80 THE NAUTILUS. 



ing. Thought by von Martens to be probably not distinct from 

 Limax Isevis, in the wide sense. ) 



AGRIOLIMAX Morch, Journ. de Conchyl., 1865, p. 378. L. 

 agrestis here selected as type. 



Since 1865 several additional names have been proposed, 

 some of which have been used for subdivisions, such as Hydro- 

 Umax Malm., for the lasvis group. Of the names given above, 

 it will probably be best to revive LIMACELLA Brard, with the 

 type L. obliqua = L. agrestis. Brard' s name has been discred- 

 ited because he founded a genus upon the shell as distinct from 

 the animal; but after all, he was only following the example of 

 Linn6, who based his genera of testacea wholly upon the shells, 

 prefacing the conchological definition with ' ' animal a Limax. ' ' 

 Brard' s nomenclature was indisputably regular, being on abso- 

 lutely Linnean lines. He left Limax for the slugs without a 

 shell (L. rufus Linn. ) . 



Jousseaume in 1876 (Bull. Soc. Zool. de France I, p. 25), 

 followed by Mabille in the same publication (p. 96), used 

 Limacella for the L. maximus, flavus and agrestit groups, without 

 selecting a type. 



Limacella of Blainville, 1817, was incorrectly defined, but 

 Prof. Cockerell has shown that its type is a Philomycus. Being 

 later than Brard' s Limacella, this use of the name is not admis- 

 sible under the existing rules of nomenclature. 



TETHY8 WILLCOXI IV NEW ENGLAND WATEES. 



BY 8. N. F. 8ANFORD. 



On Oct. 9, 1921, a number of those curious tectibranch mol- 

 lusks known as Sea Hares, Tethys (Aplysia) wiUcoxi (Heilprin), 

 appeared in the West Passage of Narragansett Bay, R. I., com- 

 ing in on the flood of the tide and disappearing with its ebb. 

 As the tide was going out only two specimens were secured by 

 the writer and his companion, Mr. Orville C. Minkler, although 

 several others had been seen during the day. A second trip to 

 the same station, on Oct. 16, yielded two more specimens, but 



