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Show 1881.] THE S U R V E Y O F H.M.S. 'ALERT.' 49 Obs. This species agrees with L. marsupium, Macgillivray, as described from Victoria in loc. cit., in every particular of the short description ; but that description is so short as to need the present fuller account. It resembles Schisoporella {Lepralia) venusta, Norman, in many points, but wants the rectangular area above the mouth, with its avicularium. SCHIZOPORELLA HYALINA, LillUe. Cellepora hyalina, Linne, Syst. Nat. (12) p. 1286. Schizoporella hyalina, Hincks, Hist. Brit. Mar. Polyz. p. 271, pi. xviii. fig. 8-10. (i.) Ordinary form. Nine small colonies, from Elizabeth Island (Straits of Magellan), 6 fathoms, on Fucus. One ditto from Portland Bay (S.W. Chili), 10 fathoms, on Fucus. (ii.) Var. tuberculata, Hincks (Hist. Brit. Mar. Polyz. p. 272) Four small colonies on Fucus, and one of doubtful origin ; all from Elizabeth Island, 6 fathoms. (iii.) Var. incrassata, Hincks {I. c. supra). Three colonies from Elizabeth Island, 6 fathoms, on Fucus. SCHIZOPORELLA SPINIFERA, Johnston ? Lepralia spinifera, Johnston, Brit. Zooph. (2) p. 324, pi. lvii. fig. 6. Schizoporella spinifera, Hincks, Hist. Brit. Mar. Polyz. p. 241, pi. xxxv. figs. 6-8. To this species is referred with much doubt a patch of a small-celled incrusting form, with very convex cells ; the articulations of 4 or 5 spines, now gone, are seen on the sometimes somewhat raised peristome. Surface covered with indistinct puncta ; sinus large and rounded, the margin at its upper angles drawn up into two vertical points. A large median avicularium on a slight elevation just below the mouth, the mandible pointing downwards. No ovicells. Hab. Tom Bay, S.W. Chili, 0-30 fathoms, on dead Retepora. SCHIZOPORELLA? sp. A glossy, obscurely punctured species without avicularia, with a shallow small sinus, and a short pointed rostrum on the lower edge of the mouth, and 7 to 8 slender spines on the raised peristome; zocecia convex ; no ocecia. Incrusting. Hab. Same as preceding. SCHIZOPORELLA LABIOSA, Busk. Lepralia labiosa, Busk, Cat. Polyz. Brit. Mus. p. 82, pi. lxxxiv. figs. 4, 5. This species should be described as having the surface of the cell either tuberculated regularly around a median ridge, or indented by lar'^e, mostly elongated grooves which radiate from a median ridge or bare surface which extends about halfway down the cell from below PROC. ZOOL. Soc-1881, No. IV. 4 |