are in a rudimentary state. In the individual in question they are more re- 

 duced than in any other known Cnemidocarpa. They are substituted by longitudinal 

 vessels which are distributed as follows: 



K. Sv. Vet. Akad. Handl. Band 63. N:o 2. 5 



