Rev. T. Hincks's Catalogue of Zoophytes. 251 Alveolina meandrina (n. sp.), and therefore A. elliptica, are developed upon the same principle as Xummulifes elongated vertically. The former has an interseptal system and marginal plexus of canals; and the latter too, probably. In Alveolina elliptica the greater part of the test is often without chambers, so that its development is as often wholly carried on by the sarcode of the canal-system ; and the same is frequently the case with the last turns of the globose forms of Nummulites, e. g. N. perforata, &c.; while in Alveolina elliptica also, the chambers sometimes disappear and reappear at inter\'als, leaving the spire to go round by itself between them, as exemplified also in the annular canals of Orhitolites Mantelli and Orbitoides dispansa. These are the instances to which I have before alluded as evi-dencing a development of the chambers upon the sarcodal fila-ments of the canals. The new genus for which the term " Conulites" above-men-tioned is proposed has the following generic characters : — "Conical, compressed, discoidal; consisting externally of a spiral layer of rhomboidal chambers extending from the apex to the circumference ; filled up internally with convex layers of compressed columnar chambers interspersed with white columns of condensed shell-substance ; white columns opake, conical, their shai'p ends resting on the inner aspect of the spiral layer, and their large ones terminating at the base of the cone, which presents a slightly convex granular surface.'' XXVIII. — A Catalogue of the Zoophytes of South Devon and South Cornwall. By the Rev. Thomas Hincks, B.A. [Continued from p. 161.] [Plates VII. & VIII.] Order SERTULARID^, Huxley. Fam. Sertnlariadae, Johnst. 1. Halecium, Oken. 1. H. halecinum, Linn. Very common ; abundant and of great size amongst the trawl-refuse. 2. H. Beanii, Johnston. Very common ; dredged abundantly all along the coast, Very fine in Salcombe Bay and Torbay. I have a specimen which stands 5 inches high, while the spread of the branches measures 6 inches. [Lamlash, Arran ; Filey, Yorkshire ; Llandudno, N. W. ; Ramsay, Isle of Man.]
BioStor
