File:Bulletin - United States National Museum (1907) (14594693057).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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Text Appearing Before Image:
t width 25mm. Length of the peduncle 20, width in themiddle 11 mm. The mandible (Plate V, fig. 2) has six teeth,counting the lower point. The upper tooth isacuminate and curved; the rest are of the usualsliape, the lower ones smallest. There is someshort pubescence upon the lower teeth and on the margin below them. The maxilla (Plate V, fig. 1) is peculiar. There is a single largespine at the upper angle and a deep excavation of the edge below it.The rest of the edge protrudes and is irregularly spinose, the spinesbeing very short. There is some fine and short pubescence at thelower angle. The cirri are all .short, the first (Plate V, fig. 5) with shorter, morelanceolate rami than the others. All have whorls of delicate bristles,longer and more numerous on the anterior side (Plate Y, fig. 1, thirdcirrus). The second to fifth cirri are of about equal length, the sixthlonger. The rami of cirrus i are composed of 6 and 7 segments, ii andiii of S, iv and v of 10, vi of 10 and 12 segments.
Text Appearing After Image:
36.—ALEPAS PACIFICA,NATURAL SIZE. 106 BULLETIN 60, UNITED STATES NATIONAL MUSEUM. The penis (Plate V, Ho-. 6) is stout and short, with only weak annu-lation, chiefl) in the median portion, and it is clothed with rather long-delicate hairs, which seem to be irregularly placed. The imperfectly calcified scuta are shaped much like those of Con-choderiiiu vlrgatum var. hunteri, but with an additional diverging lobeor ray below. Owing to the absence of definite outlines, the shape ofthe plate is not clearly to be seen. The t^pe is a large individual, with a 3oung one adhering at the baseof the capitulum. Several other smaller examples were taken with it.^1. pacijica is a much larger form than A. pellucida (Aurivillius) ofthe Atlantic. The integument is also less transparent. The arrange-ment of the teeth of the mandible is different, those of A. pacijicabeing more equally spaced, without a wider space below the upperspine. The maxilhe also are unlike in the Atlantic and Pacific species,t

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