MARGARITIFERA 345 



p , r Alasmodon margaratifervs, Fleming : Brown, Illust. 

 ^ . J Conch. Brit., od. 2, p. 83, pi. xxx*, f. 1-4, 



jg^'Jj xxxi, f. 1, 2, xxxii, f. 1-4, 13-15. [This 



■ y includes five varieties.] 



1840, 1 Alasmodon elongatus : Thompson, Ann. <& Mag. Nat. 

 Nov. / Hist., vi, p. 200. 



1841. Alasmodon arcuata, Barnes : Gould, Invert. Mass., 



p. 113, f. 75. 

 18'45. Alasmodon margaratiferus, Fleming : Brown, Illust. L. 



& F.-W. Conch. Brit., p. 112, pi. xxi, f. 12, 



xxii & xxiii. [This includes five varieties.] 

 1847. Damalis [sic] margaritifera, Leach MSS. 1818 : Leach, 



commun. J. E. Gray, Ann. & Mag. Nat. 



Hist., XX, p. 273. 



,ojq ( Margaritana marqaritifcra, Retz. : Dupuy, Cat. Ex- 



i, , '- " traimir. GalUce Test. [p. 2], no. 213. (Hist. 



[ Moll. France, 1852, p. 623, pi. xxii, f. 14-16.) 



1849, \ Margaritana elongata. Lam. : Dupuy, o. c, no. 214 



Feb. J [Merged in synon. in the Histoire]. 



1849 ( ^***^ margaritiferus, Linnaeus : Forbes & Hanley, Brit. 



. '- Moll., ii, p. 146, pi. xxxviii [as Alasmodonta 



^ ■ [ margaritifera.] 



1852 ) 



t;, /^' ^ Damaris elongata : Leach, Moll. Brit. Synop., p. 322. 



1852,) Margaron (Unio) crassus, Retz. : Lea, Synop. Fam. 



June./ Naiades, ed. 3, p. 39. 



1852,\ Margaron (Margaritana) margaritifera, Lea : Lea, o. c, 



June. J p. 43. 



1853. Baphia margaritiferus, L. : Morch, Cat. Conch. Yoldi, 



ii, p. 48. 

 1856. Unio (Margaritana) margaritifer : Moquin-Tandon, 



Hist. Moll. France, ii, p. 566, pi. xlvii. 

 1857,") Alasmodon margaritiferus, Linn. : Gray, in Turton's 

 Sept./ Manual, new ed., p. 277, pi. ii, f. 9. 



?1857,) Unio (Bariosta) crassus, Retz. : H. & A. Adams, Genera 

 Sept./ Moll, ii, p. 491. 



1857, \ Baphia margaritifera, Linn.: H. & A. Adams, t.c, 

 Sept./ p. 499. 



1862. Unio margaritifer, Linne : Jeffreys, Brit. Conch., i, 



p. 37; V, pi. ii, f. 3. 



1863. Unio margaritifer, Linnajus : Reeve, L. & F.-W. Moll. 



Brit. Is., p. 223, fig. 

 1877. Margaritana margaritifera, Linne : Clessin, Deuisch, 

 Excur. Moll. Fauna, p. 449, f. 293. 



First recorded as British in 1681, by M. Lister (Hist. 



Anim. Angl., Append., p. 11, pi. i, f. 1), from the 



River Tees. 

 British Distribution in Time : Holocene and Recent. 



