130 TIIK NAUTILUS. 



to become encrusted with the red nullipore — Lithothamnion poly- 

 morphum — broken bottles, bones, broken china, and similar refuse 

 forming good hiding-places for many shells. The Chitons mentioned 

 above, and the Solariella obscura (Couth.), also the pretty Margarites 

 groznlandica (Gmelin) and the Margarites cinerea (Couth.) are found 

 at this spot. The past year has seen a renewal of the industry of 

 dredging the great scallops Pecten magellanicus (Gmelin). Many 

 natives have fitted good-sized sailboats with power, and with power- 

 dories and large, chain-meshed dredges have given the bottom of the 

 Bay a good scraping. This industry has paid well for a while, but 

 the increasing number of boats devoted to this work is beginning to 

 tell on the supply, and it is bound to give out shortly. 



SHELLS OF GRANT, VALENCIA CO., NEW MEXICO. 



BY II. A. PILSBRY. 



During a brief stop at this place, which is on the Santa Fe Pacific 

 R. R., near the western boundary of New Mexico, above the middle 

 of the Territory, Messrs. Albert and Joshua Baily, Jr., of this city, 

 collected a series of shells, including several forms of considerable 

 interest. The specimens of Lymnsea bulimoides are a very globose 

 and short-spired variety, which I have before received from Prof. 

 Cockerell and others. It will be described as var. cockerelli in a 

 paper on Southwestern Mollusca now about to be published. 



Valvata humeralis is a Mexican species, new to the fauna of the 

 United States, and its occurrence so far north of the Mexican bound- 

 ary leads us to expect it in suitable places over a considerable terri- 

 tory within our limits. It is quite unlike V. virens of the Rocky 

 Mountain region, having more in common with the northern V. sin- 

 cera Say. The list follows : 



Zonitoides arborea (Say). Bifidaria pellucida hordeacella 



Z. minuscula (Binn.). (Pils.). 



Pyramidula striatella (Anth.). Vertigo ovata (Say). 



Helicodiscus parallelus (Say). V- coloradoensis arizonensis 



Yullonia gracilicosta (Reinh.). (Pils. & Van.). 



V. cyclophorella (Anc). Cochlicopa lubrica (Miill.). 



Pupoid.es marginatus (Say). iSuccinea grosvenori (Lea). 



P. hordaceus (Gabb.). Lymncea bulimoides cocJcerelli 



Papilla muscorum (L.). (Pils.). 



P. blandi (Morse). Planorbis parvus (Say). 



P. syngenes dextroversa (Pils. Physasp. undet., not adult. 



& Van.). Valvata humeralis (Say). 



