(J1RRIPEDA. 
473 
jaws, and provided with four hairy palpi-like appendages. — Shell 
sessile, conical, composed of four valves, locked together, closed 
at the base by a testaceous plate ; aperture subtrigonal or ellipti¬ 
cal *, operculum internal, and consisting of four moveable valves. 
Balanus candidus .— The White Balanus. 
Plate XCII. fig. 10 and 11. 
White; valves nearly smooth; operculum strongly ridged 
transversely with longitudinal, nearly obsolete strite. Two 
inches broad at the base. Inhabits the Frith of Forth. 
Genus 6. — COR ON ULA. — Lamarck. 
Generic Character. — Body seated, enveloped in a shell, with 
small setaceous and cirrous arms. — Shell sessile, suborbicular; 
valves apparently indivisible, conoid, or conically truncated at the 
extremities, with very thick walls, and interiorly hollowed in 
radiating cells ; operculum having four obtuse valves. 
Coronula diadema .— The Crown Coronula. 
Plate XCII. fig. 12. 
Somewhat compressed, with six prominent longitudinally rib¬ 
bed valves ; alternating with as many depressed transversely 
striated ones. Found attached to the skin of whales in the 
North seas. 
Genus 7.—TUBI GIN ELLA. — Lamarck. 
Generic Character .—Body inclosed in a shell, with small 
setaceous and unequal cirri.—Shell univalve, tubular, straight, 
and somewhat narrowed towards the base; surrounded with 
nearly equidistant transverse ribs ; truncated at both ends, open 
at the top, and provided with a bottle-shaped operculum ; con¬ 
sisting of four valves ; base closed by a membrane. 
Tubicinella balccnarum —The Whale Tubicinella. 
Plate XCII. fig. 13. 
Tubular, with transverse ribs, and a ring-shaped margin ; oper¬ 
culum bottle-shaped. Found adhering to the skin of whales in 
the South American seas. 
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