136* INVERTEBRATA. 



Salenia hieroglyphica, n. sp. 

 (Plate vii. fig. 11, a, b, c.) 



Description. Test circular, inflated, the summit more or less 

 elevated and obliquely pyramidal. 



Ambulacral areas narrow and prominent, widening very slightly 

 towards the mouth ; the borders ornamented with alternating rows 

 of large, mammillated granules, between which are scattered a few 

 smaller, simple granules. 



Poriferous zones narrow and flexuous ; pores unigeminal. 



Inter ambulacral areas wide with a double series of four or five 

 primary tubercles, increasing in size from the peristome upwards. 

 There is a moderately wide medial granulated zone, broader than 

 the ambulacral zone. Interambulacral plates short, only slightly 

 broader than high ; areolae of the tubercles large, running up bare 

 to the poriferous zone, but leaving a narrow border with large 

 granules above and below, and a wider, granulated area on their 

 medial margins. 



Base of test convex, the peristome being inflected. 



Mouth moderate, with small peristomal notches. 



Apical disc rather large, elevated, with festooned margin ; its 

 surface marked with large punctures, and groovings of varying 

 shapes — rounded, oval and triangular pits, graduating into deep 

 furrows. The punctures are best marked near the margin, the 

 central region being covered with deep, radiating and transverse 

 furrows. The specific name indicates the appearance of this part of 

 the test. 



Anus prominent, directed obliquely forwards towards the axial 

 (anterior) ambulacrum. Periproct triangular, strongly margined. 



The tubercles are of moderate size ; boss broad and gentle, 

 with coarsely granulated summit; the mammilla small. The 

 granules are of three orders : (i) the large bordering granules with 

 very large mammilla, and narrow-rimmed, steep boss; (ii) smaller 

 simple granules sparsely scattered ; and (iii) miliary granules, seen 

 abundantly amongst the larger types in the medial ambulacral and 

 interambulacral zones. 



Measurements. Diameter, 18 mm. ; height, 13 mm.; diameter 

 of apical disc, 11 mm. 



