68 CALCAREOUS ALGAE OF THE MIDDLE EAST 



Remarks. This species occurs in profusion in some samples as debris ; short 

 curved pieces of wall showing the pore-structure. These random cuts are commonly 

 at right angles to the wall and show the near-spherical cavities well ; other, tangen- 

 tial, cuts may show the inner narrow initial canals, or the arrangement of larger 

 external pore-openings. Larger pieces of wall showing much curvature are relatively 

 uncommon, and near-complete specimens are very rare. The holotype is a longi- 

 tudinal section showing two complete diameter-maxima and a third slightly crushed: 

 detail not seen on this specimen is well-displayed by debris in the same thin-section. 



P. ampidlacea differs in its distinctively lesser wall-thickness and rather smaller 

 pore-diameter from P. pertunda Endo (type), P. japonica Endo and P. iwaizakiensis 

 Endo. Also from the coarser P. likana Kochansky & Herak, known from elsewhere 

 in the Middle East (see below). In outline P. ampullacea is distinctive, though 

 Endo's description of the thallus of his fragmentary P. pertunda and japonica as 

 " somewhat undulating " may indicate a similar growth-form. 



Pseudoepimastopora cf. likana Kochansky & Herak 



(PI. 18, figs. 3) 4) 



i960 Epimastopora likana Kochansky and Herak : 78, pi. 4, figs. 5-10. 

 i960 Epimastopora sp. Elliott : 219. 



Fragments of Pseudoepimastopora occurring in the Permian of Jebel Qamar, 

 Oman, show a wall-section of 0-325 mm. thickness, with well defined ovoid pores of 

 0-130 mm. median diameter in vertical section. In this section the pores appear 

 oval with pointed ends, communicating with the interior by a short very narrow 

 canal, and with the exterior by an even shorter one. They are close-set, though this 

 feature varies in the limited material available. 



This species corresponds most closely to Ps. likana but the dimensions seem 

 larger. In the type-material of the Yugoslav species the wall diameter is given as 

 0-20-30 mm. (most frequently 0-25 and the pore-diameter maximum 0-07-0-10 mm. 

 (misprinted as 0-7-0-10 mm.). The Oman material is insufficient to be described 

 as new. 



The specimens occurred in thin-sections of limestone boulders yielding Anthro- 

 coporella mercurii sp. nov. Pseudoepimastopora fragments have also been seen in 

 derived Permian material in the Lower Cretaceous Upper Musandam formation of 

 Jebel Hagab in the same areas. 



Pseudoepimastopora iwaizakiensis Endo 



1953a Epimastopora iwaizakiensis Endo : 120, pi. 11, figs. 7-9. 



1963 Pseudoepimastopora iwaizakiensis (Endo) ; Fliigel : 88, pi. 1, fig. 6. 



Figured by Flugel (1963) from the Permian of the Taurus, Turkey. 



Genus PSEUDOVERMIPORELLA Elliott 1958 



Diagnosis (after Elliott). " Small gregarious meandriform calcareous tubes, 

 showing a free inner compact-walled tube and an outer tubular layer that is pierced 

 by numerous closely set radial pores arranged to form a regular mesh ". 



