On Gasteropodous Mollusca from the Gulfof Suez. 121 anyhow they must be kept clear and distinct in the mind in order to make progress in scientific zootomy. While protesting against the abandonment of the very use-ful, nay, necessary term "homology," I accept with pleasure Mr. Lankester's new terms, and thank him very cordially for this latest contribution to philosophical anatomy. IX.-On some Genera and Species of Gasteropodous Mol-lusca collected by Mr. M'Andrew in the Guif of Suez. By ARTHUR ADAMS, F.L.S.MR. M'ANDREW having submitted to my inspection numeroussmall and obscure forms of marine gasteropodous Mollusca,for the purpose of identification, I have made a careful exa-mination and comparison of them, to assist him in his re-searches into the geographical distribution of Mollusca, andhave included the results in this paper. Fam. Risaoidae. Genus CERATIA, H. & A. Ad. C. pyrgula, A. Ad. C. testa turbinato-turrita, imperforata, alba, tenui, nitida, semi-opaca, spira apice obtusa; anfract. 5, convexis, suturis profundis; apertura ovata, antice vix effusa et subdilatata; labio arcuato, acuto. Hab. Gulf of Suez. A turreted, turbinate, semiopaque white shell, with theapex of the spire very obtuse, and with the aperture some-what effuse and dilated anteriorly. Genus MICROSTELMA, A. Ad. M. concinna, A. Ad.M. testa ovato-turrita, imperforata, alba; anfract. 7, planis, postico angulatis, supremis longitudinaliter plicatis, plicis rectis, validis, sequalibus, interstitiis transversim striatis; anfractu ultimo magno, plicis evanidis; apertura oblongo-ovata, antice producta, effusa; labio arcuato, simplici; labro postice ad suturam angulato. Hab. Guif of Suez. The only other shell I have seen resembling this somewhatworn specimen found by Mr. M'Andrew is Microstelna doedala,A. Ad., from the Gotto Islands, in Japan (Ann. & Mag. Nat.Hist. 1863, xi.p.348). The nucleolar whorls are unfortunately
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