4 g 2 AULISCUS. 



GENUS 1M.-AULISCUS (EHR.) Bailey emend., 1854. 



Frustule cylindrical 

 or discoid. Valve with 

 rays either plumose 

 plaits or with granules 

 arranged round two 

 mastoid processes (or 

 ocelli), rarely obscure, 

 sometimes with a sub- 

 quadrate central portion 



a. b. 



Fig. 215. Auliscus sculptus. 

 a. Girdle view. />. Valve view. 



or with a radiant cellulation interrupted by a linear series terminating 

 in the ocelli. 



The beautiful genus Auliscus comprises about 100 species, among which 

 A. sculptus figured in the text (fig. 215) is the only form hitherto found on our 

 coasts, but to this should be added var. coelata (A. ccelatus Bail.), which 

 certainly belong to us, as I have in my possession specimens from different 

 localities. Lastly, I have to record A. punctatus Bail, which I discovered on 

 the mud of the Scheldt at Antwerp, but until further specimens have been 

 found, I shall consider this one as having been accidentally brought by a 

 vessel. The specimen found belonged to the var. Carpentaria. 



ANALYSIS OF FORMS. 



f Valve divided into four f The plicee of each compartment robust and similar A. sculptus. 



j compartments by two | 



series of plicae placed -J The plicee of compartments with ocelli robust, 

 ; at a right angle. entire ; those of the intermediate compartments 



">, ^ delicate, and resolving into fine granules . var. coelata. 



delicate, and resolving into fine granules 

 Valve without any distinct compartments, plicae very delicate, regularly 



k. radiating and bearing coarse distant granules 



. A. punctatus. 



A, SCulptUS (W. Sm.) Ralfs. (in Pritch. Inf., p. 845, pi. 4, 



f. 3; Eupodiscus sculptus IV. Sm.; H.V.H. Atl., pi. 117, f. 1 & 2*; Type 

 No. 507), plate 21, fig. 646. 



Valve suborbicular, marked at the margin with radiating plicae and leaving 

 in the centre a quadrilobal space. In this space arise four other series of 

 plicae, of which the two bearing the ocelli radiate from them towards the 

 centre of the valve, while the two others radiate from the centre towards the 

 margin of the valve. Length of the valve, 4 to 9*5 c.d.m. 



Marine. Antwerp (Scheldt). Blankenberghe (H.V.H. ), Bed of a dam (Potter's clay (fossil) at 

 Bruges (Deby), Holland (H.V.H. , Suringar), England (W. Sm. ! Gregory! W. Arnott, Kitton, 

 Norman, etc.), Ireland (O'Meara.). 



var. coelata (A. ccelatus Bail.). See the description in the analytica 

 table above. 



Antwerp (Scheldt), Blankenberghe (H.V.H.) 



