Bulletin - United States National Museum . Fig. 6.—ScALPELLrM presscm. a, ven-tral view; ;*, LATERAL VIEW. X O. 24 BULLETIN 60; UNITED STATES NATIONAL MUSEUM. The carina is moderately arcuate, with the iiml)o projectintr a little,near the apex. The roof is convex, and shows a few weak longitudinalstriae at the sides. The sides (parietes) are rather narrow; the intra-parietes are somewhat wider. The upper lateral plate is larg-er than in related species, pentago-nal. The carinal and two lower facets are subequal. The scutal mar-gin is about twice as long as the basal, and the tergal margin is s
Bulletin - United States National Museum . Fig. 6.—ScALPELLrM presscm. a, ven-tral view; ;*, LATERAL VIEW. X O. 24 BULLETIN 60; UNITED STATES NATIONAL MUSEUM. The carina is moderately arcuate, with the iiml)o projectintr a little,near the apex. The roof is convex, and shows a few weak longitudinalstriae at the sides. The sides (parietes) are rather narrow; the intra-parietes are somewhat wider. The upper lateral plate is larg-er than in related species, pentago-nal. The carinal and two lower facets are subequal. The scutal mar-gin is about twice as long as the basal, and the tergal margin is slightlylonger than the scutal. The umbo is not quite terminal. The rostrum is very long, narrowly wedge-shaped, slightly enlargedat the projecting apex. The rostral latus is triangular, a trifle longer than wide. The ros-tral margin is slightly convex, the lateral margin slightly sinuous,the scutal margin somewhat concave. The inframedian latus is more than twice as high as wide, withthe umbo on the rostral margin below the middle. The
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
