rotifera, mesozoa. Verm. 63 
Pkilodina commensalis , n. sp., on Asellus vulgaris , neighbourhood of 
London ; Western, J. Quekett Club, v, p. 156. 
( Pleurotrocha grandis) Western, = Diglena ferox , n. sp. ; Western, 
t. c. p. 155. 
Polyarthra aptera , n. sp., Scottish lakes and pools ; Hood, t. c. p. 281. 
Rathulus bicornis, n. sp., Roehampton, Scotland, and Ireland ; Western, 
t . c. p. 159, and p. 308. 
Rhinops orbiculodiscus , Thorpe, in China, probably = type of new genus; 
Tiiorpe, J. R. Micr. Soc. pp. 145-152. 
Rotifer plialeratus , n. sp., or (?) only new var. of R. vulgaris , Ireland ; 
Glascott, t. c. p. 88. 
Sacculus hyalinus , Kellie., in Rhino ; Lauterborn, Zool. Jahrb. 
Syst. vii. 
Salphia , n. sp., for Euchlanis bicarinata, Perty. ; Dixon Nuttall, J. R. 
Micr. Soc. p. 639. 
Stephanoceros eichhornii , description of male; Western, J. Quekett 
Club, v, p. 157. 
Synchaita grandis , n. sp., Greater Lake of Plon ; Zach arias, t. c. 
Triarthra longisetosus, Ehrb., var. limnetica , n. var., Greater Lake of 
Plon ; Zacharias, t. c. 
TrocJiosphaera solslitialis , n. sp., Chiua, and reference of the genus to the 
family Hydatinidce instead of to the Mellicerlidce as an aberrant 
form, on account of the shape of the ovary ; Thorpe, t. c. p. 147. 
MESOZOA. 
Monticelli, Rend. Acc. Liucei (5) ii, pp. 39 & 40, describes under 
the name of Treptoplax , n. g., reptans , n. sp ., an animal with no trace of 
organs, but having 3 layers of cells and exhibitingamoeboid movements. 
It would seem to be most nearly allied to Triclioplax adhaerens , 
Schultze, but differs from it in having no somatic muscles, by the 
fact that of the two outer layers of cells, which are both epithelial, 
the ventral one only is ciliated ; also the refringent bodies instead 
of being iuside the animal are on the surface, and the pigment 
masses of Triclioplax are absent. It was found crawling on the 
glass of the tanks at the Naples Aquarium. It multiplies by simple 
division into two. 
Thiele, Abh. Ges. Isis, 1892, pp. 54-57, discusses the systematic position 
of Salinella, x Trichoplax , &c., concluding that they are to be regarded 
as degenerate Metazoa, the Ctenophora being primitive. 
