THE NAUTILUS. 27 



On Cerlros the dogs have entirely cleared out a rare dwarf species 

 of deer which formerly lived here. On Todos Santos the common 

 rat has in the last few years made life so strenuous for the sea birds 

 that they have given up nesting here entirely. Since birds' eggs 

 have been cut out of the rat's bill-of-fare, they have developed a 

 fondness for snails and I fear in a year or two Todos Santos will be 

 as destitute of snails as it is of birds' eggs. 



San Geronimo Island is smaller than San Martin, only about one 

 and a half miles in length and as bare as a picked hen. It's barren 

 sandy soil seems incapable of supporting any vegetation save a feu- 

 stunted bushes. Only very dead specimens of Helix levis var. near 

 crassula Dall were obtainable, though I made a thorough and 

 systematic search for them. The reefs on the west side yielded a 

 number of good small species. 



Margaritas acuticostatus Cpr. Eulima bitorta Van. 



Mitromorpha gracilior Hemphill. Modiolus opifex Say. 



Truncatella stimpsoni Stearns Milneria minima Dall. 



Area gradata Brod. & Sby. Cardita subquadrata Cpr. 



Mitra lowei Dall. Columbella penicillata Cpr. 



Marginella varia. Fusus luteopictus Dall. 



Marginella politula Cooper. Lucina californica Conr. 



Triforis pedroana B. Hipponyx antiquatus Linn. 



Bittium attenuatum Cpr. Gadinia reticulata Sby. 



Bittium munitum munitoides B. Opalia crenatoides Cpr. 



Cerithiopsis alcima B. Ocinebra gracillima Stearns. 



Cerithiopsis pedroana B. Pecten latiauritus Cpr. 



Cerithiopsis carpenter! B. Acmaea asmi Midd. 



Turbonilla buttoni D. & B. Mitromorpha filosa Gabb. 



Odostomia helga D. & B. 



On San Ger6nimo we found Acmcsa persona Esch and var. digi- 

 talis, also a form of A. spectrum which seemed to be copying the 

 peculiar shape of A. persona, Acrncea scabra, A. pelta var. nacel- 

 loides and Lottia gigantea Gray were also found on the reef's. 



The Tegula gallina were the largest I have ever seen. 



We left San Gerdnimo Island rather hurriedly the evening of the 

 second day as a southeaster was coming up. Next morning found 

 us at the north end of Cedros Island where the Esperanza Mining 

 Company had their wharf and buildings for shipping the gold ore 

 from their mines in the interior of the island. There were prac- 



