250 ZOOLOGICAL RESEARCHES 



19. Claviger Byronensis Gray. — Fine specimens from 

 the St. Paul's River near Clay Ashland. 



20. Ampullaria halanoidea Gould. — Many specimens from 

 Grand Cape Mount and a few from the rocks in the St. 

 Paul's River near Bavia, one of which has the spire not 

 eroded. 



21. Ampullaria vitrea Born. — A good number of this 

 species , which formerly was very rare and the generic re- 

 lation of which was still misunderstood by Pfeiffer, has 

 been collected at Grand Cape Mount. 



22. Neritina ruhricata Mor. — A few specimens from 

 the Junk River, collected by Stampfli. 



23. Neritina Adansoniana Reel. — A single specimen 

 collected at Grand Cape Mount. 



24. Neritina Oweniana Gray. — One specimen without 

 exact locality, with the coluraellar plain blackish. There 

 are a few other specimens, from the St. John's River, 

 agreeing in most respects with the description of N. Hessei 

 Böttg. ; Dr. Dohrn thinks , that these are merely very old 

 specimens from rapid streaming water. 



25. Cyrenoides Dupontiae Joannis. — To this species 

 Dr. Dohrn brings a single valve of a shell found in the 

 St. John's River. 



26. Aetheria plumhea Fer. — One small specimen , which 

 is moreover in a bad state of preservation , from rocks in 

 the St. Paul's River near Bavia. 



27. Dreissena africana Van Beneden. — Many specimens 

 from the Fishermanlake near Bendo. All the specimens 

 are more or less eroded , and the two rows of minute 

 scales , described and figured by Van Beneden , are wanting. 



b. Marine Mollusks. 



1. Pyrula morio Linn. — A specimen from Grand 

 Cape Mount has the tubercles obsolete; two tuberculate 

 specimens and an intermediate one are collected by Stampfli 

 on the Junk River. 



Notes from tJae Ley den IMaseuoi, "Vol. X. 



