400 Prof. T. R. Jones on the 



Some individuals have the hjpertrophied lobe (fig. 9) fre- 

 quently seen in some species of Beyrichia (see Ann. & Mag. 

 Nat. Hist. ser. 5, vol. xvii. pp. 339-343). There are about 

 twelve of these accompanying the others. 



Several years ago I received specimens of Silurian Bey- 

 ricMce found at Frojel and CEstergarn, in Gothland, from Dr. 

 Lindstrom, and amongst them B. clavata occurs, sometimes 

 with the hypertrophied antero-ventral lobe. 



Note. — The figure given of Beyrichia Kloideiii, M'Coy, in 

 the Brit. Pal. Foss. Cambr. Mus. 1851, pi. 1 E. fig. 2, has a 

 considerable resemblance to B. clavata^ Kolm. ; so also has 

 Haswell's figure of B. Kloedeni (Silur. Formation Pentland 

 Hills, 1865, pi. iii. fig. 12). In each case, however, I believe 

 this resemblance is due to the inferior portraiture of the 

 specimen. Having been favoured with an opportunity of 

 studying McCoy's type specimen, I find that it is a fairly 

 good internal cast of an ordinary adult B. Kloedenij with 

 three lobes really having proportions and distances different 

 from those in B. clavata. 



2. Beyrichia Kloedeni^ M'Coy, var. granulata^ Jones. 



Beyrichia Kla'deni, M'Coy, var. (jrumdata, Joues, Auu. & Mag'. Nat. 

 Hist. ser. 5, vol. xvii. 1886, p. .350, pi. xii. tig. 2 ; Silur. Ostrac. Goth- 

 land, 1887, p. 2. 



Of this form, which is a good type of B. Kloedeni^ except 

 that it has a rough instead of a smooth surface, there was 

 only one in the set sent in 1886, and I had one which Prof. 

 Lindstrom gave me some years ago. Both have the hyper- 

 trophied lobe. 



Except in the roughness of the surface and the want of 

 tubercles on the margin these specimens closely match fig. 12 

 of Angelinas unpublished " tab. A." 



Found at CEstergarn and Frojel. 



3. Beyrichia Klcedeni, M'Coy, var. verruculosa^ nov. 



Three specimens among those from Eksta and Frojel are 

 referable to B. Klcedenij but are rather longer (3 millim. in 

 length) than usual^ and have a coarse granulation of some- 

 what scattered tubercles over the surface and on the thick free 

 margins. The lobes are well formed and distinct, the middle 

 lobe slightly united below with the other two. The fig. 13 in 

 Angelin's unpublished " tab. A " is of the same kind, but its 

 features are rather masked by the hypertrophy of its antero- 



