hex a corolla

[Gr. her =six, and Lat., ., corolla (q. v.). So named because in most cases the septa are arranged in six systems.] Zool.: A name for the Zoantharia sclerodermata (q. v.), containing the reef-bearing and other corals. hěx-ăc-ti-něl'-lą, s. [Gr. her =six, and dim in. of Gr. aktis (gen it. aktinos )=a ray.] Zool.: The typical genus of the family Hexact in ell ide (q. v.). hěx-ăc-ti-něl'-lid, a. & s. [HEXACT IN ELL A.] A. As adj .: Having six rigid spicules; of or belonging to the Hexactinellidæ, or any species of the family. tinellid sponges."-Nicholson: Palcont., i. 147. "At the present day we find 2.4 abundance of hexac B. As subst.: A sponge of the family Hexact in ell ide (q. v.). "In the Cretaceous deposits, and especially in the Chalk itself, the Hexactinellids are very largely and abundantly represented."-Nicholson: Palcont., 1. 146. hěx-ăc-ti-něl-li-dæ, s. pl. [Mod. Lat. hexact i nell ( a ); Lat. fem. pl. adj. suff. -idœ.] 1. Zool .: A family of siliceous sponges in which the skeleton is composed of six rayed spicules, generally large and, as a rule, becoming ultimately soldered together. The rays of the spicules are nearly always at right angles to each other. The species are found at great depths in the ocean. 2. Palæont .: The family began as early as the Silurian times. They abound in the Upper Jura ic and in the Cretaceous rocks, but are rarer in other formations. Where hexactinellid fo ils are found, they probably indicate that the stratum inclosing them was deposited in the depths of the ocean [1]. hěx-a-dăc-tyl-ous, a. [Gr. hexadaktylos, from her six, and daktylos a finger, a toe. Having six fingers or toes. hex-āde, s. [Gr. hex as (gen it. hexados ), from hex six.] A series of six numbers.