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Reference	Citation	Reference available
Adams, H. 1866. Descriptions of a new genus and some new species of Mollusks. Proceedings of the Zoological Society of London. 1865: 753-755. [753]	Cited Original Description Type Designation	request
Sowerby, G. B. (3rd). 1882. Descriptions of new species of shells in the collection of Mr. J. Cosmo Melvill. Proceedings of the Zoological Society of London. 1882(1): 117-121; pl. 5. [119; pl. 5, fig. 8]	Cited Figured Original Description Type Designation	request
Melvill, J. C. 1903. The genera Pseudoliva and Macron. Journal of Conchology. 10(10-11): 320-330; text fig. [327-329]	Cited	request

H. Adams first described this shell in 1866. Unknowingly Sowerby 3rd also described it sixteen years later in 1882. As Adams’ is the earliest available name it takes priority. This NMW specimen is the single shell on which he based his description and is therefore the holotype.

Comments in Melvill, 1903:
“Now it is patent to all who take the trouble to examine the shell of P. stereoglypta Sowb., at present unique in my collection, and at the same time compare the descriptions here given in extenso together of Messrs. H. Adams and Sowerby, that they both apply to the same individual specimen. In all points, e.g., form, colour, size, certain peculiarities of contour, condition of specimen, etc., the two accounts seem almost exactly to correspond, and with little doubt the new recently proposed name, described seventeen years after wrightii, must sink into synonomy. In locality, indeed, there is alone a discrepancy. On the authority of the late Mr. Bryce M. Wright Patagonia is given for M. wrightii, while California is credited as the birth place of M. stereoglypta. In all probability this latter is correct; there are many points of similitude between this heavy, thickly shouldered species and the more elegant M. kellettii.”

Although Melvill indicates that Sowerby lists California as the type locality for stereoglypta no mention of this can be seen in Sowerby, 1882.