166 C- A. Westerlund, 



3. Saccatus Rossm. Concha postice dilatata, inferins saccata; alt. us- 

 que 36, long'. 75, lat. '25 mm. (Russm. Ic); concha epidermide splendida, obscure 

 genea, numquam viridi-radiata , parte posteriore non in rostrum conicum ])roducta, 

 sed lata, sensini compressa, linguieforiui, limo semper obducta, natibus decortica- 

 tis , semper lœvibus , dentibus cardinalibus yalidis , niargine serratis vel crenatis. 

 Long. 100—110, alt. 50 mm. (Westerl. Mai. Bl.). 



Unio tumidus var. saccatus Rossmassler Iconogr. XVIII (1859) p. 138 fig. 969. We- 

 sterlund Coll. Typ. Moll. Su. (1868) n:o 128. 

 Unio (tiiiiiidus) elegans Westerlund in Malak. Bl. XIV (1867) p. 206. 



Hab. In Suecia forma typica passim in provinciis Skåne, Små- 

 land, Östergötland, Westergötland, Nerike, Upland et West- 

 ma ni and; Conus in fossis ad Christianstad pro v. Skåne copiose; sacc. a 

 clariss. LovÉN, Kinberg et Hansen ad Rossmassler missus a Kisasjön, 

 FöUingarne , Asunden, Köflefors-ån, Hargsjön, Ammern et Svartån prov. 

 Östergötland, in Wersjön, Bodasjön, Emån et Hulingen prov. Småland 

 gub. Kalmar, in Köpingeån prov. Skåne (RosSM. 1. c.); in prov. Dal ar ne 

 in lacu Brunnsjön par. Hedemora invenit C. E. Grill, teste amie. C. G. 

 Andersson! 



3. UNIO PICTOEUM (Lin.). 



Concha elongata, minus ventricosa; dentés cardinales valvse sinistrse 

 duo, cristati, posteriore multo minore, ssepe evanescente. 



1. Typicus. Concha ovali-oblonga , humilis, posterius in rostrum trun- 

 cato-obtusatum producta, margine dorsali rectiusculo, postice angulum obtusum 

 formante, ventrali recto, medio subretuso, viridi-lutescens, fusco-cingulata ; nates 

 tuberculatœ vel, decussatœ, undulatse. Long, 75 — 85 mm. 



Mya pictorum Linné Syst. Nat. X (1858) p. 671. 



Unio pictorum Eetzius Nov. test. gen. (1788) p. 17. Nilsson Hist. MolL Su. (1822) 

 p. 111. Rossmassler Iconogr. I (1835) p. 118. JMahn pr. p. Göteb. Vet., Vitt. 

 Sarah:s Handl. Ill (1855) p. 119. Mörcli Syn. Moll. Dan. (1864) p. 88. We- 

 sterlund Sv. Moll. (1865) p. 132; Coll. Typ. Moll. Su. (1868) n:o 129. 



a uiaxinivis: rugœ incrementi dimidii aiitici grossœ, diraidii postici ob- 



soleti.ssiniœ; long, interduin ad 100 mm. Rossin. figg. 196, 587. 

 jS Isevigatiis: concha minor, hurailior, rugis incrementi plus minus ob- 



soletis. Rossm. fig. 71. 

 Y deshiiyesi Mich.: concha flavo-viridis, rugœ incrementi dimidii an- 



tici numerosiores, area lamellis confertissimis, medio obtuse-angulata 



abbreviata, (Mörch.) Rossm. fig. 197. 



