4.SS TAGR SKOGSBERO 



ill form. Length Vis inch (= 1,7 mm.)". Only one figure, that of the shell seen from the side, 

 accompanies this general and incomplete description, from which it is only clear that a form 

 belonging to the family Asteropidae was before the writer. This figure shows an oviform shell 

 with its greatest height somewhat behind the middle and the posterior part of the shell compara- 

 tively slightly larger than the anterior part; the proportion of the length to the height is 

 1.54 : 1; the dorsal and ventral margins are evenly curved, the former distinctly more boldly 

 than the latter. 



These facts obtained from the original description antl figure seem to show with all 

 desirable clearness that Professor CI. S. Brady's identification of the specimen on which the 

 species I have described is based as A. teres (A. M. Norman) cannot be considered as having 

 sufficient proof to support it. 



Although this species of A. M. NORMAN's is based only on an incomplete investigation 

 of an empty shell, subsec^uent writers have nevertheless succeeded in identifying with it not 

 onlv forms that they have investigated themselves, but also forms incompletely described bv 

 other authors and obviously not re-examined by themselves. Thus G. S. BPvADY and A. M. 

 Norman in their work of 1896 include this species and give the following forms as synonyms 

 of it: Cylindrolehereis teres, G. S. Bp.ad v, 1867 and 1868 a and b, ? Asterope oblonga, C. Claus, 1876 

 and CyUndroleheris teres. G. W. MCller, 1894. — G. W. MtiLLER also includes this species of 

 Norman's in ,,D as T i e r r e i c h"; as synonyms of it are given: ? Bradycinetus teres, A. M. 

 Norman, 1867, Asterope oblonga and A. ovalis, C. Claus, 1876, Copechaete armoricana + C. fissa, 

 E. Hesse. 1878, CyUndroleheris teres. G. W. Miller, 1894 and ? Asterope ocniata, G. S. Brahy, 

 1902 a. — 



As far as one can see these investigators have followed the princijole of combining into 

 one species all forms of the genus Asterope which are characterized by having the posterior part 

 of the shell dominating more or less strongly over the anterior part. It seems certain that 

 this method of procedure can scarcely be considered justifiable and that it can only be explained 

 as due to these writers' deficiency of knowledge of these forms. A study of the species of this 

 genus that are dealt with in this treatise will show this quite clearly. Compare, for instance, 

 A. Millleri var. longiseta, A. Ohlini and A. curt a with the species dealt with above. These species 

 clearly show that forms quite obviously distinct from one another with regard to the limbs, etc. 

 may, all the same, show a striking resemblance with regard to the shape of the shell; i. e. that 

 in this range of forms the shape of the shell alone cannot be considered sufficient to characterize 

 a species. 



It seems best, in order to avoid further confusion, to delete A. teres altogether from the 

 list of identifiable species, at least for the present. Only if a careful study of the Ostrocod fauna 

 at the type-locality, Oban, Firth of Lome, Scotland, were to prove that only a single species 

 is found here with about the same type of shell as these forms would it be proper, to adopt this 

 s])ecies name of NOR.\L\N's again. 



The form described by G. S. BRADY 1868 b, p. 465, under the name of CyUndroleheris 

 teres (NoRMAN) shows a very striking resemblance to the species described by me above with 

 regard to the shape of its shell. — On the other hand the resemblance to the species of 



