File:Bulletin - United States National Museum (1907) (14777962561).jpg

Identifier: bulletinunitedst601907unit (find matches)
Title: Bulletin - United States National Museum
Year: 1877 (1870s)
Authors: United States National Museum Smithsonian Institution United States. Dept. of the Interior
Subjects: Science
Publisher: Washington : Smithsonian Institution Press, (etc.) for sale by the Supt. of Docs., U.S. Govt Print. Off.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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)lets. Umbo at theapex. The rostrum is triangular, very small and short, somewhat widerthan high. The rostral latus is low, the length of the plate being more thanfour times its width. The upper and lower margins are parallel.An angle runs obliquely from the beak toward the baso-lateral angle. The inframedian latus is quadrangular, with one of the upperangles produced toward the carina. The umbo is subcentral, a littlenearer the rostral margin; from it a rib runs to each of the angles ofthe plate.
Text Appearing After Image:
Fig. U.—Scalpellitm rathbun.k. n, rostral, h, carinal, and C, lateral views of type X 2; (1. INFRAMEDIAN LATUS OFANOTHER INDIVIDUAL X 4. 42 BULLETIN GO; UNITED STATES NATIONAL MUSEUM. The carinal latus is triangular, with the umbo projecting he^^ond thebase of the carina and a little recurved. Several ribs radiate fromthe umbo. The peduncle is about as long as the capitulum, closeh^ covered withan open mosaic or pavement of very minute, scarcel) imbricatingscales, of about 0.2 or 0.3 mm. width. Length of capitulum 20, width 12 mm. Length of peduncle 21 mm.Length of the carina 10, diameter at l)ase 2 mm. In this species the inframedian lateral plate is of a peculiar irregularshape. The rostral latera are narrow, unlike those of related species. A second example from the same station as the tvpe differs by hav-ing the bordering ribs almost obliterated on the lower half of thecarina, and the inframedian lateral plate on the left side is almostregularly quadrate (fig. lid). This species

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