236 THE CANADIAN NATURALIST. [JuDC, 



hibited eight different species of this genus, and pointed out lucidly 

 the difference between them. After exhibiting a species of Ser- 

 pula, with its irregular cylindrical shelly tube, the Doctor called 

 attention to some of the Bryozoa of the Gulf. He stated that 

 some of the species resembled brown sea-weeds, others corallines, 

 but that the structure of the animals was nearest to that o'' some 

 of the bivalve shells. He exhibited examples of some fifteen or six- 

 teen species, illustrating the subject by diagrams,and by microscopi- 

 cal preparations showing the shape of the cells ofthese creatures, and 

 some of their organs of defence. After some discussion as to the 

 supposed uses of these animals, the meeting broke up. 



On the Bivalved Entomostraoa of the Carboniferous 

 Strata of Great Britain and Ireland. 



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



After a review of wliat former obs rvers liave published on the 

 Bivalved EntoraostracH of 'he Carbonife oiis f >rmations, the au- 

 thor- proceed to point out : 1st, a few rather doubtful Cypr)des 

 or Candonce, from th^^ Coal-measure** 2nilly, Cytheres ; of which 

 theie are about ei^ht sp^ci'^s. chiefly from the Coal-measures. 

 3r lly. Balrii'B ; ab >at eight species, rao-^ily from the MoiMtain- 

 lim stone an I ir«; shales. 4thly, Cypridini/nce ; comprising 

 Cypri'llna, (Jyprldella, Oyprella, E'ifom >conckas, and Cytherellaj 

 from the Mouii ain-li uestoiie. A fine collectioi of these rare torms 

 from Little Isla-ul, Cork, liberally |.Ihc d at Messrs. Jones and 

 Kiikby's dis|)osal by Mr. Joseph Wrioht, will elucidate ih^ rela- 

 tioiishi|ts of the-e iiitherto obscure genera and their species. 

 5thly, Leperditidce ; comprisina: Leperditia (to which genus 

 belo'iuf the so .-alle I Gypris Scofoh'irdigalensis^ C. inflate, C^ 

 suhrectaj Cythere inornata, and others ; many of them dwarf 

 varieties oi' on(- spe'-ies, and mostly belonging to the Mountain- 

 limesione serit-s) ; Entomis (MountMin-limesione), D. vonian and 

 Carboniteroiis ftrins of which have been mistaken for Cypiidinid- 

 n<B ; B'ynchim (from nearly all parts of he Carlwniferous sy>tem, 

 sevt^ral species, of which B. arcua'a. Bean, sp., is the most com- 

 mon); and ICi'kbyoe, somewhat rare, and chiefly from the Moun- 

 tain-limestone seri s. 



Leperditia and Beyrichia are also Silurian and Devonian 

 genera; they do not appear to pass upwards into the Permian 



