348 Prof. T. R. Jones and Dr. H. B. Holl on tlip. 



Herzo^. Schleswig und Holstein, series 1, part 1, p. 57, pi. tx. 



ligs. 3 a, b, c. 

 Beyrichia tuberculata, Krause, 1877, Zeitschr. d. d. gaol. Ges. vol. xxix. 



p. 30, pi. i. figs. 12 a, b, and var. fig. 13. 

 Beyrichia tuberculata, var. gednnensis, Kiesow, 1884, Schr. naturf. Ges. 



Danzig, new ser. vol. vi. p. 277, pi. iv. tig. 5. 

 Beyrichia tuberculata, Reuter, 1885, Zeitschr. d. d. geol. Ges. vol. xxxvii. 



p. 632, pi. XXV. tigs. 1 A and B [and the varieties tigs. 2-9]. 



B. tuberculata (Kloden) is characterized by the nearly 

 oblong shape and the strong growth of its valves, their well- 

 detined margins, and their three full lobes. The front lobe 

 is sausage-shaped, sometimes single, but usually constricted 

 or cut crosswise, so as to be divided into two unequal lobes. 

 The raidlobe is single, oval, and usually free, but occasionally 

 united by a low and narrow isthmus with the foot of the 

 posterior lobe. The last is the largest, somewhat semilunar 

 orcurvi-pyriform (gigot-shaped), and more or less tripartite, 

 rarely (in some varieties) less strongly sulcate ; but in some 

 cases it is resolved into several isolated tubercles. The sur- 

 face, especially of the large lobes, is coarsely and irregularly 

 granulate, and the margin also is sometimes tuberculate. 



The late Dr. Ernst Boll objected that Kloden should b3 

 the '' authority " for this species, because the latter included 

 all his figures in Battus tuberculatus. As, however, he 

 regarded some as immature forms, the ligs. 21, 22, and 23 still 

 remain as representing the typical species. His ligs. 16 and 

 17 are B. Wilcketisiana, Jones (fig. 16 being var. plicata, 

 not CytlierelUna siliqua, as Krause thinks). Fig. 18 is 

 probably B. Salteriana, Jones, as suggested by Krause ; and 

 lig. 19 may be the B. Bolliana of Reuter, but cannot be B. 

 complicata, as supposed by Boll ; nor (together with fig. 18) 

 does it represent B. Wilchensiana, as supposed by Jones in 

 the Ann. & Mag. Nat. Hist, for August 1855, p. 87. 



Dr. Boll recognized that his B. Kochii, described as being 

 smooth, is like Jones's fig. 5, pi. v., 1855, which, however, is 

 granulatedj and may stand as a weak form of B. tuberculata 

 (Kloden). B. Kochii still more closely agrees with figs. 10 

 and 11 of that plate ; and the latter individuals, so illustrated, 

 might be called B. Kochii, Boll, if the absence of ornament 

 were a specific character in this and the analogous case of B. 

 Kloedeni, var. nuda, Jones (fig. 7, pi. vi., September 1855). 

 So also Dr. Boll was disinclined to include Jones's fig. 12, 

 pi. V. (var. aritiquata), in the species B. tuberculata, the pos- 

 terior (gigot) lobe being weakly developed ; but an analogous 

 varietal form accompanies the typical B. Klosdeni (see pi. vi. 

 Sept. 1855, fig. 8, and Geol. Mag. 1881, p. 345, pi. x. fig. 1 1) ; 



