KOFOID AND SWEZY: UNARMORED DINOPLAGELLATA 483 



He then descends to doggerel : 



Was man in Osmium besitzt, 



Kann man bequem naeli Hause tragen ! 



Und wenn man d'ran gezeichnet und geschwitzt, 



Audi manehes Schone d'riiber sagen. 



and erects the deadly parallel column in the form of comparative figures of 

 "Erytlirypsis agilis; nach E. Hertwig" and " Spastostyla sertulariarun; nach 

 Geza Entz." 



Tlie impartial observer's estimate of the fairness of the critic's attack nnist 

 be influenced by the fact that the figure of Eri/thropsis agilis which Yogt states 

 is "nach R. Hertwig" is not a reproduction of any of Hertwig 's (1884) figures, 

 but is a highly modified combination of Hertwdg's figures 2 and 8. The modi- 

 fications are: (1) the elongation, curvature, and narrowing down of the nucleus 

 in the direction of the vorticellid t^^ie of nucleus; (2) the change of the con- 

 tinuous spiral (as Hertwig had drawn it) into an adoral zone of separated 

 membranelles, as a sheath containing a fibrillar axis as in Vortieella instead 

 of a homogeneous solid cylinder as distinctly figured by Hertwig. 



With this deadly parallel before his readers, Vogt proceeds to demonstrate 

 that, pfirt for part, Hertwig's Erj/fhropsis is nothing but a Yorticdln, its ten- 

 tacle being the stalk of the ciliate while the eye is that of a medusa lodged in 

 the gullet of the Vortieella fixed at the instant of swallowing. To add poignancy 

 to the thrusts of his criticisms he further ilhuuinates the enormity of the error 

 by publishing "nach den Briidern Hertwig" figures of the ocelli of Lizzia and 

 Naimtlioe, whose similarity to the pigment spot and lens of Eri/tliropsis, as 

 Vogt figures them, is little less than damning. 



Tn extenuation of Vogt's conclusions it is to ])e noted that the dimensions, 

 which may be approximated from the recorded systems of objectives and oculars 

 used in making the figures of ErijtJiropsis, and the ocellus of Lizzia, are such 

 that such a combination of eyespot and Yoiiiedla is spatially possible, and 

 furthermore that Hertwig's figures (1878, pi. 8, figs. 9, 10) of the ocellus of 

 Lizzia and tliat of the lens and pigment mass of Erytliropsis have much in 

 common in appearance, though structurally entirely different, as Hertwig 

 (1885) had shown. Hertwig's figure (188-1, pi. 6, fig. 7) of the pigment ar- 

 ranged in striate radial fragments about the lens of Erijthropsis as shown in 

 side view is remotely like his figure of the ocellus of Lizzia (1878, pi. 8, fig. 9) 

 in face view with radially arranged striate pigment masses encircling the lens. 

 It should also be noted that Hertwig (1884) compares the tentacle witli the 

 stalk of Vortieella in that it is homogeneous, and lias a fine cuticula. 



In treating of Hertwig's reply and reaffirmation that there are no cilia 

 upon Erytliropsis, Vogt (1885?>) merely condemns the certainty of the r(>af- 

 firmation and compares it with the cautious statement regarding cilia not having 

 been observed, in the ]u-eviously ]>ul)lislied account. l.'[o coucludos that the 



