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Show 1893.] NEW SPECIES OF PLEUROTOMID^E. 491 in sculpture it resembles B. lactea, but the spiral ridges are in form it approaches B. jiammea and B. subula. DEFRANCIA INFRACINCTA, n. sp. (Plate XXXVIII. figs. 21, 22.) Testa oblonga, solida, carnea; spira mediocriter elata, ad apicem acuta; anfractus 8, convexi, linea fusca tenuissima ornati, spiraliter lirati, longitudinaliter costati, costis numerosis, rotundatis ; anfractus ultimus vix inflatus, infra medium leviter constrictus, fascia fusca conspicua pictus ; apertura breviuscula labrum extus incrassatum, intus serratum, superne profunde sinuatum, canali brevissimo. Long. 10, maj. diam. 4 millim. Hah. Mauritius. A rather rough shell, with numerous rounded ribs, crossed by close-set raised ridges. The conspicuous band near the base surmounted by a thin brown line seems characteristic. DEFRANCIA MAURITIANA, n. sp. (Plate XXXVIII. figs. 23, 24.) Testa turrita, albida, maculis fuscis promiscuis picta, undique costis numerosis confertis granulatis sculpta ; spira elata, convexa, ad apicem acuta; anfractus 9, gradati, levissime convexi; sutura impressa; anfractus ultimus spiram vix cequans, haud inflatus, rectiusculus, ad basim constrictus; apertura parviuscida, oblonga; labrum crenulatum, incrassatum, superne sinu profunda emarginato, inferne ahrupte constrictum, canali brevissimo. Long. 10, maj. diam. 3 millim. Hab. Mauritius. A conspicuously painted species, with a strongly granulated surface; the constriction of the base is peculiar. CYTHARA GUENTHERI, n. sp. (Plate XXXVIII. figs. 27, 28.) Testa solidiuscula, utrinque acuminata, albida, pcdlide fusco tincta et vittata, postice purpureo tincta ; spira elato-conica, gradata anfractus 10, angulati, undique spiraliter striati, longitudinaliter costati ; anfractus ultimus spiram superans, convex-iusculus, basin versus attenuatus; apertura elongata, angusta; columella levissime curvata, albo-callosa ; labrum extus incrassatum, ad marginem acutum. Long. 25, maj. diam. 11; apertura longa 15, lat. 3 millim. Hab. Holothuria Banks, N . W . Australia, 38 fathoms. A beautiful delicately sculptured shell, hitherto without name, in the British Museum Collection. CYTHARA RINGENS, n. sp. (Plate XXXVIII. figs. 29, 30.) Testa abbreviata, angulata, utrinque acuminata, alba; spira conica, ad apicem acuta ; anfractus 7, angulati, longitudinaliter costati, spiraliter subtilissime striati; sutura anguste canali-culata; anfractus ultimus spiram superans, angulatus, supra angulum leviter concavus, deinde vix convexus, basin versus |