480 



THE GEOLOGIST. 



conspicuous members of a rich Ehizopodal fauna), some were taken 

 at from 15 to 20 fathoms, namely, Quinqueloculina agglutinans, Q. pul- 

 chella, Orbiculina compressa, and O. adunca ; some at from 50 to 100 

 fathoms, namely, Orbiculina compressa, JDentalina acicula, and Orbitolina 

 vesicularis ; and several others at from 100 to 250 fathoms, namely, Denla- 

 lina acicula, D. communis, Cristellaria rotulata, C. cultrata, C. calcar, 

 Frondicularia complanata, Amphistegina vulgaris, Polytrema miniacea, 

 Bigenerina nodosaria, Verneuilina tricarinata, Textularia troclius, T. 

 Barrettii, Cuneolina pavonia, Liiuola scorpiurus, and L. Soldanii. 



Cuneolina, a rare form, hitherto known only by figures, and description 

 given by D'Orbigny, proves (as suspected) to be a modification of Textu- 

 laria ; and T. Barrettii is intermediate between it and Textularia proper. 

 The Frondicularia? are remarkably large and beautiful ; and the Cristel- 

 larice and Dentalince are also large and relatively abundant. 



This fauna is almost identical with the fossil Foraminifera of the Ter- 

 tiary "Pteropod-marl" of Jamaica, above mentioned, specimens from which 

 also were given by the late Mr, Barrett in 1862 to the authors of this notice. 



ON THE BIVALYED ENTOMOSTRACA OF THE CARBONIFEROUS 

 STRATA OF GREAT BRITAIN AND IRELAND. 



By Professor T. Rupert Jones, F.G-.S., and J. W. Kirkby, Esq. 



(Read before the British Association, at Newcastle, September, 1863.) 



After a review of what former observers have published on the Bivalved 

 Entomostraca of the Carboniferous formations, the authors proceeded to 

 point out — 1st, a few rather doubtful Gyp rides or Candonce, from the coal- 

 measures. 2ndly, Cytheres ; of which there are about eight species, 

 chiefly from the coal-measures. 3rdly, Bairdice ; about eight species, 

 mostly from the mountain-limestone and its shales. 4thly, Cypridinidcs ; 

 comprising Cypridina, Cypridella, Cyprella, Entomoconchus, and Cytlie- 

 rella, from the mountain-limestone ; a fine collection of these rare 

 forms from Little Island, Cork, liberally placed at Messrs. Jones and 

 Kirkby's disposal by Mr. Joseph Wright, well elucidate the relation- 

 ships of these hitherto obscure genera and their species. 5thly, Leper- 

 ditidce; comprising Leperditia (to which genus belong the so-called Cypris 

 Scotoburd/galensis, C. injiata, C. subrecta, Cytliere inornata, and others ; 

 mauy of them dwarf varieties of one species, and mostly belonging to the 

 mountain-limestone series) ; Entomis (mountain-limestone), Devonian 

 and Carboniferous forms of which have been mistaken for Cypridince ; 

 Beyrichice (from nearly all parts of the Carboniferous system), several 

 species, of which B. arcuata, Bean sp., is the most common; and Kirk- 

 byce, somewhat rare, and chiefly from the mountain-limestone series. 



Leperditia and Beyrichia are also Silurian and Devonian genera ; they 

 do not appear to pass upwards into the Permian formation. Bairdia and 

 Kirlcbya occur first in the Carboniferous, and reappear in the Permian 

 deposits, even in the same specific forms ; and Bairdia has been freely 

 represented in Secondary and Tertiary deposits, and exists at present. Of 

 the Cypridinidtf under notice, Cypridella, Cyprella, and JEnitomoconclius 

 appear to be confined to the mountain-limestone ; Cypridina occurs in 

 the Permian, and with Cytherella is found in Secondary and Tertiary 

 rocks, and in existing seas. JEntomis is a Silurian and Devonian genus, 

 especially characterizing the so-called " Cypridinen-Schiefer " of Germany. 



