ROTATORIA 161 



S. pcctiiiata Ehrenberg, K 8, K 19, K 21, K 21a, K 26, K 43, K 46, K 48 ( 1) vc, K 51 c, N 5. 



5". stylata Wierzejski, K 43 c, N 5. 



S. tazina Hood, K 43, ? L 72. 



S. tremida (Muller), P2 (6, 7), K 43 c, K51, ? N 19. 



5-. sp., K 35, L 14. 



Tcstudinclla incisa (Ternetz), N 2, N 8, N 13. 



T. viucronata (Gosse), K 35. 



T. patina (Hermann), P2 (6, 7), P 3, K 8, f. patina and f. intcnncdiata Anderson, K 19, 



K 21, K 24, f. intcnncdia, K 35 c, K 51. 

 Trichocerca cristafa Harring, P2 (7). 

 T. cylindrica (Imhof), K 43. 



T. elongata (Gosse), K 8, K21, K21a, K 26, K51. 

 T. iernis (Gosse), K 8. 



T. longiscta (Schrank), K 19, K 35, L 14, L 16, L 72. 

 r. rattus (Muller), P 2 (6, 7) c, P 3, K 8, K 21, K 35, K 69, L 14, L 16. 

 T. scipio (Gosse), P2 (7). 



Trichotria pocilliim (Muller), K 19, K 21, K 51, L 14, L 16, L 72, L 73. 

 T. tctractis (Ehreberg), P2 (7), K 8, K 19, K21, K 21a, K 46, L 72a, L 73, N 5, N 8. 



IV. TAXONOMIC AND ZOOGEOGRAPHICAL NOTES 



1. Ct'plialodcUa catcUina ( Muller ).■* Several allies of this species, distinguished pri- 

 marily by the relative length and shape of the toes, appear to exist. There can be little doubt 

 that the form figured by Ehrenberg, who gives the first recognisable illustration of the species 

 (1838, T. LV, fig. iii) is the same as that figured ^by Hudson and Gosse (1889, Plate 

 XIX, fig. 10a) and by Harring and Myers (1924, Plate XXVII, fig. 3). If Ehrenberg's 

 reference of his Diglcna catclUna to Ccrcaria catcUina Miiller determines the significance of 

 the latter, which otherwise would be quite unrecognisable, it is clear that the form of the 

 species with long slender straight toes about one-sixth of the tutal length must be regarded 

 as typical. 



On the other hand Weber has figured, as Diglcna catellitia a form which is not only 

 somewhat larger than the typical form as figured by Harring and Myers, Init has a propor- 

 tionately shorter and basally much broader toe. Though this form is perhaps less widespread 

 than the true C. catcUina, it apparently is found in the New World as well as in the Old, 

 for Mr. Myers informs us (in Hit.) "after our paper was published, . . . Harring found l)oth 

 forms of C. catcUina and it was at that time decided that we should have described both." 



' After the present paper had gone to press, we saw, through the kindness of Mr. Myers, part of the proof of 

 a paper by Dr. Wiszniewski, in which this species is discussed. Dr. Wiszniewski has shown that calclVina Weber 

 differs from catcUina Harring and Myers, not only in sh:ipe and in the form of the toe, but in possessing salivary 

 glands. These structures appear to be present in our volvocicolous form and absent in f. ahlstroini. We have 

 attempted, with a minimum alteration of our text, to bring our arrangement into line with that of Dr. Wiszniewski. 

 We find it impossible, however, to agree with him that the true catcUina is the species figured by Weber, but 

 have much pleasure in associating the name of this distinguished Polish investigator with such an interesting 

 species. Were it not for the fact that catellina is the genitype of Cephalodella, it would probably be better to dis- 

 card the name and use for the form figured by Harring and Myers, the new name introduced by Dr. Wiszniewski. 

 The posterior position of the foot in Miiller's figure makes it certain that whatever species he may have had 

 before him, it was not either of the present forms. 



