OYI'RjEA. 



lindrica, punctis albis minutis creberriine adspersa, extre- 

 mitatibus obtusis declivibus; dorso fulvo castaneoque nebu- 

 lato, et quadratim maculato ; lateribus fulvis maculis magnis 

 rotundis ornata, basi incarnato-fulva ; spira, elevata, obtusa, 

 producta ; apertura angusta,, rectiuscula ; dentibus nuinerosis, 

 albis. 



Note. — The white chalky specks, which characterize this 

 shell, are imbedded in its latest layers of enamel. 



2. Argus, Linn., (f. 14, 15). — C. testa, cylindracea, crassa, 

 medio leviter contracto, versus terminos declivi, dorso fulva 

 griseo fasciata, annulis castaneis interdum duplicatis valde 

 inaequalibus notata ; spira depressa, basi angustata, maculis 

 quaternis magnis castaneis ornata ; apertura rectiuscula ; den- 

 tibus elongatis, linearibus, castaneo marginatis. 



Note. — The curious rings, duplicate, triplicate, or simple, 

 very large and few, or very small and numerous, or here and 

 there large, surrounded by small, which characterize this 

 species, and the four basal spots, — make this one of the most 

 remarkable in the genus. 



3. cervus, Linn., (f. 89*, 90*, 181). — C. testa elongato-sub- 

 cylindrica, fusca, obscure fasciata, maculis albis rotundis nu- 

 merosis parviusculis supra et infra ornata ; dorso inflate vel 

 subdepresso, ambulacro angusto subsinuoso ; spira, producta, 

 late sinuata, extremitate antica sinuosa, nonnunquam latera- 

 liter in lobas concavas expansa ; apertura ampla, moderate 

 sinuata, intus piu'pm'ea ; dentibus numerosis, linearibus, cas- 

 taneis, elongatis, canalibus profundis ; labii termino postico, 

 columellam superante. 



4. exanthema, Linn., (f. 182, 183, 184, 330).— C. testa 

 C. cervo affini, quacunque forma, sed maculis albis majori- 

 bus et ocellatis. 



Note. — Cervus, exanthema. In the series of shells in- 

 cluded under the above names, there are two prevailing 

 forms, namely, the rounded and depressed, and two prevail- 

 ing colour-marks, the small plain white spots, and the gene- 

 rally larger ocellated spots. If these were coincident, i.e. 

 if the flat forms were always associated with ocellated spots, 

 and vice versa, there would be no difficulty in deciding on 

 the distinction of the species, at least for conventional use ; 

 but the characters cross. There are the rounded forms, 

 with small white spots, and also with large ocellated ones 

 at the sides. There are also flattened forms, with both kinds 



