60 CALYPTK^DiE. 



intervals, seems to differ from those with thick rounded ribs 

 near together, and the conical forms may seem distinct frorn 

 the flattened ones, but in a number of specimens they are 

 found to merge into each other. 



2. AURicuLATUM, f. 7-14, Cheinnitz. — Subspiratum, varie 

 radiatim et concentrice pictum, fere Iseve, vel spinoso-cos- 

 tatum, costis et spinis oblique radiatis ; spinis brevissimis vel 

 elongatis ; calyce magno, ovato. — The spines or spinous ribs, as 

 well as the markings, differ much in different varieties, but 

 agree as to their oblique, semispiral direction. 



3. LiGNARiUM, f. 15-23, Broderip. — Oblique conicum, 

 elevatum, (variat magis depressum aut lateraliter distortum) 

 radiatim plus minusve striatum aut liratum ; apice acuto 

 valde retrorso ; pallide fulva, aut grisea, castaneo radiata, aut 

 acute maculata, nonnunquam lignaria calyce ovato, lateraliter 

 annexo. — Figures 15, 16 represent the most extreme forms, 

 and both are included in Mr. Broderip's plates. C. trigonale 

 of Adams and Eeeve, our f. 21, 22, show a strong afiSnity 

 to them, while in its turn C. spectrum, Eeeve, cannot be 

 separated ; and the box-wood- coloured deformity, f. 23, 

 brings us back to lignaria, f. 15. 



4. TENUE, f. 24, 27, 28, 30, Broderip. — Tenue subdepres- 

 sum sublsevigatum, fulvo vel castaneo radiatum, apice sub- 

 centrali ; calyce ovato, lateraliter adnato. — Much smoother 

 and thinner than the preceding, with a central or nearly 

 central apex. 



5. SEEKATUM, p. 25, 26, Broderi'p. — Depressum costatum 

 castaneo uniradiatum, apice subcentrali obtuso, costis sub- 

 distantibus, interstitiis concentrice foveolatis, calyce angu- 

 lato lateribus duobus liberis. — A small flat species, with 

 rather serrated ribs and pitted interstices. The cup is 

 triangular, and has two free sides, the third side forming part 

 of the wall. 



6. CONCAMEEATUM, f. 29, Rcevc. — Oblique ovato-conicum, 

 fulvum, valide costatum, interstitiis foveolatis ; apice acu- 

 tissimo oblique arcuato ; calyce trigono lateribus duobus 

 liberis. — In the form of the cup and the sculpture this 

 resembles G. serratura, but the apex is elevated, and has a 

 strong semilateral curve. 



