408 | 
mis rather thin, conspicuous, adherent, of a horny olivaceous 
colour. Long. 52, long. spir. ‘32, lat. °63, div. 90°. 
Hab.—Mazatlan ; 5 sp. very ia P’pool Col. a other 
localities, v. supra.) 
Tablet 1949 contains the most characteristic specimen. 
485. Torinta PaRaNosa, Val. 
Solarium granosum, Val. Rec. Obs. vol. ii. p. 269. Described 
as the living analogue of the Italian fossil, 8. milligranum. 
Comp. Solarium fenestratum, Hinds. 
Tablet 1950 contains a fragment of the base of a very distinct 
species. It is flat, with numerous strongly granular spiral 
rows, and deeply cut broad interstices. 
Hab.—<Acapulco, Humboldt & Bonpland.—? Mazatlan ; ex- 
tremely rare, off Spondylus; Z’pool Col. 
Famity PYRAMIDELLID. 
This family, the smaller forms of which are so abundant in 
our own seas that Clark speaks of it as a ‘‘truly British group, 
which far outnumbers the discoveries of any other country,” 
is probably well represented in most places, but has escaped 
attention in consequence of the minuteness of most of its 
members. While the assiduous and almost exhaustive labours 
of British malacologists have eliminated 44 species, of which 
Clark regards 20 as spurious, the mere refuse from a few 
Mazatlan shells has displayed forms which have required the 
enumeration of 72 species to contain them. All the sectional 
forms described from our own seas are here represented, with 
the addition of some not hitherto distinguished. While rich 
in species however, the materials at our “command were very 
sparing in specimens, only one (Chrysallida communis, C. B. 
Ad.), which appears to be littoral in its habits, being at all 
common. Next to this ranks Chr. ovulum, then Eulima ?dis- 
torta. What must be the richness of the ocean bed itself, if so 
many have left traces of their existence on the backs of a few 
oysters ! 
The generic distinctions in this family, asin Helicide and 
Veneride, are confessedly of little value. Links are found 
which unite all that have been yet proposed. When however 
