NOTES ON CERTAIN GENERA AND SPECIES. 165 



Solenopsis having been shown to be already in use for a genus of ants, the nana' 

 Solenomorjpha has been substituted for it. 



Aoiculopecten. — A paper by G. H. Girty appeared in the 'American Geologist,' 

 vol. xxxiii, in May, 1004, pp. 201-296, on "The Typical Species and Generic 

 Characters of Aviculipecteu, M'Coy." (This is the spelling he affects.) He 

 enters into the question of the type of the species, and considers that A. flexuosus, 

 M'Coy, which I have shown (ante, p. 00) to be only a synonym of A. semicuxtahi*, 

 Portlock, should be the type on the ground that M'Coy states that the hinge- 

 characters were noted first in some specimens from Lowick, and therefore, as this 

 was the Lowick species, it must be the type. I have assumed the type to be the 

 first species described under the generic title, viz., A.planoradiatus, M'Coy, a species 

 founded in error on the left valve of the previously described Pecten tabulatus, 

 M'Coy, which I therefore recognised as the type of the species. I have no doubt 

 in the future, if hinge-plates of the various species described under Aviculopecten 

 occur, that it will be necessary further to subdivide that genus. 



Sanguinolites contortus, M'Coy, sp., 1844. — I was in error in mentioning this 

 name as a synonym of Allorisma Audicei. I have since examined the type, and find 

 that it agrees with the species I described under the title S. Idbcvuicus. This must, 

 therefore, disappear in favour of M'Coy's name. 



Table I. 



It has been suggested to me that it would be well to indicate in a tabular form 

 the synonomy of the species of Carboniferous Lamellibranchs described by British 

 authors and the names adopted in this monograph, so that any change in nomen- 

 clature might be seen at a glance. 



1800. Martin, ' Petrefacta Derbiensia.' 



Arcites cancellatus is Pardllelodon cancellatus. 



„ rostratus ,, Cunocarditiiii rostratiint. 



Pinnites Jlabelliformis „ Pinna flabelliformis. 



My a ovalis „ Carbonicola ovalis. 



1813-27. Sowerby, ' Mineral Conchology.' 



Sangainolaria ijibbosa is Sanguinolites gibbosus. 



Cardial)/ llibernicum „ Conocardlum Hibernicum. 



„ elongatwn 



„ aliforme 

 Inoceramus vetustus 

 Isocardia oblonga 

 Nucida falmee 



„ rostratum. 



„ aliforme. 



Posidon iella vetusta. 

 Cardiomorpha oblonga . 

 Nucida palmse. 



23 



