186 SHELLS OF LOWER CALTFOnXIA— STEARNS. vol.xvii. 



This last was collected by the late A. J. Grayson, tlie well known 

 ornitholoaist. 



PURPURA COLUMELLARIS, Lamarck. 



Many examples. Tres Marias (No. 32142, IT. S. N. M.). 



Very heavy solid specimens, of a dwarfed habit and rather elevated 

 spire, of a total length of from only 1.03 to 1.05 inches, were collected 

 at these islands, being about one-half of the size of usual adult examples, 

 which measure long, .2 inches or over. 



A variety intermediate between columellaris and xjutula is sometimes 

 met with (No. 32143, U. S. N. M.). It is not so heavy or solid as the 

 former and heavier than i)atula, with the protuberance on the columella 

 less conspicuous than is usual in columellaris. 



PURPURA KIOSQUIFORMIS, Duclos. 

 = €uma Mosquiformis, Duclos aud of authors. 

 One exceedingly fine specimen. Boca de los Piedras (No. (50005, U. 

 S. N. M.). 



The shells from the Gulf region compared with Panama examples 

 appear to have a more regular growth; the x)ointed knobs are less pro- 

 duced, aud the adults, average, of larger size. Henry Edwards collected 

 some very fine specimens at Mazatlan, while at that place several years 

 ago collecting insects; examples of these he kindly contributed to my 

 collection. 



PURPURA HIPPOCASTANEUM, Linn n- w s . 



One specimen living.* Mulege Bay (No. 89655, U. S. N. M.). 



The black-mouthed variety generally known as /*. hituhercnlaris La- 

 marck. 



Au Indo-Pacific species. How came it here? 



The occurrence of Cassis vihex on the Tres Marias, beach, and subse- 

 quent detection at La Paz (crab shells), has led me to include the above 

 Polynesian pur^iuroid in Fisher's list. Its occurrence here may be 

 accideutal. 



PURPURA BISERIALIS, B 1 a i n v i 1 1 e . 



Numerous examples. Loreto, Gabb. Ballenas Bay ; Sta. Margarita 

 Island, Albatross. 



The Santa Margarita specimens include both the coarsely-sculptured 

 form and the variety, wherein the principal transverse ridges are hardly 

 broken into knobs. This species seems to be very abundant at this 

 place, and exliibits all the varieties to which Carpenter has referred in 

 his Mazatlan Mollusca. 



PURPURA TRISERIALIS, B 1 a i u v i 1 1 e . 

 Four examples. 



* Previously noted by me in Proc. U. S. Nat. Museum, Vol. xvi, 1893, p. 347. 



