NOTES AND CORRECTIONS. 123 



the species of Deslongchnmps is thus removed. The specimen figured Tab. XLI, fig. 13, exlnl)its the first 

 spine, which is mouodactyle ; a second and much larger spine, also monodactyle ; the third and ultimate 

 spine being didactyle. 



Acteonina?, Part I, Tab. VIII, fig. 12*, is the young shell of ^-Z. olivceformis, p. 103. 



Lima Luciencis, D'Orb., 'Gr. Ool. Mon.,' Part II, p. 28, Tab. Ill, fig. 4. This shell is a synonym of 

 Lima rudis, Sow. The number of costse vary from eigiit to eleven ; the specimen figured in the ' IMineral 

 Conchology,' tab. 21-1, has only seven costae, and the figure is unusually gibbose. Its geological range is 

 considerable ; it occurs sparingly in the Great Oolite of the Minchinhampton district and in the Cornbrash 

 of the coast of Yorkshire, but in the Coral Rag of Malton it is moderately abundant. 



Sub-genus Crossostoma, Part I, p. 72. Of the three Oolitic species assigned to this proposed sub-genus 

 of Delphinula, the only one which exhibits the distinctive characters is C. Pratii ; the other two forms, 

 discoideum and heliciforme, were formerly supposed to represent in their apertures the immature condition 

 of that sub-genus. Subsequent observations of numerous specimens has compelled me to abandon that view, 

 and to regard discoideum and heliciforme as adult shells, or discoidal forms of smooth Monodonta. Other 

 examples of Monodonta allied to the Great Oolite forms, but less depressed, have been figured by Messrs. 

 Hebert and Deslongchamps, in their ' Memoir on the Kelloway Rock Fossils of Montreuil-Bellay,' under 

 the names of Monodonta ovulata and papillata. 



Cerithium quadricinctum, Goldf., and C. limceforme, Roem. These two forms must be united into one 

 species ; individuals with large nodules and with only three distinct rows have been assigned to C. limce- 

 forme, but, even with these, indications of a fourth row are occasionally to be discovered, and the promi- 

 nence of the nodules, and their number in each volution, are very variable. C. quadricinctum has a 

 considerable geological range, and it occurs also in the Coral Rag of Germany. 



Patella suprajurensis, Part I, p. 92, Tab. XII, figs. 9, 9 a. I can now only regard this form as a variety 

 of P. Aubentonensis, in which the lamellae of growth are strongly marked and the cancellated lines have 

 disappeared. It is also not uncommon to meet with smooth examples of the latter species. 



Pholadomya solitaria, Part II, p. 124, Tab. XI, fig. 1, et Tab. XII, fig. 2 ; erroneously printed P. oblita 

 upon the reference facing the latter table. Pholadomya oblita is Tab. XII, fig. 5, p. 142*. The variations 

 of figure and of ornamentation, either separately or combined, are so considerable in the cordiform examples 

 of Pholadomya, that a large number are indispensable to enable us to legislate upon them with any 

 confidence ; probably P. solitaria is only a variety of P. deltoidea, Sow. 



