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Note on the graptolites found by Mr Henderson at Habbie’s Howe, Logan Burn

1874; Zoological Society of London; Volume: 2; Issue: 3 Linguagem: Inglês

10.1144/transed.2.3.375

2052-9414

Charles Lapworth,

Paleontology and Stratigraphy of Fossils

The graptolites obtained by Mr Henderson from the shaly Silurian beds of Habbie’s Howe, and which I have had in my possession for determination, belong at least to three distinct genera. The most frequent fossil (marked 1 on the pieces of shale exhibited) is a peculiar form, which is usually held to be merely a variety of Monograptus colonus (Barrande). It differs from the typical form in several minor respects, such as the shape of the thecae, the direction of the apertural spines, the rate of taper in the polypary, c in the Wenlock rocks of South Roxburghshire, and in the Wenlock and Lower Ludlow of the typical Siluria. The variety under notice has been