Studies on the Hexactinellida.  Contribution 3.  (Placosoma, a New Euplectellid ; Leucopsacidae and Caulophacidae)

Iijima, Isao

Studies on the Hexactinellida. Contribution 3. (Placosoma, a New Euplectellid ; Leucopsacidae and Caulophacidae)

1903

Iijima, Isao

In this contribution I propose first to describe a new stalked Euplectellid of an interesting structure, which I call Placosoma paradictyum. This form became known to me after I had provisionally considered my studies of the Euplectellidae at end. It may however be best to describe it now and to follow it with some comments on the family generally, before I enter upon a treatment of other families. The present contribution will further contain full descriptions of six other forms, partly likewise new and partly before described by me in brief, viz., Leucopsacus orthodocus IJ., L. scoliodocus IJ., Chaunoplectella cavernosa IJ., C. spinifera n. sp., Caulophacus lotifolium n. sp. and Sympagella anomala n. sp. These will be referred to two families newly conceived and proposed for introduction into the system, viz., the Leucopsacidae and the Caulophacidae. The former group is in part identical with that which I have formerly regarded as a Rossellid subfamily under the name of Leucopsacinae (IJIMA '98 p. 41). The latter corresponds in a large measure to F. E. SCHULZE'S Asconematidae, which name will have to be dropped out. Grounds for the above rearrangement will be enunciated in the proper places.

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