144 TllK NAUTILUS. 



position of (lie larger groups. This feature is very clearly shown in 

 an excellent " Manual of Zoolog} ," by Richard Hertwig, recently 

 translated by Prof. J. S. Kingsley. " This American edition is not 

 an exact translation. Witii the consent of the author, the whole text 

 has been edited and modified in places to accord with American 

 usage." 



The Mollusca (Phylum VI) are divided into five classes, of which 

 the Ainphineura, including two subclasses, Placophora (Chitons) and 

 ApJacophora are considered the most primitive. Class II comprises 

 Acephaltt or Pelecypoda, in which the views of Pelseneer are closely 

 followed. The order Protuchonchice includes most of the families 

 grouped by Dr. Dall under Prionodesmacea, except the Naiodse, which, 

 with the remainder of the families, are placed in the order Hetero- 

 conchise. The Nuculidse a re considered the most primitive, while the 

 more highly specialized families, like the Teredidtz and Gastrochse- 

 nidse, are placed at the other extreme. Scaphopoda (Class III) are 

 placed between the Pelecypoda and Gasteropoda; the latter being 

 divided into three orders : Prosobranchia, Opist/tobranc/tia and Pul- 

 monuta. The Prosobnmchs are divided into two suborders: Aspido- 

 branchia of which the Docoylossa ( Limpets) are the most primitive 

 andthe Pectinibranchia. Heteropoda " in all details of gills, genitalia, 

 heart and nervous system are true Pectinibranchi, but from an ex- 

 clusively pelagic life have acquired peculiar modifications." The 

 Opisthobranchia consists of three suborders : Tectibranchia, Ptero- 

 poda " pelagic forms which in most points of structure agree with 

 the Tectibranchi" and Nudibranchia. Class V comprises the Cepha- 

 lopoda. C. W. J. 



The junior editor of the NAUTILUS has been appointed Curator of 

 the Boston Society of Natural History, Boston, Mass. This will be 

 his future address. 



ERRATA In the article " Notes on Pyramidula elrodi Pils." in 



the February NAUTILUS, McDonald Lake of the Mission Mountains 

 should be read instead of Post Lake. There are two McDonald 

 Lakes in Montana, and the authorities seem to think the same name 

 for two lakes within a hundred miles of each other must stand. 

 M. J. EL ROD. 



