Miscellaneous. 229 



I have lately had an opportunity of verifying my description of 

 the animal of Modiolarca, and find that it exactly agrees with the 

 above character, and that it has a very peculiar-formed foot, most 

 resembling that found in some Arcidce, which caused me to call the 

 genus Modiolarca* . 



The following is a more particular description of the animal of the 

 genus, which must be considered as the type of a peculiar family, 

 called 



M0D10LARCAD.E. 



CrenellidcB, Gray, 1840. 



Genus Modiolarca, Gray, 1840. 



Mantle lobes united. Siphonal apertures two, distinct ; anal mo- 

 derate ; branchial very large, inferior, simple edged ; pedal aperture 

 small, basal, subanterior. Gills four, thick, dependent, subtrigonal, 

 truncated in front, narrow, produced and united together behind. 

 Lips four, moderate. Palpi obsolete. Foot oblong, base truncated, 

 lower end lanceolate, acute in front, with a subposterior, central cavity 

 for the byssus. 



Shell equivalve, oblong, thin ; umbo subanterior. Hinge-teeth 

 none, or rudimentary. Cartilage linear, external. Periostraca 

 polished, hard. 



The animal lives attached to floating sea-weed. 



Modiolarca trapezina\^Modiola trapezina, Lamk. Hist. A. s. V. 

 n. 17. ed. 2. vii. 24 ; Delessert, Icon. t. 13. fig. 7; Hanley, Cat. Re- 

 cent Shells, 237. 



MISCELLANEOUS. 



MONSTROSITY OF ANTIRRHINUM MAJUS. 



In a garden at Brixton I observed many spikes of the common 

 Snapdragon, Antirrhinum majiis, with larger and much brighter- 

 coloured flowers than the rest. The flowers were divided to the 

 base into five separate lobes, the upper lip of the common form of 

 the flower being formed of two, the lower lip of three ; the upper 

 lobes were inequilateral, the upper side very straight, and the outer 

 one curved wath an enlarged end somewhat like the wing of a papi- 

 lionaceous flower, and they were one-coloured and slightly twisted ; 

 the three lower lobes were equilateral, lanceolate, variously con- 



* Two genera have been made out of this word. Dr. Beck when in this 

 country made a note that I had called the genns Modiolarca ; bnt he appeared to 

 have read it Modiolaria, and that name has been used for it. The latter name 

 is now chiefly used for the more oblong Crenelles. 



t Since the above was read, I find that M. Valenciennes has considered this shell 

 as the type of a new genus, PhascoUcama (see Gay's Chili, 1854); and Mr. Gould 

 has, more lately, formed a genus for it, under the name of Gaimarda. — J. E. Gray. 



