150 E. Etheridge, Jun. — On Carboniferous MoUusca. 



they were first developed in the Scandinavian area as in any other. 

 Certainly there is no other area where there are so many forms of 

 animal life known in the oldest Cambrian rocks as in Scandinavia. 

 Geological Survey Office, Stockholm, Jan. 22, 1876. 



II. — Notes on Carboniferous Mollusca. 



Ey E, Etheridge, Jun., F.G.S. ; 



Of the Geological Survey of Scotland. 



(PLATE VI.) 



Class POLYZOA. 



Genus Yincularta, Defrance. 

 Vincularia Benniei, sp. nov. Plate YI. Figs. 1, la. 



Specific Chars. — Polyzoarium composed of small cylindrical stems 

 occupied by oval to hexagonal cells arranged usually in quincunx ; 

 or in oblique ascending lines ; periphery of the cells erect, sharp, and 

 granular ; granules minute, numerous, and closely arranged. Here 

 and there the angles between the cells are occupied by a small sup- 

 plementary pore or pores, which are occasionally increased in num- 

 ber, and extend vertically between two contiguous cells, or uniting, 

 give rise to an elongated narrow groove-like slit. Section circular. 



Ohs. — This little Coralline is only known to me in the form of 

 small fragments, of which the figured specimen is a good example. 

 The cells appear to be of one uniform depth, but the intermediate 

 pores are perhaps not quite so deep. From V. multangularis, Port- 

 lock,^ it is distinguished by the cells not being placed in furrows, 

 and from Favosites serialis, Portlock,^ which it more closely resem- 

 bles, it is distinguished by the presence of the granules and pores, 

 and the absence of the broad intercellular spaces of the former. 

 V. Benniei is also closely allied to a form described by the Chevalier 

 d'Eichwald from the Fentamerus Limestone of Talkhof, in Livonia, 

 as V. nodulosa.''^ In this species the cells are oval with thin 

 trenchant edges, separated one from the other by a small groove, and 

 occasionally but not alwaj^s granuled, having in addition at the 

 upper angle a small node, larger than the granules. In V. Benniei 

 the cells are, as a rule, hexagonal, the periphery always granuled, 

 without any node which can be said to be larger than the others, and 

 the cross section of the polyzoarium not so angulated as appears 

 to be the case in the Russian species. 



In Ceriopora ? interporosa, PhilL, the cells are oval or a little 

 pyriform, the intercellular spaces broader and more irregular than in 

 V. Benniei, and destitute of granules, and the habit is generally 

 different. In Millepora (Ceriopora) similis, PhilL, the cells are more 

 elongated, and there does not appear to be any trace of interstitial 

 pores in Phillips' figure. (Pal. Foss. t. 11, f. 32.) 



Log. and Horizon. — Shale over No. 2 Limestone (Lower Carb. 



- Geol. Eept. London, 1843, p. 339, t. 22«, f. 7. ''^ I.e. p. 327, t. 22a, f. 6. 



3 Lethfea Rossica, 1860, vol. i. p. 402 ; Atlas, t. 24. f. 8. 



