386 Miscellaneous. twenty-three to thirtj^-one ; among the individuals (all of large size) in which the phenomenon was not observed the number of arms varied from thirty -nine to forty-two. The great number of arms in old individuals thus seems to be connected with this forma-tion of intercalary arms. I have recognized some indications of an analogous formation in Heliaster. In connexion with this I will remark that, in Brisinga medi terra nea, the nine arms are entirely formed before the close of the larval period; young examples of Solaster and Acanthaster did not present any arms in course of for-mation. In order to classify the starfishes of the sea around Cape Horn I have had to form the new genera Diplastinas, Asterodenna, Porani-opsis, Cribraster, Lebrioiaster, and Asterodon. In the genus Diplas-tinas I range Asterias-iorms which have at least two rows of adam-bulacral spines ; Asferoderma includes ^stenVe without any apparent spines or pedicellariae, and in which the dorsal skeleton is almost deficient. The genus Poraniopsis presents characters exactly inter-mediate between those of Echinaster and Porania ; the animals of this genus have the ventral surface differentiated from the dorsal surface and thick integuments, like the Poranixe, while the very short arms are rounded and covered with spines. The Crihrasteres axe Cribrellce having paxilli upon the ventral surface ; in Lebrnn-aster marginal plates begin to be difl^erentiated. These animals form the passage towards the Ganerice, which themselves lead to the Ct/cethra;, The species of Asterodon, previously classed with the Goniasteridse, are in reality Archasteridae. They are charac-terized by their dentary plates, each having a hyaline spine laid down upon them with its point directed outwards ; these two spines may unite and form only a single hyaline interradial spine, resem-bling the dentary plume of the sea-urchins. Asterodon has also at the angle of the arms an unpaired marginal plate, and the ven-tral spines often group themselves into multifid pedicellariae, as in Pectinaster, E. P. To this genus must be referred Astrogonium singulare, Miill. & Tr., A. meridionalis, Smith, Pentagonaster Belli, Studer, CalUderma Orayi, Bell, and two new species, Asterodon pedicellaris and granulosus. — Comptes Rendus, March 12, 1888, p. 763. Oti Nephromyces, a new Genus of Fungi parasitic in the Kidney of the Molgulidoe. By M. A. Giaed. In a fine memoir on Cgclostoma elegans, M. Garnault * has recently noticed the existence in this mollusk of a closed organ ( glande a concretions of Claparcde) which contains at the same time uric products and symbiotic bacilli. Several years ago I observed phenomena of symbiosis of the same kind in the completely closed * ' Recherches anatomiques et lilstologiques sur le Cyclostoma elegans,' pp. 49-60 (1887).