38 DESCRIPTION OF A NEW SPECIES OF rOS«?IL LORICELLA, 



recognised. While it is evident that these southern seas 

 were exceptionally rich in species belonging to these two 

 genera at the time the Table Cape Beds were laid down, 

 recent research indicates that both genera are better re- 

 presented by living forms than was thought to be the case 

 when Mr. Hull's paper was written. 



Loricella scnlpta, n.sp. 



Up to the present one median valve only has been dis- 

 covered in the Table Cape Beds, but it is in an excellent 

 state of preservation; its beautiful sculpture, which sug- 

 gests the name I am giving it, is as perfect as it was during 

 life. The shell is remarkably flat, although carinated. 



Pleural mid Dorsal Areas. — These are evenly decorated 

 with narrow, strongly raised, wavy ribs; these in places 

 are bridged by transverse ribs following the growth lines. 

 These are particularly marked towards the anterior margin, 

 where the transverse ribs resemble a string of small beads. 

 Towards the posterior portion of the valve this feature of 

 the sculpture is somewhat modified, and might be more 

 correctly described as a series of irregularly and widely 

 spaced grooves, following the growth lines and breaking to 

 some extent the longitudinal ribs where they cross. These 

 longitudinal ribs are more or less confluent on the jugum, 

 and to a limited extent in the pleural area. 



Lateral Area. — This area is much raised and strongly 

 decorated with coarse, radiating^, wavy ribs; these are 

 broken at irregular intervals by deep grooves, which are a 

 continuation of the growth lines which cross the pleural 

 area, and turn abruptly at less than a right-angle across 

 the lateral areas. 



Inside. — Eaves well developed, insertion plates 1 slit,, 

 evidences of not very pronounced serrations. The sutural 

 laminae are well developed, and appear to be much less 

 produced forward than is the case with L. angasi, Ad. and 

 Ang., the anterior margin throughout being almost straight, 

 but in places it is a little broken; therefore, in a perfect 

 shell, this feature may be less pronounced. The suture is 

 broad, and the slits on either side thereof are absent. The 

 anterior margin of the callus portion is almost straight, and 

 the thickening very pronounced. The tegmentum is folded 

 over the posterior margin in a similar manner to both 

 L. angasi, Ad. and Aug., and L. torri, Ashby, with this 



