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Report on the Alcyonaria collected by Professor Herdman at Ceylon in 1902 (Inglés) Tapa blanda – 4 mar 2012


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Tapa blanda, 4 mar 2012
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 Excerpt: ...due to the arrangement of the large flat whitish spicules and to their being outlined against the darker ground-colour of the stem and branches. The spicules of the general coenenchyma are flat and multituberculate, varying very much in size and shape. The tubercles are low and rough and very numerous. Many of the larger spicules extend the whole distance between two adjacent polyps, and sometimes even exceed this length. They fall into three groups, fairly distinct in shape: (a) large modified fusiform spicules, which taper more or less towards the ends and measure from 0'9 millim. to 3 millims. in length by 0'25 millim. to 0'45 millim. in breadth; (b) squamous or scale-like spicules, often with slightly lobed margins, which measure from 0'8 millim. to 11 millims. in length by 0'4 millim. to 0'6 millim. in breadth; and (c) large modified squamous spicules, consisting of a flattened tuberculate basal portion and of a projecting part which forms the projecting spine of the verrucae. They measure, in length by breadth in millimetres, as follows:--07 X 0'5; 0'6 X 0'4; 0'5 X 0'3. In the polyps there are slender spindle'shaped and club-shaped spicules. They are often slightly curved and either taper to both ends or are blunt and rounded at one end and pointed at the other. Many of these exhibit fairly prominent spines towards the thicker end. They vary considerably in size, being from 0'3 millim. to 0'5 millim. in length and from 0'02 millim. to 0'06 millim. in breadth. They are found chiefly in the tentacles, where they form an operculum to the retracted polyp; but an incomplete and irregular crown or collar is formed by them at the base of the tentacles. In colour the spicules vary from white to semitransparent, while the whole colony has a whitish-brown appea...

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