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Show 136 Stout Acerate Spicules ZOOLOGICAL COLLECTIONS M A D E DURING [Jan. 4, A. caminus from off Brazil. f l'4to 1:6 m m . by -04434, smooth, \ straight, tapering to sharp [ points,scattered,not projecting. Fine Acerate of "Collar" ... Triradiates ... i. Ray ii. & iii. Kays /About 14? m m . by -0095 to \ -01108, straight, smooth. From outer surface to near inner surface. J Basalaborally(?)placed, -497 m m . 1 to -53 bv -057 to -075. | Laterals -39 m m . to -43 by '0475 { to -057. Rays tapering to sharp points from near base, slightly undulating. Castrally-placed spicules directed towards cloaca, oral angle about 150° ; the rest irregularly placed. Quadriradiates... On gastral surface and aggregated in groups in interior of wall. Lateral rays '14 mm. by -01267, or -228 by -019. Basal, aborally placed, -14 m m . to -19 by -01267. Apical -076 m m . by -0095. Rays smooth, tapering to sharp points from base; basal and oral lateral slightly undulating, the rest straight. Oral angle 150° to 160°. Var. crassior. About 2-5 (?) m m . by -04434 to •06334, smooth, straight, tapering from near middle,scatterecl, not projecting. About 1-25 (?) m m . by -095, straight, smooth. From outer surface to near inner surface. •64 m m . by -06334. •816 mm. by -06334. Rays smooth, slightly undulating, tapering to sharp points from base; angles equal; spicules variously placed. On gastral surface and aggregated in groups in interior of wall. Facials about -32 m m . by -019. Apical "16 (?) or 32 m m . by -019, and some smaller ones like those of the typical form. Rays smooth, tapering to sharp points from base, generally all somewhat curved. Oral angle either about 160° or 200°. Examined. In spirit, and by sections in balsam. Hab. Victoria Bank (off S.E. Brazil), 39 fathoms; bottom, coral. GRANTIA ATLANTICA, sp. n. (Plate XI. fig. 8.) {Grantia, Fleming, Hist. Brit. Anim. p. 524. Sycandra, Hackel, Kalkschwamme, ii. p. 291.) Sponge forming a single oval tube. Walls very thick (about two thirds the diameter of the cloaca) at centre, tapering to vent and closed end. Colour yellowish white in spirit. Vent surrounded by slight fringe of acerate spicules. Outer surface slightly roughened by points of acerate spicules, &c.; inner surface similarly roughened by apical rays of quadriradiates. Arrangement of canal-system agreeing with that of Sycandra, Hackel; the straight radial tubes extend to within a short distance of the dermal surface; they are hexagonal, and are completely fused with each other by broad connexions ; this intermediate substance is penetrated by narrow roundish " intercanals " running parallel with the radial tubes. The dermal layer, interposed between the ends of the radial tubes and the surface, consists of stout triradiate spicules and the exterior ends of the acerates. The substance of the wall between this and the cloacal surface is filled with the bases of the acerates, and with some more slender triradiate |