190 DEVONIAN FAUNA. 



Pinnatopora, but considered that G. disticlia, Lonsdale, should perhaps be called 

 Penniretipora. 



Dr. Gregory informed me in 1895 that he considered Pinnatopora a synonym 

 of Penniretipora, and following him I described two doubtful Lumrnaton species 

 under the latter name. 



It is clear from the above that our fossils cannot be called Glauconeme, and 

 that they can be called Pinnatopora. 



It seems rather doubtful whether Penniretipora is sufficiently defined to be 

 valid. D'Orbigny's definition is " Two rows of cells on one side ; the whole 

 pinniform, with a stem and free lateral branches." It is perhaps allowable to 

 discard the doubtful species he enumerates, and to restrict the genus to those 

 congeneric with G. bipinnata, Phillips ; in fact, to treat it as identical with Pinna- 

 topora, and therefore on the score of priority regretfully to regard the latter and 

 neater name as a synonym. 



1. PENNIRETIPORA BIPINNATA, Phillips, sp. Plate XXIII, figs. 6 8. 



1841. G-LAUCONEME BIPINNATA, Phillips. Pal. Foss., p. 21, pi. xi, figs. 33 a g. 

 1844. M'Coy. Synopsis Carb. Foss. Irel., p. 199. 



Description. Zoarium pinnate, elongate, generally curved and rambling, 

 sometimes sending forth a second midrib at an acute angle to the original one. 

 Midrib about '5 mm. wide near the base, decreasing very slowly in width, striated 

 and perhaps granulated on the reverse side, which appears rounded and possibly 

 rather flattened. Poriferous side with a strong (perhaps nodulated ?) keel, and 

 with obliquely flattened sides, each of which has a row of small rounded cell- 

 mouths, which appear to project rather forward, and to be thickened internally. 

 Cells oblong and elongate longitudinally, with thin walls, numbering two on the 

 midrib to each branch. Lateral branches starting from the centre of the sides of 

 the cells, set at an angle of about 70 to the midrib, free, straight, subcylindrical, 

 sometimes 3 mm. long, about half the width of the midrib and about two-thirds 

 the width of the intervals between them, with rounded extremities, and containing 

 two rows of from six to ten alternating cells ; from fourteen to eighteen branches 

 occupying a length of 10 mm. on the midrib. 



Size. A defective but longitudinally stretched specimen is 35 mm. long. 



Localities. Saunton Point, Croyde, Upcot Arch Quarry, Poleshill, Bradiford, 

 Frankmarsh, Top Orchard, Brushford. It appears to be of frequent occurrence. 



Remarks. Though from the state of preservation it is hard to be sure of its 

 exact character and dimensions, this species seems to have abundant distinguishing 



