D. BRYCE ON MACR0TRACHEL0U8 CALLIDIN^. 443 



lidinse, lost sight of until recent years. In 1891 Zelinka ^ men- 

 tions that he had met with it, and remarks that it is not exclusively 

 alpine. More lately Janson^ (p. 29), commenting upon the in- 

 sufficiency of Ehrenberg's descriptions of Callidinae, quotes that of 

 C. alpiiim, and declares that **if we omit the 'ventre transverse 

 plicato,' which apparently is in this sense incorrect, and occurs in 

 no Callidina, this description fits all the hitherto described Calli- 

 dinag with two teeth, and these are nine in number. " It is clear," 

 he proceeds, *' that a description thus common is worth none at 

 all. Call, alpium has, therefore, been found by no later observer, 

 and since Ehrenberg not again described." Janson has obviously 

 overlooked Zelinka's identification of the species, but apart from 

 this, he is mistaken in assuming that the character of ventral 

 transverse folds, so emphasized by Ehrenberg, is incorrect. I 

 have found it in two species, one of which, however, difi'ers from 

 the other characters given by Ehrenberg in having a tooth formula 

 |, and in not being transparent. The other form, however, is 

 fairly so, and has the tooth formula f. In it the transverse ventral 

 folds are conspicuous both when the animal is contracted and when 

 it is extended. I have, therefore, little hesitation in assigning 

 this form to Ehrenberg's species, and in this case I substitute for 

 the original specific diagnosis one based upon the specimens I 

 have myself examined, with the fuller details required by the 

 greater knowledge of to-day. 



In only one particular is there, I think, a discrepancy. My 

 examples were barely -^^ inch, or one-third the length given by 

 Ehrenberg. Inasmuch, however, as all the eight species of 

 Callidina described by him were either -g- or -J- line, it is sug- 

 gested that he employed at the time no very exact means of 

 measurement, and therefore I attach little importance to the point. 

 The species is of robust habit, slow and deliberate in its move- 

 ments. The ample discs are separated by a wide sulcus. In 

 direct dorsal view, the upper lip is somewhat concave, without 

 lobes or hillocks, but the edge is usually finely toothed centrally, 

 more coarsely laterally, the teeth appearing to be simply of fleshy 

 character. While feeding the neck is unusually shortened by 

 partial retraction. The skin, always clean, is rough, finely stippled, 

 and rather stiff. A peculiar conformation of the anterior margin 

 of that portion covering the first central segment is very distinctive. 

 When the creature is extended or feeding this margin is seen to 



JouRN. Q. M. C, Series II., No. 35. 31 



