. Annals and magazine of natural history : including zoology, botany and geology. 464 Ml-. J. Alder on JefFreysia and Chemnitzia. sub basi vibraculorum recondenda, involvenda; evoluta cer- vicem latitudine vix cedens, longitudine pedem jequans 1. su- perans, teres, versus apicem sensim attenuata, ore apicali minuto (edentulo ?). Mentum elevatuuij a solea discretum, facie superne latiore, suifulcro angustiore solese adnatum, antrorsum declive, soleje marginem anticum vix attingens, antice latius, rotundatum 1. bilobum, Isete ; To remove, however, any further doubts upon the subject
. Annals and magazine of natural history : including zoology, botany and geology. 464 Ml-. J. Alder on JefFreysia and Chemnitzia. sub basi vibraculorum recondenda, involvenda; evoluta cer- vicem latitudine vix cedens, longitudine pedem jequans 1. su- perans, teres, versus apicem sensim attenuata, ore apicali minuto (edentulo ?). Mentum elevatuuij a solea discretum, facie superne latiore, suifulcro angustiore solese adnatum, antrorsum declive, soleje marginem anticum vix attingens, antice latius, rotundatum 1. bilobum, Isete ; To remove, however, any further doubts upon the subject, we shall let Professor Loven explain his own meaning, by giving a translated extract from his paper in the Royal Swedish Academy's Proceedings: — " The animal" (of Odostomia) " likewise shows, as Lowe has already remarked, the same characters" (as Chemnitzia), " which however have not up to the present time been properly under- stood. Lowe's description runs thus : ' Buccse labiales coalitse, infra tentacula exsertse, proboscidem abbreviatam, depressam, profunde emarginatam s. bilobam referentes,' and it has gene- rally been supposed that this part answers to the muzzle of Turbo : but that is not the case. This perfectly formed part is what I would call the mentum, the muscular mass which is so extremely developed in Natica, covering posteriorly a great part of the tentacles and mouth The proboscis, on the other hand, is again found in Odostomia and Turbonilla [Chemnitzia) in its place, that is, under the veil which is formed by the union of the bases of the tentacles, and is a very long organ for catching prey, which can only seldom, and by persevering observation,be detected. This maybe thereasonwhyithas beenoverlookedhereaswell as in Eulima,vf\ieYe it is also very long, but is seldom extended in ; The more completely to illustrate these remarks, a woodcut from a tracing of M. Loven's figure has been added. My own observations on th
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