98 THE NAUTILUS. 



Planorbis campanulatus 15 examined; 3 with cercariae, 12 

 without. 



Galba catascopium 10 examined ; 6 with sporocysts and cer- 

 cariae, 4 without. 



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



Campeloma, 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. 



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



University of Illinois, 

 Museum of Natural History. 



TYPES OF GENERIC NAMES PROPOSED 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 Manual of Conchology, vol. xvi, genotypes 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. 



Achatina Lam., 1799, type Bulla achatina L. (Lam., 1799). 



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



Chersina [Humphrey], 1797, type Bulla achatina. 1 



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



Achatinus Montfort, 1810, type A. zebra (Montfort, 1810). 2 



1 The Museum Calonnianum has been rejected as a source of nomenclature 

 by the International Commission. 



2 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 Cochliloma than to Achatina. Since he says that Lamarck 

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

 emendation of A chatina Lam , and not as a new name. It cannot therefore 

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



