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 MARINE ZOOLOGY 7. Cynthia morus, Forbes. Animal barely ^ inch in width, wider than high, warty, attached by a wide base ; colour, magenta crimson ; branchial orifice with four pale lobes. A specimen pre- served for some years in formalin has successfully retained its colour. Somewhat rare ; trawled. Hastings. ASCIDIM COMPOSITE BOTRYLLID^ 8. Botryllus sch/osseri.f Brighton. 9. Botryllus pslycyclus.f Brighton. 10. Botryllus bivittatus.f Brighton. 1 1 . Leptoclinum listerianumA Brighton. 12. Distoma ruhrum. Brighton. 13. Amaroecium, sp. Specimen consists of a little flat gelatinous mass, inch in thickness, and i^ inches in length, lobed around the edge, and with the margin folded over upwards and inwards, like a clenched fist. One or two delicate algae pass up through the centre. The mass is translucent, colourless, and the zooids are of an opaque grey-buff, and are seen here and there in well defined oblong systems. In other portions the systems become indistinct, and in parts, there is no arrangement at all. There is no common aperture. The zooid has a six-lobed branchial orifice, a long atrial languet, a long post-abdomen, which terminates in a flattened rounded lobe, with another lobe more or less well formed on either side. Anus, from lateral view, is bilobed ? Em- bedded in the gelatinous matrix is a little sand. The specimen does not appear to correspond with either of the species proliferum, nordmanni, or argus but bears some resemblance in the lobed character of the specimen to Apiidlum fallax. In combining the two characters of systemic and non-systemic arrangement of the zooids the specimen bears a resemblance to A. irregulare var. concinnum, Herdman, from different latitudes. Rare. Hastings. 14. Amaroecium argus A Brighton. 107