BRITISH SILURIAN BRACHIOPODA. 147 



30. Triplesia (?) MONiLiFERA, Ji'%, sp. Sil. Moii., PI. XXV, figs. 3—5; Sil. Sup., 



PI. VIII, fig. 31. 



A specimen of this small species has been found by Mrs. R, Gray in the Middle 

 Llandovery at Woodland Point, Girvan, Ayrshire, and is the first Scottish specimen 

 hitherto discovered. We unfortunately know nothing as to its internal characters, nor 

 of those belonging to the Triplesia ? 3Iaccoyana, Dav., sp. 



Genus — Leptocgelia, Hall, 1857. 



{Etym., leptos, slight ; koiliay belly ; in allusion to the shallow visceral cavity.) 



31. Leptoccelia HEMispHiERicA, /. de C. Sow., sp. Dav. Sil. Mon., PI. XIII, figs 23 — 30. 



In p. 136 of my 'Silurian Monograph' I left this species with much uncertainty 

 ■with Atrypa, where Sowerby had classed it in 1839. It is fully described in my Mono- 

 graph ; and, as all the researches I have made to discover in it spiral appendages have 

 led to no result, I think it will be preferable to class the shell with Leptoccelia. It 

 is a very common fossil in certain rocks and localities. It occurs generally in the condi- 

 tion of internal casts, and is plentiful in rocks of the Llandovery period at Penkill, and 

 Newlands, in Ayrshire. Complete examples with the shell are extremely rare in our 

 Scottish Silurian rocks. See also above, p. 133. 



Genus — Rhynchonella, Fischer, 1809. 

 (See also above, p. 134.) 



Since describing the species referable to this genus at p. 163 of my ' Silurian 

 Monograph,' several new forms have been discovered, especially from the Upper 

 Llandeilo of Scotland. Better material has also been obtained of a few of the described 

 species, which will enable us to add some details to those already published. Of 

 some of the species the material has not been sufficiently perfect or abundant to enable 

 me to feel quite certain as to their distinctive character, but I have thought it preferable 

 to give them provisional names, in the hope that more specimens will be sought for. 



A table is here appended showing the range of the British Silurian species of the 



