NO. 1205. SYNOPSIS OF THE NAIADES— SIMPSON. 535 



tLAMPSILIS LUTEOLUS var. ROSACEUS De Kay. 



* Unio rosaceus De Kay, Zool. of New York, V, 1843, p. 192, pi. xxxix, tigs. 355, 356 ; 

 pi. XL, fig. 3.57.J— Conrad, Pr. Ac. Nat. Sci. Phila., \I, 1853, p. 257.— B. H. 

 Weight, Check List, 



' pjntire Mississippi drainage, southwest to the Brazos Eiver, Texas; 

 St. Lawrence drainage; entire Dominion of Canada east of the Rocky 

 Mountains; the variety rosaceus in the St. Lawrence area. 



t LAMPSILIS SUPERIORENSIS Marsh." 



* Unio superiorensis Marsh, Naut., X, 1897, p. 103, pi. i, figs. 1, 2, 5. 

 Upper Great Lakes region. 



t LAMPSILIS BOREALIS A. F. Gray.'- 



* Unio borealis A. F. Gray, Tr. Ottawa Field Nat. Club, 1882, p. 53, pi,, 3 



figures.— ^B. H, WriCxHT, Check List, 1888. 



Lower St. Lawrence drainage, to Lake Michigan; Lake of the 

 Woods. 



tLAMPSILIS RADIATUS Gmelin. 



""Mya racUata Gmelin, Syst. Nat., 13th eel., 1792, p. 3220.—* Wood, Gen. Couch., I, 

 1815, p. 109.—* DiLLWYN, Cat. I, 1817, p. 51.—" Wood, ludex Test. 2d ed., 

 1825, p. 12, pi. 11, fig. 2.—* Eaton, Zool. Text-Book, 1826, p. 220.—* Hanley, 

 Index Test., 3d ed., 1856, p. 16, pi. ii, fig. 32. 



*' Unioradiata Lamarck, An. saus. Vert., VI, 1819, p. 73. — * Deshayes, Hist. Nat. 

 desVers., II, 1830, p. 581; *An. saus. Vert., 2d ed., VI, 183.5, p. 535; 3d ed., 

 1839, p. 668.—^ Hanley, Test. Moll., 1842, p. 212. 



^ Lampsilis radiata Stimpson, N. Eng. Shells, 1851, p. 13. 



* Unio radiatus Spengler, Skriv. Nat. Selsk.,V, 1792, p. 3; III, 1793, p. 62.—* Con- 



rad, New F. W. Shells, 1834, p. 71.—* Ferussac, Guer. Mag., 1835, p. 27.— 

 * Conrad, Monog., II, 1836, p. 24, pi. x, fig. 2. — * Sowerby, Rich. Faun. Bore- 

 ali Am., Ill, 1836, p. 316.— * Gould, Inv. of Mass., 1841, p. 110, fig. 73.; 

 1870, p. 170, fig. 474.—* Hanley, Test. Moll., 1842, p. 193; ' Bir. Shells, 1843, 

 p. 193.—* Catlow and Reeve, Conch. Nom., 1845, p. 63. — * Conrad, Pr. Ac. 

 N. Sci. Phila., VI, 1853, p. 256.—* Kuster, Conch. Cab. Unio., 1852, p. 29, pi. 

 V, fig. 1.— *H. and A. Adams, Gen. Rec. Moll., II, 1857, p. 494. — * Reeve, 

 Couch. Icon., XVI, 1865, p. 27, pi. xxvii, fig. 139. — * Hartman and Miche- 

 NER, Couch. Cest., 1874, p. 87, fig. .182. — * Latchford, Tr. Ottawa F. Nat. 

 Club, 1882, p. 50.—* B. H. Wright, Check List, 1888.—* H. Carpenter, 

 Naut., IV, 1890, p. 22.—* P^tel, Conch. Sam., Ill, 1890, p. 165. 



* Margarita ( Unio) radiatus Lea, Syn., 1836, p. 25; 1838, j). 19. 

 " Margaron (Unio) radiatus Lea, Syn., 18,52, p. 29; 1870, p. 44. 



* Unio pictorum tenuis Indice, etc. — Chemnitz, Couch. Cab., 1788, p. 23, pi. il, 



fig. 7. 



' The type of De Kay's variety is a delicate shell with peculiarly pallid brown 

 epidermis, slightly rayed, and having a rose-colored nacre. This form is often desti- 

 tute of the fine tinting of the nacre, and sometimes becomes quite dark, eveu bronzy 

 or brownish black. It is common in the lakes of the St. Lawrence drainage. 



^This and L. 'borealis A. F. Gray are doubtful species which seem to stand between 

 L. luieolus and radiatus. This form is nearer luteolus, while Gray's species approaches 

 more nearly to radiatus. 



■^In Latchford's Notes on. Ot.taw.a: Unionidoi. 



