192 VINCULARID&. 
L. ventricosa, Hassall; Busk, l.c., p. 78; Johnston, lc, p. 305. 
Cells distinct above, or raised, immersed at the base, ventricose, ovate 
or sub-globose ; mouth sub-orbicular, with a thickened raised margin ; a 
bifid denticl2 on the lower lip, and four (rarely more) marginal spines ; 
surface granular or irregularly striated; usually a pointed or broad 
mucro in front of the mouth; ovicells globular, prominent. 
Lyall Bay. Britain. 
L. urceolata, Hutton, CMM, p~. 97. Cells large (04 inch), 
ovate, ventricose, immersed behind ; surface finely granular without any 
pores; mouth simple, scarcely thickened, sub-orbicular, lower lip 
straight ; from four to seven spines on the upper margin. 
On dead shells. 
L. cancer,. Hutton, CALM. ~. 97. Cells ovate, sub-immersed, 
separated by depressed lines ; surface coarsely granular ;_ lower lip pro- 
duced into a mucronate hollowed process, which covers the mouth, and 
is transversely striated ; a short blunt incurved spine on each side of the 
mouth; in the fertile cells the lower lip is not mucronate but rounded, 
and the spines are absent ; ovicells globose, coarsely granular. 
Lyall Bay. On Fwcz. 
L. pellucida, Mutton, CALM, p. 97. Cells ovato-ventricose, 
smooth, thin, translucent, a pore in the centre; mouth nearly terminal, 
oblong, transverse, with four or five long spines on its upper margin ; 
ovicell (?). On Fuct. ; 
(o.) Mouth without spines. 
L. pertusa, Busk, .c., p. 80; Johnston, Lc., p. 311. Cells ovato- 
ventricose, or rhomboid, immersed, separated by a raised line, punctured ; 
mouth orbicula,or narrowed below,and with a small tooth on each side; 
margin scarcely thickened, unarmed ; usually with an irregular perforated 
tubercle below the mouth ; ovicell globose, punctured ; purple. 
Britain. Australia (?). 
On dead shells and corals. 
L. areolata, Bush, l.c., p. 82. Cells sub-ovate or diamond-shaped, 
depressed, quite immersed, quincunicial, outlines marked by raised 
lines ; surface granular ; mouth sub-orbicular, with a sinus below and a 
raised thickened margin. 
Straits of Magellan, to to 20 fathoms. 
L. malusii, Busk, 1c, p. 83; L. biforis, Johnston, Lc, p. 314. 
Cells ovate, frequently truncate at each end; front, especially round the 
margin, punctured with numerous stelliform pores; a central lunate 
pore; mouth rounded, above, straight below, sometimes armed with 
three to four oral spines, sometimes forked ; ovicells smooth, sometimes 
porcellanous, grooved round the upper border, adnate to the front of 
the cell above. 
Britain. South America. Falkland Islands. 
