HARDWICKE'S SCIENCE-GOSSIP. 



273 



Prof. Nicholson, in describing his species Cerio- 

 pora (?) Ilaiiiiltonciisis, is more minute in particu- 

 larizing the true character of the genus, but scarcely 

 more concise than Busk. Prof, Phillips, to whom we 

 owe much, as being the earliest investigator who 

 patiently figured several species of Polyzoa, gives the 

 fallowing as the characteristic of the genus Millepora : 

 "Branches cylindrical, with acute rhomboidal cells 

 in quincunx." Since his time the genus has been 

 more particularly studied, and the result of later in- 

 vestigations has led to a division of the genus into 

 ihree genera, if we may place in this family the 

 Hyphasmopora of Mr. Robert Etheridge, jun. 



Ceriopora interporosa {Millepora inter.) Phillips. 

 ,, gracilis ,, gra. ,, 



, , siutilis , , 



RJiabdomeson gracile {Millepora Fhill.), Young & 

 Young. 



RJiabdomeson rhombiferum {Millepora PkilL), 

 Young & Young. 



Hyphasmopora Btiskii, Robt. Etheridge, jun. 



account of the insufficiency of the work done. 

 Phillips, in his " Geology of York," speaks of 

 it doubtfully under the name Flustra{l) parallela, 

 and his minute description is reproduced here 

 without any comment: — "Linear: longitudinally 

 and deeply furrowed, cells in the furrows ; in quin- 

 cunx, their apertures oval, prominent ; side fur- 

 rows without cells ; it seems to have been a 

 tubular or folded membrane, the number of rows 

 of cells varies in different specimens. No sign of 

 ramification."* 



The genus has passed under the name of Viiicularia 

 parellela and Suleoretepora parellela, and by the latter 

 name it is now more generally known. I have speci- 

 mens from several English and Scotch localities, some 

 of which differ sufficiently as to be characterized as 

 different species, three of which are given in the 

 Catalogue of Western Scottish Fossils, compiled for 

 the British Association of 1876. Suleoretepora 

 parallela, Phillips; S. raricosta, M'Coy; .5'. 

 Robeitsonii, Y. & Y., MS. 



% 



J 



Fig. 203. Glanconoine Fig. 206. Glau- Fig. 207. G. mar- Fig. 208. Sul- 

 ((Lowie). coiwine, sp. ginatis [Diplo- coretipora 



poni). (Hairmyres). 



Fig. 209. Siilco?-eii- Fig. 210. Siilcoreii- 

 pora, sp. />ora, sp. (Redes- 



dale). 



Fig. 211. Cell-structure of Transparent G/awtf/wwc. 



c-^' 



£^ 



Fig. 212. Thaiiiniicus (furrowed like Sulcoretipord), Young 

 Form, magnified 



The Hyphasmopora Biiskii has always been con- 

 sidered by me a peculiarly Scottish species and of 

 very local occurrence. It is found rather scantily in 

 the shales of Capelrig. High Blantyre is given as 

 another locality, but in the minute investigation of 

 my Richmond material spoken of previously, I came 

 across five small fragments, slightly differing from the 

 more characteristic Scottish species, of this beautifully 

 delicate genus. 



Another genus of Carboniferous Polyzoa had a 

 very wide geographical range, although the species 

 of the genus were very few, or apparently so, on 



Another of ^Messrs. Young's new species is one 

 called by them Thamniscus {?) Rankini. "The 

 stem is free, dichotomous, circular, about -^ inch in 

 diameter, branches in one plane. Celluliferous face, 

 equal to two-thirds of circumference, cells arranged 

 in spirals, the left - handed series longer than the 

 right-handed ; cell aj^ertures circular when entire, be- 

 coming oval when worn ; lower lip prominent, mar- 

 gins of aperture tuberculate. Intercellular surface 

 covered with finely tubercular ridges, whose termina- 



PhilHps's "Geology of York. 



