- 99 - 



Äncylus obscurus C. B. Ad. I Contr. passlm. 



„ „ Bourg. in Pet. Journ. 1853. p. 179. 



Hab. Ad arundines et saxa iii rivulo prope Humacao, raris- 



sime. 

 Obs. Inpiimis in St. ün. Ainer. Bor. detecta , etiam in St. 

 Thomas et Jamaica occurrens. Genus intricatlssimum ten- 

 taraine nionograpliico cl. Bourguignat l. c. vix elucidatum. 



88. Aiiiiiicola crystallina Pf. 



Syn. Paludina cryslallina Pf. in VViegm. Arch. 1840 , I. 

 p. 253. 

 „ „ Küst. in Chemn. ed. II., p. 50, 



t. 10 , f. 7, 8. 

 „ Jamaicemis C. B. Ad ! Contr. p. 43. 

 „ anlhracina^Vighl Proc. Bost. Soc.1845, p.22. 

 „ cislernicüla !\lore!et Test. Nov. II. p. 135. 

 Var. ß. coronata, anfr. superne spinoso-carinatis. 

 Syn. Paludina coronala Pf. I. c. 



„ „ Küst. I. c. f. 9—12. 



„ ornala Morelet. 1. c. 

 Var. y spinifera , anfr. superne spinoso-carinatis , ultimo 



subtus spiraliter lirata. 

 Syn. Mclania spinifera C. B. Ad I Proc. Bost Soc. 1845. 



p. 17. 

 Var. d. elongata, spira graciliori, acuta, anfr, minus con- 

 vexis, 

 Hab. Forma typica et var. ß. , intermixt» in rivuüs et stagnis 

 insula; Vieque ; y. specimina pauca in Portorico prope Hu- 

 macao et Luquillo; d. in rivuüs prope Aguas Claras et Ceiba, 

 copiose. 

 Obs. Per insulas Caribajas omnes, ut videtur, distributa, transi- 

 tiones omnes inter formam typicam et var. y. ostendcns. 

 Habeo e Cuba , Jamaica , Tortola, St. Jan, St. Thomas, et 

 occurrit, fide Morelet, in Campeche. 



C. B. Adams var. y. sab Melanin spinifera descripsit, 

 sed saepissime sub hoc nomine var ß. accepi. Paludeslrina 

 Candeana Orb. , secundum specinuna in Guadeloupe a Krebs 

 lecta, et mihi nuperrime ab am. Bland commuiiicata, a var. y. 

 statura fere duplo majore differre videtur. 



89. IVeritina virginea Lara. 



Syn. Nerilina Brasiliana Recl. 



„ virginea Sowb. Thes. p. 533, tab. 116, f. 

 232 239. 



