NATURAL HISTORY SOCIETY OF GLASGOW. 33 



species of Synocladia (?) formerly referred to, (1st), by the character 

 of its interstices, they being all of a uniform thickness throughout 

 the extent of the frond, as in Fenestella, which it also much resembles, 

 in having its fenestrules more regular. In the other Scottish species 

 of Synocladia (?) the fronds have a plumose form of growth, with 

 branched interstices of varying thickness, and arched or curved 

 dissepiments, which produce great irregularity in the form of their 

 fenestrules. (2nd), The new species also differs in having no colls 

 upon the dissepiments, excepting at rare intervals where the inter- 

 stices become much branched. It is also distinguished by the 

 irregular supplementary cells of the normal size, placed on lower 

 levels of the interstices than the ordinary rows of cells which border 

 each side of the keel, but agreeing in all other generic characters 

 with the Carboniferous Synocladia (?) in having, on both faces of 

 the frond, the small irregular pores or foramina by which they arc 

 distinguished. 



Synocladia (?) fenestelUformis is found in fronds varying in size 

 from one to nearly three inches in diameter, but is not an abundant 

 form in any of the localities where it has been met with. It occurs a l 

 Xewfield, High Blantyre, along with S. (?) carbonaria, Etheridge, jun.. 

 from which locality I exhibit fronds of both species, removed from 

 the shale by the Asphalt process, so as to show the celluliferous 

 face. It is also found in the lower limestone shales at Corrieburn 

 on the Campsie Fells, and in the upper limestone at Gillfoot, Carluke, 

 where S. (?) Scotica, Y. and Y., also occurs. I have also to record 

 this latter rare form from the shales of Craigenglen, Campsie, a new 

 locality for the species. 



In looking over Prof. King's descriptions of other fenestrated 

 forms of polyzoa in his Permian monograph already referred to, I 

 was much interested in finding a description of a form -which agrees 

 far more closely with the character of the celluliferous and reverse 

 faces of our Carboniferous Synocladia (?) than that which exists in 

 his descriptions of the type specimens of S. virgulacea from the 

 Permian formation. This is a polyzoon formerly known under 

 various names, but which Prof. King erected into a new genus, in 

 1849, under the name of Thamniscus dubius, retaining Schlotheim's 

 specific name for the organism. In this genus, Prof. King points 

 out, at page 44 of his monograph, the occurrence, on casts of the 

 fronds of Thamniscus, of small hemispherical bodies, amongst the 

 cells of the poriferous face, which he concludes to be the homologues 



vol. v. c 



