APPENDIX TO DECADE V. 



By S. p. Woodward, Esq., British Museum. 



The Appendix contains descriptions of species referred to in the 2nd edit. Morris's 

 Catalogue, for description in this Decade. To these one or two new species of the 

 same genera are added, as also some additional species intended to be supplementary 

 to descriptions in former Decades. 



Genus Cyphosoma, Ag. — Phymosoma (D'Arcli.), Desor. 



1. C. Konigi, Mantell (1822), Geol. Sussex, p. 189. Cidarites variolar is ^ 

 Goldf., t. 40, f. 9 (not Brongn.) Cyphosoma ornatissimum (Ag.), Morris's 

 Cat., 2nd ed., p. 75. C. variolare, Forbes, in Dixon, Fossils, p. x. 

 pi. 25, f. 29. C. Milleri (Desm.), Forbes, in Dixon, p. 340, pi. 25, f. 26, 

 27. Phymosoma Koenigii, Desor, Synopsis, p. 86. 



This species varies in diameter from less than an inch to two inches ; 

 small examples are rare. The spines are short, straight, and round, con- 

 tracting suddenly, and sometimes bent and angular near the point. Long 

 spatulate spines also occur, associated with the normal test. 



Mr. Bowerbank's cabinet contains a remarkable monstrosity of this 

 species, which is inversely conical, like Diadema tumidum. It is 

 9 lines high, and 16 lines in diameter above, contracting below 

 down to the oral opening, which appears at first to be the summit. 

 Locality. — Upper Chalk, Kent, Sussex, x>[orfolk, Wiltshire, York- 

 shire. 



2. C. granulosum (Cidarites), Goldf., Petr. t. 40, f. 7. Desor, Syn. 

 p. 87. Probably only a variety of the preceding species. 



The primary tubercles are larger and more prominent ; the accessory 

 tubercles are quite wanting in young specimens, and but slightly developed 

 in the largest examples, which nearly equal the C. Kcenigi in size. The 

 base is flat, or slightly convex from the peristome outwards. 



Locality. — Most abundant in the Lower Cblalk of Kent and Sussex. 



3. C. spatuliferum, Forbes (1850), in Dixon's Geology of Sussex, p. 340, 

 pi. 24, f. 21. (Coll. Mrs. Smith, of Tunbridge Wells.) Cyphosoma sp. 

 (junior), Dixon, Sussex, tab. 24, f. 28-31. 



Body small, circular, and rough with numerous small prominent 

 tubercles ; lat. 10, alt. 4 lines ; areolae plain above, radiated below ; base 

 concave, mouth small, lat. 4 lines, apical opening pentagonal, irregular; 

 pores in single file ; ambulacral segments prominent, tubercles 8-10, largest 

 at the circumference, with nearly confluent areola ; interambulacral 



[v.] 



