Natural History

Cover Natural History
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thick.
Basal skeleton consisting of spicules transversely arranged, and crossing each other in an irregular manner.
Spicules. Large, smooth, slightly curved styles, or occasionally strongyles, 2240 X 40/i.
Cortical tyles, with small spheroidal head, short neck, fusiform straight shaft, varying in length from 140 to 350 jx, and in thickness from 12 to 19 /x. A few very slender styles scattered in the choanosome, 70 X 6 /x, with head and neck making an angle with the shaft. Some medium-sized cort
...ical tyles in the oscular papilla with long, oval heads. Tyles of the stellate clusters, slender, with the head making an angle with the shaft, 20T) x 15 /x.
There are fourteen large specimens and five very small ones of this species. The largest is 8 cm. in diameter and 4 ' 5 cm. high ; and the smallest, which is triangular, VOL. IV. 2 16 R. KIRKPATRICK.
is 8 mm. high, 8 mm. in length at the base, and 4 mm. in thickness. In some the pile has been rubbed oflf, exposing the smooth, fleshy cortex.


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