170 AMERICAK JOURNAL 



Conr., appear as the "3/. punctata, Gray." It is highly im- 

 probable that luguhre occurs on the cqast of Peru. In the large 

 collection made by the late Thomas Bridges, upon the South 

 American coast, it was not found, and is not mentioned in the 

 Panama Catalogue by Prof. C. B. Adams ; Kiener's " Peru " is 

 undoubtedly an error. 



The next species in order is the Monoceros muricatum, Rve., 

 which is the Purpura murieata, Gray ; it is also enumerated 

 under the latter name as a Purpura, in Smithsonian check list, 

 by Dr. Carpenter, who refers to it in his Mazatlan Cat., p. 476, 

 as follows. "This shell rests its claim to a place in the genus 

 Monoceros on a projecting wave in the labrum, between the 

 canal and the first costal depression." The finely developed 

 specimens in my own collection, as well as many that I have 

 seen elsewhere, justify me in supporting the " claim " of this 

 shell "to a place in the genus Monoceros,'' as the claim is well 

 founded ; the "projecting wave," to quote Dr. Carpenter, is in 

 my specimens developed into a horn of sufficient prominence to 

 enable the shell to enter the genus 3Ionoceros on its own hook. 

 I will state that, in many huge specimens that have come under 

 my observation, the horn can hardly be considered as anything 

 more than a " projecting wave." Individuals of the same species, 

 and in all of the species, vary exceedingly in this respect. 



J\r. muricatum, though not a rare shell, is not common. In the 

 Reigen collection it is reported as rare at Mazatlan ; I have re- 

 ceived many specimens at various times from different parties, 

 generally immature, however, and their exact habitat, or that 

 of the finely developed specimens above mentioned, I am unable 

 to give. It was collected by Major William Rich, in Loweir 

 California, and in the collection made by Lieut. T. P. Green t 

 is reported from San Juan, which is no doubt correct, though t'^e 

 small collection made there by Prof. Gabb did not contain it. 

 This species appears in collections named as Purpura or M. mu- 

 rieata^ muricatum and tuherculatum. 



In Adams' genera it is catalogued as " M. tuherculata. Gray ;" 

 there is a good picture of it in Sby's. Conch. Illustr., fig. 9, and 

 in Chenu's "Manuel," on p. 169, fig. 828, ami M. tuberculatum 

 fig. 831. 



In the Mazatlan Cat., on the authority of Cuming, one habitat 

 is given as " St, Elena," which is on the coast of Guayaquil, 

 latitude about 2° south, but no mention is made of it in Prof. 

 Adams' Panama shells, and I did not find it in the Bridges' col- 

 lection. There is a long reach of coast extending from Aca- 

 pulco to Panama which is, following the bends and curves of the 

 shore line, not less than fourteen hundred miles in length , of 



