328 JOURNAL OF CONCHOLOGY, VOL. 10, NO. tl, JULY, I903. 



doubt, covered with a thick dark epidermis Hke the other species of 

 the genus. M. wrightU differs from M. kellettii^ which it most 

 resembles, in being larger and more solid, and in its short spire and 

 trigonal form, 



'The genus Macron has hitherto been considered a subgenus of 

 Pseudolivci, but having recently seen the operculum of M. kelletfii, 

 which is unguiculate, while that of F. Icevis (the type of Pseudolivd) 

 is purpuroid, Macron must be separated and take rank as a genus.' 

 (H. Adams.) 



3A. Macron stereoglypta. 

 Pseudoliva {Macron) stereoglypta Sowb., Proc. Zool. Soc, 1882, p. 119.^ 



'Shell angularly ovate, ponderous, white; spire rather short, turretted ; 

 whorls 5, convex, rounded at the angle, depressed at the suture, with 

 a prominent ridge between the suture and the angle; the last whorl 

 has the upper angle somewhat rounded, and a second equally rounded 

 angle a little below, sides slightly convex, with three rather broad deep 

 grooves near the base; umbilical ridge thick and broad. Aperture 

 oblong-oval, smooth, white within. Lip very thick at the upper part. 

 Columella furnished with a callosity, which is thickened into a tubercle 

 at the upper part and depressed so as to cover the umbilicus at the 

 lower. Length 75, width 51 mm. Length of aperture 43, width 

 21 mm. 



'The specimen is, unfortunately, in bad condition, the outer surface 

 being much worn and the lip imperfect; but it is certainly worthy of 

 notice, being the largest species of a very limited genus, and of a bold 

 and striking outline, entirely different from the two largest species 

 hitherto known; /'. keHeltii and P. cethiops. 



•I have not attempted to describe the surface of the shell, on 

 account of its condition, but there are faint indications of obsolete 

 sulci, with a sort of malleation between.' (G.B.S.) 



Now it will be 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 to- 

 gether 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 wrlghtii^ 

 must smk into synonymy. In locality, indeed, there is alone a 

 discrepancy. On the authority of the late Mr. Bryce M. Wright 

 Patagonia is given for M. tvrightii, while California is credited as the 

 birth place of Af. stereoglypta. In all probability this latter is correct; 



I G. B. SowerVjy, jr., " Desciiptioiis of new shells in the Collection of J. Cosmo Melvill," 

 Proc, Zool. Soc.f 1SS2, p. 117-121, 



