30 CYPRMA. 



dracea, depressa, basi coniplanata, lateribus punctatis, extre- 

 mitatibus obtusis latis macula conspicua utrinque ornatis; 

 dorso roseo vel griseo, seriatim flammnlis undulatis nebu- 

 lato, punctis miuutissimis asperso ; apertura recta, lata, cana- 

 libus latis baud profundis ; labio vix incurve- ; dentibus tenui- 

 bus, subelongatis ; columella ad terminos callosa ; dentibus 

 medianis minoribus. 



100. microdon, Gray, (f. 385, 386). — C. testa G. fimbriates 

 affini, sed subpyriformi, extremitatibus acuminatis ; apertura 

 angustiori, rectiuscula; dentibus miuutissimis. 



Note. — Punctulata, pallida, macula, fimbriata, microdon. 

 There are cyprasologists who claim to trace an unbroken 

 line of gradation through varieties from the first to the last 

 of these ; but I have generally thought I could discover a 

 good break here and there in the most carefully-selected 

 series. The manner in which the lateral deposits are spread 

 over the back in punctulata places it, in fact, much nearer 

 the Arabica, group than to pallida. Macula is intermediate 

 between pallida and fimbriata. It is less pyriform than the 

 former, and more so than the latter; the extremities are 

 less produced, and less really reflected ; the aperture much 

 less curved posteriorly, and the base more flattened than in 

 pallida, and the converse in every case with regard to fim- 

 briata. The latter is remarkable for wideness and straight- 

 ness of aperture, and broad openness of extremities, while 

 microdon, which at first sight resembles the small, pinky, 

 purple-tipped form of fimbriata, is narrower, has the ends 

 produced and contracted, the mouth narrow and sinuous, 

 and the teeth very small. 



101. angustata, Ghnel. (f. 296, 297). — C. testa pyriformi, 

 ventricosa, tenuiuscula; basialbida, subcomplanata; lateribus 

 conspicue punctis magnis confusis pictaj apertura latius- 

 cula, postice recurva; labio retrorso, elevato, postice co- 

 lumellam superante ; dorso elevato ; lateribus declivibus, si- 

 nistra emarginato, latere dextro angustatim marginato, punc- 

 tato, medio saturate fusco-purpurascente ; extremitatibus 

 obtusiusculis ; dentibus numerosis, tenuibus. 



Var. testa pallide fulva, immaculata, vel flammulis aurantiis 

 in seriebus tribus picta. (F. 289.) 



102. Comptoni, Gray, (f. 292-295).— C. testa G. angus- 

 tatce affini, sed marginibus dorso concavo-depressis ; basi 

 obscure fusco ; labio postice elevatim angulato, infra angu- 

 lum depresso. 



