76 Dr. T. Wright on Fossil Echinoderms 
surface, the greater elevation of the posterior than the anterior 
half thereof, the inflated ridge-like eminence formed by the 
single interambulacrum, and the well-defined character of the pori- 
ferous avenues, form a group of characters by which E. Kleini 
is distinguished from its congeners. It has many points of 
resemblance in common with E. ovalis; but the greater length 
of the ambulacral areas in this species makes a marked distine- 
tion between them ; moreover, in E. Kleinii the base is concave, 
whilst in E. ovalis it is convex; the latter form is likewise 
flatter and more oval, and its apical disc more excentral than in 
E. Kleinii. 
Stratigraphical position.—Collected at Malta, from bed No. 2, 
where it is very rare. It is found, according to Goldfuss, in the 
Miocene beds at Biinde, Osnabruck, Astrapp, and Merminghiifen, 
in Westphalia. 
History.—Admirably figured and well described by Goldfuss. 
The only Maltese specimen we have seen of this species is that 
collected by the Earl Ducie, which is in his lordship’s museum. 
Echinolampas Deshayesii, Desor, sp. Pl. IV. fig. 3 a-d. 
Syn. Echinolampas Hayesiana, Agassiz and Desor, Cat. raisonné, 
Ann. Sc. Nat. tom. vil. p. 166. 
Test oval, depressed; ambulacral areas narrow; the poriferous 
zones contracted, without apparent connecting transverse sulci ; 
apical disc small and nearly central; base convex; mouth 
and anus large. 
Dimensions. — Antero-posterior diameter 2,4, inches, trans- 
verse diameter 1,2, inch, height ,%,ths of an inch. 
Deseription.—The form, size and structure of the ambulacral 
areas afford the best guide to a knowledge of the numerous species 
of this group. The Urchin before us has an oblong form, de- 
pressed at the dorsal surface, convex at the base, and slightly 
produced posteriorly. The ambulacral areas are narrow at their 
widest part ; they are about one-sixth the width of the postero- 
lateral imterambulacra at the border. The poriferous zones are 
narrow, and extend rather more than half-way down the dorsal 
surface ; the pairs of pores are placed closely together, and the slit 
or sulcus, which in general unites the inner and outer series 
of pores together, is absent in this species, or at all events is not 
apparent in the individuals before us ; the holes of both rows are 
nearly of the same size. The interambulacral areas are wide; 
the antero-lateral are the narrowest ; the single interambulacrum 
is slightly produced in the region of the anal opening. The 
apical disc is small, and situated near the centre of the test, 
