FAMILY 12. CONVOLUTA. 261 
Pl. CCLXXXV. Fig. 5 and 6. 
Erato racuryma, Gray. Sowerby, Catalogue of Cypreade, p. 15. No. 5. 
Conchological Illustrations, f. 48. 
Lachryma trifasciata, Humphrey, MSS. 
Pl. CCLXXXV. Fig. 7 and 10. 
Eraro scapriuscuta, Gray. Sowerby, Catalogue of Cypreade, p. 15. 
No.1. Conchological Ilustrations, f. 45. 
Marginella cypreola, Sowerby. 
Marginella granum, Kiener. 
Pl. CCLXXXV. Fig. 8 and 9. 
Erato euttuta, Sowerby, Catalogue of Cypreade, p.16. No. 6. Con- 
chological Illustrations, f. 50. 
CYPRAA, Linneus. 
Testa ovata, vel oblongo-ovata, ventricosa, interdum polita, interdum 
nodifera, aut costellata, extremitatibus canaliferis, aut emarginatis ; 
spira brevissima, partim vel omnind occulta; apertura centrali, 
longitudinali, angusta; columella labroque per totam longitudi- 
nem plus minusve denticulatis, interdum at rard edentulis. 
This favoured genus of mollusks is one of the very few adopted by 
Linnzus that remains entire ; attempts have been made, it is true, to sub- 
divide it both by De Montford and Gray, but the subdivisions of those 
ingenious writers have signally failed to be recognised. The harmony 
of character, as well as the constant similarity of form which the shells 
of these mollusks assume in the adult state, renders them at all times 
easy to be distinguished ; there is, however, some little difficulty in identi- 
fying them in an early stage of growth. Great interest is found in the study 
of these animals in observing the gradual increase and development of the 
WO. i 2m 
