36 THE NAUTILUS. 



PRELIMINARY DESCRIPTIONS OP NEW SPECIES OP PULMONATA 

 OP THE GALAPAGOS ISLANDS. By W. H. Dall. Proc. Calif. 

 Acad. Sci., 4 ser., vol. ii, pt. 1, pp. 375-382, Dec. 1917 (re- 

 ceived May 17, 1918). Thirteen new species of Bulimuliis 

 subgenus Naesiotus, a new Helicina and Williamia galapa- 

 gwui are described. 



NOTE ON CHRYSODOMUS AND OTHER MOLLUSKS FROM THE 

 NORTH PACIFIC OCEAN. By W. H. Dall. Proc. U. S. Nat. 

 Mus., vol. 54, pp. 207-234, 1918. An exhaustive account of 

 the genus and the allied forms now grouped under the family 

 Chrysodomidse. The nuclei or larval shells of the various 

 genera present several distinct types and numerous mutations. 

 "In many cases, as in Buccinum and Busy con, it was shown 

 many years ago by Loven and others that a single ovicapsule 

 contains a number of ova fertile and unfertile. The unfer- 

 tile eggs serve as food for the larvas developed from the fertile 

 ones and there is a certain amount of competition between 

 the larvae in the capsule which results in the most vigorous 

 larvse getting more food and making a larger growth than the 

 more weakly coinhabitants of the capsule. Thus at the time 

 of leaving the capsule and coming into the outer world, it 

 sometimes happens that there will be perceptible differences 

 between the individuals issuing from a single capsule, not 

 only in actual size but in the length of the coil of whorls and 

 the size and compactness of the larval apex." The rules of 

 nomenclature necessitates the use of Chrysodomus instead of 

 Neptunea. Under the genus Searlesia is placed the C. diru-s 

 of the west coast. The other genera comprising the family 

 are : Ecphora, Colu-s, Siphonorbis, Kryptos, Plicifusus, Exilia, 

 Valuiopsius, Pyrulofusus, Beringvus, Liomesus and Ancistro- 

 lepis. Fifteen new species are described. C. W. J. 



NOTES ON THE NOMENCLATURE OF THE MOLLUSKS OP THE 

 FAMILY TURRITID^E. By W. H. Dall. Proc. U. S. Nat. Mus., 

 vol. 54, pp. 313-333, 1918. A very useful and timely paper. 



