156 C- A. Westerlund, 



Spharium lacustre Jeffi'eys Brit. Couch. I (1862) p. 10. 0. Möich Syn. !MolI. Dan. 



(1864) p. 71. 

 Cydas lacustris Reeve Brit. Moll. (1863) p. 241. 



Hab. In Suecia, prov. Westergötland circa Güteborg (in Qville- 

 bäcken, Mölndals à et in Stadsvassen, formain crassiorera in piscinis ad 

 Arred, Kärralund nec non ad Gunnebo et in Dahlins damm) hane speciem 

 frequentem invenit clar. Malm. 



SPHAERIUM ' CALYCULATUM (ür.u'.). 



Concha subrliombeo-ovalis, subintequilatera, tenuissima, fragilis, dia- 

 phana, siibtiliter striata, cinerea, radiis saturatioribus confertis sajpius or- 

 nata, ventricoso-compressa, antice producta, postice subrotundata, umboui- 

 biis inäatis, natibus acutiusculis , incurvis; margo dorsalis versus priorem 

 concilie partem declivus, anterior subleniter praîruptus, ventralis elongato- 

 cnrvatus; marlines (conchse-clausse) acuti. Long. 9, alt. 8, er. 4' mm.; vel 

 10 1., S lat., 6 er. 



Cyclas calyeulata Draparnaiul Hist. Moll. (1805) p. 130 t. 10. f. 14, 15. Nilsson Hist. 



Moll. Su. (1822) p. 99. Friele Noreke Moll. (1853) p. 51. Moquin-Tandon Moll. 



Fr. II (1855) p. 594 i. 53. f. 34. cum a majore f. 36, 37). Nord, et Nyl. Fini. 



Moll. (1856) p. 79. f. 66 (Hg. mala). 

 Sphcerium cali/culatum Mörcli Syn. Moll. Dan. (1864) p. 71. Westerlund Coll. Typ. !Moll. 



Su. (1868) n:o 114. 

 Sphcerium lacustre Westerlund Sv. Moll. (1865) p. 123. 



ß brochouiiuumi Bourg.: condia magna, angulato-ovalis, elongata, 

 compressa, cinerea, pulchre striata, umbonibas viridi-lutescentibus , 

 zona marginali undique pallide lutea; margo dorsalis vix declivus; 

 long. 12, alt. 10, er. 6 mm. — Ci/clas calycidata var. Malm 1. c. p. 

 82. cum fig. 



Hah. In Sueoia brec forma passim occurrit in prov. Skåne; in 

 prov. Blekinge ad Ronneby; ins. Gotland ad Suderbys Westerliejde et 

 in Fardhem cop. (Lindström); passim in prov. Östergötland et Wester- 

 götland (in Kopparsjön ad Mölltorp copiose: J. A. Wallin!!); prov. Ne- 

 rike: ad Örebro multis locis, ad Damsäter par. Axberg et ad Skarsäter 

 par. Asker (Hartman,); ad Stockholm passim (ex. gr. in Clara sjö, ad 

 Carlberg et in Djurgårdsbrunnsviken); prov. Upland multis locis prope et 

 in Fyrisån; prov. Westmanland passim in regione lacus Mälaren (Jo- 

 hansson!); prov. Dal ar ne ad Säther in Dalsbysjön (C. G. Andersson!!). 

 /3 broch. ad Göteborg (Malm et ipse). In Norvegia hanc formara certe 



