BRACHIOPODA. 



317 



Mr. Davidson, in his Devonian Brachiopoda,* has referred the Devonian 

 species, Orthis productoides, Murchison, to Strophalosia, but it shows no evidence 

 of attachment, and more properly belongs to Productella. Professor King 

 had previously made a similar reference of this species,f and included in the 

 same genus Productus subaculeatus, Murchison, an unattached species, subse- 

 quently taken as the type of Productella. 



Genus DAVIESIELLA, Waagen. 1884. 



1823. Productus, Sowekey, Mineral Conchology, vol. iv, pp. 31, 329. 



1837. Lepteena, Fischer. Oryctog:r. du Gouvei-n. de Moscou, p. 143, pi. xxii, fig. 1. 



1842. Producta, D'AHonrAC and db VEENBDrL. Trans. Geol. Soc. London, 2nd Sei-., vol. vi, pt. ii, p. 397. 



1846. Chonetes, de Keyserling. Beob. Reise in das Petschora-land, p. 214, pi. vi, fig. 1. 



1847. Chonetes, de Koninck. Monogr. du Genre Chonetes, \>. 189, pi. xix, fig. 1. 



1861. Chonetes, Davidson. Bi-itish Carboniferous Brachiopoda, p. 180, pi. xlv, figs. 1-7. 



1862. Productus, Davidson. Brit. Cai-b. Brachiopoda, pp. 275, 277, pi. xlvi, fig. 1 ; pi. Iv, figs. 6-10. 

 1884. Daviesiella, Waagen. Mem. Geol. Surv. India ; Palseontologia Indica, Ser. xiii, vol.i, No. 4, p. 613. 



Dr. Waagen writes : 



" I create this genus for the reception of such forms as Productus Llangollensis, 

 Dav., and Prod, comoides, Sow., which are characterized by cardinal teeth and a 

 second pair of adductor impressions in the ventral valve. The other characters 

 are like those of Productus. Mountain limestone." — op. cit. 



Fig. 27. Productus {DaviesieUa) Llangollensis, Davidson. 

 After Uaviuson. 



' Page 97. 



t Permian Fossils, p. 95. 



