26 



junguntur, sed spatium intermedium relinquunt. Additamenta ad Klei- 

 nii dispositionem Echinodermatum." P. 196. This fossil, which was 

 in the collection of Lord Bute, is, I suspect, from Verona. 



The second family of this section is the Lagana of Klein. The 

 species Echinodiscus Laganum, or pancake of Leske, includes, on ac- 

 count of their similarity, the first and third species of Klein, and are 

 exemplified in Klein's Plate xxn. a. b. c. The specimen which is here 

 figured, Plate III. Fig. 10, may be considered perhaps as only a variety 

 of this species. The shell is white, and of a form between the oval and 

 pentagonal. The mouth is central, and an obtuse pentagon ; the anus 

 is small and round, and nearly midway between the mouth and the 

 margin. Five slightly hollowed lines, proceeding from the mouth, di- 

 vide the under part of the shell into five nearly equal areas, by coin- 

 ciding with the centre of the terminations of the ambulacra. These 

 are ten, biporous and undulating; and form, on the upper surface, five 

 pentaphyloidal figures, expanding at their extremities. This species is 

 not noticed by Linnaeus. 



Echinodiscus subrotundus, Tab. XLVII. Fig. 7, Lesk.; Scilla, Tab. vm. 

 Fig. 1 3. Leske, who had never seen this fossil, has copied his figure 

 from that of Andrsea, in Lift. Helvet. Tab. v. Fig. g. But the figures 

 of Scilla and of Andraea do not, as Leske supposes, agree. In that of 

 Andrea the edge is acute, and somewhat undulating ; whereas, in that 

 of Scilla, the margin is obtuse, and nearly circular. The fossil figured 

 Plate III. Fig. 2, from Italy, agrees with the former, in its edge being 

 undulating. 



This fossil is very nearly circular. Its upper surface is convex. The 

 base is flat, with five narrow and slightly excavated grooves, extending 

 in right lines, and at nearly equal distances, to the margin. The mouth 

 is rather injured, so that its shape cannot be determined. The anus is 

 small and round, and is placed at about a fifth of the diameter* from the 

 margin, in an area which is rather smaller than the others. The ambu- 

 lacra /appear to have borne the figures of oval petals; and are* each, 



