. An account of the alcyonarians collected by the Royal Indian marine survey ship Investigator in the Indian Ocean. Alcyonaria. 70 Cortical spicules : (a) Those of the stem are spindles, straight or curved, averaging about 0-48 ram. long, with regularly arranged simple spines ; also a few irregularly branched, flat, smooth, striated forms. (b) Those of the stalk are short, thick spindles, which average about 0-30 mm. in length, clubs, tripods, discs, three-rayed and globular forms, and numerous irregular forms including variously shaped twins. Canal-wall spicules : {a) In the stem there are nu
. An account of the alcyonarians collected by the Royal Indian marine survey ship Investigator in the Indian Ocean. Alcyonaria. 70 Cortical spicules : (a) Those of the stem are spindles, straight or curved, averaging about 0-48 ram. long, with regularly arranged simple spines ; also a few irregularly branched, flat, smooth, striated forms. (b) Those of the stalk are short, thick spindles, which average about 0-30 mm. in length, clubs, tripods, discs, three-rayed and globular forms, and numerous irregular forms including variously shaped twins. Canal-wall spicules : {a) In the stem there are numerous smooth, flat, spindle- to star-shaped forms with toothed edges. (b) Those of the stalk are similar to the preceding. Colour—Stalk greyish ; stem, main branches and lower parts of secondary branches pinkish-grey ; upi)er parts of branches and twigs brown ; polyps yellowish-brown. Locality : Arakan Coast, 13 fathoms. Dendronephthya delicatissima, Henderson. This species is represented by a beautiful specimen which measures 5 1 cm. in height and has a maximum breadth of 47 cm. The colony is remarkable for its fine contrasting colours. The stalk is of medium length, being 2'5 cm. long, and is rigid. The base is slightly broken, but it is almost certain that it was broad. It is thrown into a number of furrows and ridges, and its upper portion is partly concealed by reflexed lower branches. The polyparium is compact, bluntly oval in shape, and shows a slightly greater growth in one plane ; it is D-shaped in section in the lower part. It consists of a number of main branches which arise from the stem on all sides, and three portions into which the stem finally divides, and which give the apex a blunt, roughly triangular shape. The majority of the main branches arise from the stem almost at right angles. Two of the lowest branches are flat- tened, leaf-like structures almost surrounding the stem, leaving two small free spaces, in one of which there is a small branch with cylin
Size: 1172px × 2132px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorthomsonjarthurjohnart, bookcentury1900, bookdecade1900
