32 CLASS III. GASTEROPODA. ORDER III. CERVICOBRANCHIATA. 
mass to which it adheres, was generally found deposited in parts compa- 
ratively smooth. The edge is finely crenulated, and turned up all round 
like a platter, as if to protect the basal margin of the cap-shaped shell 
which rests within it. Pl. CXLIV. Fig. 5. represents the cap-shaped shell, 
showing the internal laminal appendage ; fig. 7, the shelly plate as depo- 
sited upon a fragment of coral rock ; and fig. 6. exhibits both in situ; the 
shell, which is just raised to show the interior, has another smaller speci- 
men adhering to it. The soft parts of this animal are in the hands of 
Professor Owen, who will now decide whether it should remain with the 
Calyptre, or whether it is entitled to a new generic distinction. The 
fact of Mr. Cuming having met with a second species of it, together with 
the evidence of his never having yet found any other of the Calyptraz 
with a basal plate, strongly leads us to anticipate the latter. Professor 
Owen informs us, that if upon examination he finds such to be the case, 
he proposes to establish a new genus for it under the title of Liruzpapuus ; 
we therefore anxiously wait the result of his dissection. 
The shell of Calyptreea may be described as being conoidal, more or 
less convex superiorly, and sometimes, though rarely, supported upon a 
solid basal plate ; the outside is smooth or striated, sometimes spiny or 
foliated ; the vertex is subcentral and imperforate, and the inside is fur- 
nished with a cup-shaped or spiral appendage. 
Examples. 
Pl. CXLIV. Fig. 1. 
Catyptrma ruGosA, Lesson, Magasin de Zoologie, 1834, Mollusques, 
pl. 2. 
Subgenus Calypeopsis, Lesson. 
Pl. CXLIV. Fig. 2. 
CaLypPTR&A RADIANS, Deshayes, new edit. of Lamarck, vol. vii. p. 626. 
Enc. Méth. pl. 445. f. 3. Schub. and Wagn., Supp. to Chemnitz, 
p. 229. f. 4063 a. and 4064 b. 
Trochus radians, Lamarck. 
