Dr. J. E. Gray on Zuophytes with Pinnated Tentacles. 439 the alternate interstices elevated, pure black, spotted with ashy; antenna? reddish only at the base; legs black. Length 2 hues. Besides the difference in colour, which in this genus is per-haps not very important, and the greater width, which attains its niaxiinuin at the junction of the prothorax with the elytra in this species, whilst in A. rufipes it is at about the upper third of the elytra, it is also distinguished by the joints of the club being very decidedly longer ; both are also very nearly allied to Arace-rus * CoffecB, F., which, however, is smaller and more convex, with proportionably longer antennae, and generally has a patch of several longish grey hairs on the shoulders ; from this I find it difficult to distinguish Tj'opideres fragilis of Mr. Walker, from Ceylon, the type of which is in my collection. XLV. — On the Arrangement of Zoophytes with Pinnated Tentacles. By Dr. J. E. Gray, F.R.S., V.P.Z.S., Pres. Ent. Soc, &c. Considerable attention has been paid by various authors to the arrangement of the stony Corals {Actinaria), by MM. Milne-Edwards and Haime, and by Mr. Dana among others; but com-paratively little progress has been made in the arrangement of the Zoophytes with pinnated tentacles, or Alcyonaria, since the time of Lamarck. I have for years been studying these animals and the corals which they form, and have only been prevented from publishing the result of my studies by the desire to feel more sure with regard to the distinction between the species of the family of Gorgoniadse, and to ascertain with greater certainty than I have yet been able the true synonymy of the species of the genera of that family. In the meantime I would suggest the following arrangement of the families, as that which best explains the relation of the various genera to each other. Order L SABULICOL^. Coral-tree symmetrical, with a simple base, supported by more or less distinct calcareous spicula, and strengthened by a single, fusiform, elongate, calcareous, central axis. Living with the base sunk in the sand or mud of the sea-coast. Fam. 1. PeimatulidsB. Body free, more or less pen-like, with a naked peduncle and a * More correctly Ar^ocerus ', but I hold that the orthography of the ori-ginal authority ought never to be departed from, except in the case of some very gross and insufferable blunder. Schonherr first iproposed Arcecerus in his " Curculionidum Dispositio Methodica," p. 40, and repeated it without alteration in his " Svnonvmia."
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