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“Vulsella spongarium. Vul. testâ oblongâ, arcuatâ, ad basin latiusculâ, umbonibus divergentibus, radiatim minutissimè crenulato-squamatâ; fuscenscente.
THE SPONGE VULSELLA. Shell oblong, arched, rather broad at the base, umbones diverging, radiately very minutely crenulately scaled; light-brown.
LAMARCK, Anim. san vert. vol. vii. p. 268.
Although it is a generic character of the Vulsellæ to have the umbones diverge from each other with advancing growth, they appear to be more than usually divergent in this species.”