98 THE NAUTILUS. 



Planorhis campanulatus 15 examined; 3 with cercariae, 12 

 without. 



Galba catascopium 10 examined; 6 witli sporocysts and cer- 

 cariae, 4 without. 



Galba cmargimita 5 examined; 3 with cercariae, 2 without. 



Campelomu integrum 3 examined ; 2 with cercariae, 1 

 without. 



Physa warreniana 9 examined; 3 with cercariae, 6 without. 

 Small leech in mantle cavity of 3 specimens. 



Ganiohasis livescens 2 examined ; 1 with cercariae, 1 without. 

 University of Illinois, 

 Museum of Natural History. 



TYPES OF GENEEIC NAMES PHOPOSED FOR ACHATINAE. 



BY H. A. PILSBRY. 



When working on Congo Valley mollusks I noticed that 

 while the generic names applied to the Achatinae were discussed 

 in INIanual of Conchology, vol. xvi, genotA'pes were not selected 

 for some names there considered absolute synonyms. This lack 

 is supplied in the following list. Where a type had already 

 been selected the authority and date of selection are added in 

 parentheses. 



AchatinaLnm., 1799, tyTpe Bulla achatina L. (Lam., 1799). 



Ampulla Bolten, 1798, type A. priamus Bolt. (Pilsbry, 1908). 



Chersina [Humphrey], 1797, type Bulla achatina.^ 



Achatium Link, 1807, type A. elegans Link = A. achatina (L. ) . 



Achatinus Montfort, 1810, type A. zebra (Montfort, 1810).' 



' The MuReum Calonnianum has been rejected as a source of nomenclature 

 by the International Commission. 



* De Montfort appears to have confused A. zebra and A. panthera under the 

 former name, but as he stated that Achatinus zebra is the type, the name be- 

 longs rather to Coehliioma than to Achatina. Since he says that Lamarck 

 founded the genus, it is evident that he intended Achatinus merely as an 

 emendation o( Achatina Lam., and not as a new name. It cannot therefore 

 displace Cochlitoma, but will be regarded merely as a variation in orthography. 



