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MARINE MOLLUSCA. f;09121. Murex (Ocinebra) submissus, n. sp. (PI, XXXV. fig. 13). XII.Testa minima, ovata, rimata, supra acuminata, albida, lineis interruptis nigro-fuscis cincta •anfractus 6|, superiores tres laeves, convexi, caeteri supra concave declives, costis longitudinalibusocto et liris spiralibus supra costas elatis (in anfr. penult. 2, in ultimo 8— 9) instructi, incrementilineis tenuissimis striati, ultimus in medio convexiusculus, antice contractus; apertura intus flavescens;labrum extra incrassatum, intus liris brevibus sex baud ad marginem productis munitum ; columellasinuosa, callo tenui reflexo flavescente induta,•in medio prominens, tuberculis parvis 3—4 munitacanalis anterior obliquus, recurvus.Longit. 8i mm., diam. 5.The dark brown transverse lines, about six or seven upon the last whorl, are interruptedbetween the costae, and falling upon the raised lirae, the ribs appear to be crossed by colouredtubercles.The costae are a little oblique and continuous up the spire. The smooth protoconch is markedoff from the first normal whorl by a slender varix or thickened lip of its last whorl. The threewhorls of which it consists have a yellowish marginatioii beneath the suture.122. Purpura armigera, Lamarck, 37,///. IX.123. Purpura bitubercularis, Lamarck, 37,///. IX.124. Purpura hippocastanum, Lamarck, 37,///. XI, XV.125. Purpura pica, Blainville, 37,///. IX.126. lopas situla. Reeve {Buccinum silula, Reeve, 37,11/.) IX.127. lopas sertum, Bruguiere (Buccinum sertum, Reeve, 37,111.) I.1 28. Sistrum digitatum, Lamarck (var. lobatum, Blainville ; Ricinula digitata, Reeve,37,111.) IX.129. Sistrum horridum, Lamarck {Eicinula horrida, Reeve, 37,///.) I, IX.130. Sistrum ricinus, Linn. (Nicimda arachnoides, Reeve, 37,111.) I, IX, XI, XV.131. Sistrum tuberculatum, Blainville (Ricinula tuberculata. Reeve, 37,111.) IX.132. Sistrum undatum, Chemnitz (Ricinula Jiscelhim, Reeve, 37, ///. Sistrum undatum,partim, Tryon, 41,//) VIII, X, XV.yellowish.133. Sistrum elatum, Blainville (Ricinula spectrum. Reeve, 37,111.) II, IX, XLIn the two fresh specimens obtained, the labrum is white, but the interior of the aperture is134. Sistrum spinosum, A. Adams (Ricimda chrysostoma, partim. Reeve, 37,111. Ricinulabiconica, partim, Tryon, 4:\,II.) XIII.Messrs H. and A. Adams (Genera Recent Mollusca, vol. i. p. 130) recognised that Reeve hadwrongly identified the Ricinula chrysostoma of Deshayes and imposed the name of spinosus uponthe misunderstood species. The term spinosus is applicable to fig. 12 6 rather than to 12 a, whichrepresents the Ricimda biconica of Blainville. I think therefore the species spinosus should berestricted to the figure 12 6. Whether it is conspecitic with S. biconicum has yet to be proved.Although united by Tryon, at present I am inclined to consider them sufficiently distinct.