334 CRETACEOUS ECHINODERMATA. 
widening. Ossicula of avenues 6-grooved. Ossicula of disc tetragonal, Eteae 
those of the rays more or less hexagonal. 
A very flat and compressed species. 
Lower chalk. Washington and Amberley, Sussex. 
Goniaster (Astrogonium) Smithi. (Tab. XXII. fig. 1 & 2.) 
Body pentagonal with produced angles. Marginal plates of each row about 
40 on a side, the central 12 largest, oblong, slightly tumid, abrupt externally, 
punctate. Those of the rays broader with deep and rounded external sides, 
subtuberculated in consequence of having articulations for spines, varying from 
1-3 in number. Ossicula of disc mostly tetragonal, punctated. Ambulacral 
ossicula 3—4-grooved. 
Fig. 2. This is one of the most beautiful and perfect star-fishes that have been 
discovered. It was found in Kent, and forms part of the valuable collection of 
Mrs. Smith of Tonbridge Wells, to whom it is dedicated. Fig. 1 belongs to 
Mr. H. Catt, and from Sussex. Both specimens are from the lower chalk. Mr. 
Dixon and Mr. Coombe have also this star-fish in sulphuret of iron, discovered 
in Amberley pit, Sussex. 
Goniaster (Astrogonium) mosaicus. (Tab. XXIV. fig. 26.) 
Body pentagonal with produced angles. Marginal plates of each row nearly 
50 on a side, 16 of which belong to the body. ‘These are narrow, curved, very 
short above, and minutely punctate ; those of the arms are rather wider. All 
are small in proportion to the breadth of the disc. Ossicles of disc polygonal, 
punctate. 
Lower chalk. In Mr. Bowerbank’s, Mrs. Smith’s, and Mr. Dixon’s cabinets. 
Goniaster (Astrogonium) Coombu. (Tab. XXIII. fig. 6.) 
Body with deeply lunated sides and tapering angles. Marginal ossicles of each 
row above 30 on a side, oblong, slightly convex, coarsely punctate, abrupt at 
the sides, those below rounded ; when perfect covered with minute hexagonal 
granules. Ambulacral ossicula 3-4-grooved. Ossicles of disc polygonal, 
coarsely punctate. 
The marginal ossicles of the arms in this species have very angular sides. 
Lower chalk. This beautiful and rare specimen was found by G. Coombe, 
