ASPIDOBRANCHIA. FISSURELLAD. ANS 
Patella greeca, Lister Conch. t. ececexxvi. f. 1, 2; Penn. Brit. 
Zool. iv. 144. t. Ixxxix. f. 153; Pult. Cat. Dorset. 52. t. 
xxiii. f. 3; Mont. Test. Brit. 492; M.& R. Trans. Linn. 
Soc. vill. 236; Flem. Edinb. Encyel. vu. 69; Dill. Desc. 
Cat. 822; Turt. Conch. Dict. 141. 
Larva reticulata, Da Costa, Brit. Conch. t. 1. f. 3? 
Patella reticulata, Donov. Brit. Shells, t. xxi. f. 3. 
Fissurella greeca, Lam. Hist. Nat. des Anim. sans Vert. vi. 11. 
Habitat in mari Atlantico, Mediterraneo et Adriatico vulgatis- 
simé. Long. 3. Alt. 3 unc. 
Shell ribbed from its apex to its base; the ribs sculptured 
with circular elevated lines, forming a cancellated surface. 
Length half an inch; height a quarter of an inch. 
This species is very common; it inhabits the Atlantic, Me- 
diterranean and Adriatic seas. 
Genus 98. CeMoRIA. 
Testa conico-elevata, ante verticem perforata. Vertex recur- 
vus ; interné processu cavo, tenui, instructo, anticé directo. 
Animal incognitum. 
Shell conically elevated, perforated before the vertex. Ver- 
tex recurved; furnished internally with a thin, hollow, pro- 
jecting process. 
Animal unknown. 
This genus is distinguished from Fussurella by the project- 
ing process within the shell under its aperture. 
1. Cemorta Montacuana. Tab. X. fig. 6. 
C. testa ab apice ad basim costati, costis latis, lineis circula- 
ribus reticulatis. 
Patella apertura, Mont. Test. Brit. 491. t. xii. f. 11 (figura 
pessima); M. §& R. Trans. Linn. Soc. vii. 236; Flem. Edinb. 
Encycl. vi. 69 ; Dill. Desc. Cat. ; Turt. Conch. Dict. 141. 
Habitat in Danmonie et Cornubiz Australis mari rarissime. 
Mus. Montagu in Mus. Brit. Alt. 3. Long. { unc. 
Shell ribbed from the apex to the base. Ribs wide and 
