498 



THE AMERICAN NATURALIST [Vol. XL 



Comptonia incisa Ludwig, Palceont., vol. 8, p. 96, pi. 30, fig. 7-15, I860. 



Heer, FL Foss. ArcL, vol. 2, p. 474, pi. 39, fig. 7, 1871 (referred to 



Dryandra acutiloba (Brongn.) Ettings). 



Schimp., loc. cit., p. 561. 

 Comptonia triangulata AVatolct, PL Fo.<^. Bass. Paris, p. 124, pi. 33, 



fig. 4, 1866. 



Myrica credneri Engelh.. X^m A.i. L,,,,,. Carol., vol. 39, p. 376, pi. 23. 

 fig. 13, 1877. 



Myrica {Comptonia) tschcrnoivitziana Eiigelh., Ibid., p. 375, pi. 23, fig. 

 Comptoniphyllum japonicu m ^ath., Pal. Abh. D. & K., vol. 4, pp. 207, 



This species embraces leaves approaching the acutiloba type,, 

 averaging, however, considerably larger in size. They are similar 

 to Comptonia drijandroides Ung. except that the lobes in the latter 

 species are fewer in number and more falcate in outline. As will 

 be seen from the foregoing synonymy I have included a variety 

 of names under this species, most of them having been based upon 

 fragmentary material. Some of these may be entitled to varietal 

 rank, but surely their slight differences do not entitle them to rank 

 as valid species. For instance, Engelhardt's tschernowitziana is 

 based upon a single specimen showing but three lobes on one side 

 and one loi)e on tlic other .si<le. It differs from t!ie ty])i('al (jaudinii 



be a larger leaf of tlit- -aiiic author's crnhim. both of which 1 iiichi(h- 



which c..m-p..nd uirh hrlr run.rit'.iana mull Uv .vWu.l uithoiit 



a> wa. aUo the Arctic form which h.' refer, to Drjndra arntllnlni. 

 but which seems to belong here. His c.mpariMMi of ijandiiiii t.> 

 dryaiidroides Ung. is certainly siu'niHcaiit. Watclct's f riant/ idnfa 

 is another fragment showing only three conij)lete lolx-s on eacii side. 

 Schimper includes it under Watelef'> mnci.sn from u liicli it inaiii- 

 fe-stly differs, however. NathorM'> ja p<,n i<->n,i shows ..nly the ceii- 



e.xpected when dealing with fiMumeiit-.. the various authors com- 

 pare their .specimens with a variety of other species, for instance 

 Engelhardt compares rndinri with marroloha of We.s.sel & Weber, 

 to which 1 fail to detect any reseinhlat.ee. 



