342 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 19, 



ScuTELLiNA ROTUNDA, Galeotti, sp. PI. VIII. fig. 5, a, b, c. 



This is Nucleolites rotundus of Galeotti. It is a species of ^cu- 

 tellina and approaches very nearly to S. placentula of the Parisian 

 tertiaries. 



Lenita patelloides, Galeotti, sp. PI. VIII. fig. 6, a, b, c. 



This is Nucleolites patelloides of Galeotti. Sir Charles Lyell re- 

 ceived it from Capt. Le Hon as the Lenita patellaris of Goldfuss, but 

 it diifers from that species in having its vent placed very near to the 

 margin, and in being more convex. In the group of sea-urchins to 

 which it belongs, the position of the vent is very constant, and affords 

 a certain indication of specific character. I regard it as a truly good 

 species : it will stand as Lenita patelloides. 



Spatangus Omalii, Galeotti. PI. VIII. fig. 7, a, b. 



The Spatangus Omalii of Galeotti is allied to the Spatangus 

 Hoffmanni of Goldfuss. Galeotti represents a very bad and worn 

 specimen, and omits the few large and scattered areolae with their 

 included primary tubercles that ornament the antero-lateral and 

 lateral inter-ambulacral areas. The mouth is placed very far from 

 the margin, and the anal extremity is abruptly truncated. It appears 

 to be identical with fragments of a Spatangus found in the Barton 

 beds by Mr. Erederic Edwards. The following revised description 

 of this species may be serviceable : — 



Test cordate, depressed ; anterior fiirrow strongly marked and sub- 

 carinated at its sides. Ventral extremity abruptly truncated, with 

 the anus placed moderately high up. Back slightly carinate. Dorsal 

 ambulacra ovate ; pores connected by wide sulcations. Antero-laterals 

 widely diverging ; postero-laterals meeting at an acute angle. Num- 

 ber of pairs of pores in a row, about 12 in the former and 14 in the 

 latter. Areolae very deeply impressed. Primaries confined to ante- 

 rior and middle portions of test, A group of primary tubercles on 

 each side of caudal projection. Mouth rather far from anteal margin. 

 Ventral surface very flat. 



[3.] Fossiliferous Brussels Sands with calcareous concretions. 

 (III. «, Table XII. p. 334. Part of E 2, Table I. p. 279.) 



Next to the Nummulites IcEvigatus bed we find, in the descending 

 order, white sands which are in some places so calcareous as to have 

 been burnt for lime in the suburbs of Brussels and at Dieghem, where 

 I saw several kilns. These beds usually contain nodules of sandstone 

 in layers, with casts of shells ; sometimes the shell itself is present, 

 either silicified, or, if it retain its calcareous matter, so decomposed 

 as to fall to pieces when touched. 



(1.) Rouge Cloitre, near Auderghem. 

 At Rouge Cloitre, near Auderghem, five miles south-east of Brussels, 

 these calcareous beds, with some shells (silicified or in casts), are found 

 about 4 feet thick, and have afforded the following shells which are 

 in Capt. Le Hon!s cabinet : — 



