BOTANY Coleochaete scutata, Breb. Aphanothece prasina, A. Br. Nostoc commune, Vauch. Anabaena Hassalii, Wittr. Cylindrospermum macrospermum, Kuctz. Spirulina Jenneri, Kuetz. oscillarioides, Kuetz. Oscillatoria amphibia, C. Ag. tenuis, C. Ag. Sympluea muscorum, Gom. Symploea limosa, C. Ag. nigra, Vauch. Phormidium autumnale, Gom. Microcoleus terrestris, Desmaz. Gloiotrichia natans, Rabenh. Pisum, Thur. Batrachospermum moniliforme, Roth. vagum, C. Ag. ectocarpum, Sirod. Dillenii, Bory. MARINE ALG^E The flat muddy coast of the county, without any natural rocks capable of affording a stable anchorage, is not a favourable locality for seaweeds, hence the list of Essex seaweeds is not large. A list of the marine algae of Essex has been compiled by Mr. E. A. L. Batters, chiefly from the herbarium of Mr. G. P. Hope, 1 and it is from this source that I have obtained the following list. A few species are added from a list of seaweeds quite recently collected by Dr. H. C. Sorby and named by Mr. E. M. Holmes. So far as is at present known the marine flora of Essex consists of 158 species included in 95 genera, and is marked as much by the absence of many species common and abundant elsewhere as for the presence of a few which are very rarely met with on the shores of our islands. As examples of the latter class, Ectocarpus erectus, Phyllitis Jiliformis, Scinaia furcellata and Grateloupia Jilicina may be mentioned ; while as examples of the former, Calotbrix confervico/a, Desmarestia acu/eafa, Dictyosiphon fceniculaceui^ Asperococcus echinatus, Spbacelaria cirr&osa, Chordaria Jiagelliformis, Leatbesia difformis^ Laminaria digitata^ Saccorhiza bulbosa, Pehetia canaliculata^ Chantransia secundata^ Gelidium crina/e, Gigartina mammillosa, Callopbyllis /aciniata, Lomentaria c/ave//osa, Nitophyllum punctatum, Ceramium echionotum, C. acanthonotum^ C. ci/iafum, Polysiphonia fastigiafa, all of them common species, are ' conspicuous by their absence ' from the flora of Essex. The marine flora of Essex is southern in its character. The following have been recorded : Gloeocapsa crepidinum, Thur. Aphanocapsa marina, Hansg. Dermocarpa prasina, Born. Hyella caespitosa, Born. & Flah. Spirulina subsalsa, CErsted Oscillatoria corallina, Gom. Lyngbya semiplena, J. Ag. aestuarii, Liebman. Symploea hydnoides, Kuetz. Microcoleus chthonoplastes, Thur. Calothrix scopulorum, C. Ag. pulvinata, C. Ag. - confervicola, C. Ag. Isactis plana, Thur. Rivularia atra, Roth. Mastigocoleus testarum, Lagerh. Anabaena variabilis, Kuetz. Chlorochytrium inclusum, Kjellm. Monostroma laceratum, Thur. Enteromorpha ramulosa, Hook. - erecta, J. Ag. clathrata, C. Ag. canaliculate, Halt. percursa, Harv. compressa, L. intestinalis, L. - Linza, J. Ag. tubulosa, Kuetz. 1 Enex Naturalist, viii. i, and species recorded by E. M. Holmes in the same publication. 59
