542 Algae. 



Peridiniutn spinulosum Murr, and Whitt. , P. coniciim (Gran) Ostf. 

 and Schm., P. turnidtun sp. nov. , P. elegans Cleve, P. diabolusCleve, 

 Phalacroma Mitra Schutt, P. sp., Prorocentrum niicans Ehrb.?, 

 Pyrocystis pseiidonoctüiica Murr., P. ftisifovntis Murr., P. lanceolata 

 Schröder, P. hinula Schutt, P. haniulus Cleve, Aidosphaera lahrado- 

 riensis Borgert, Cannosphaera geometrica Borgert, Protocyotis xipho- 

 don (ffaeckel) Borgert, Dictyocysta temphini Haeckel, Codonella Osten- 

 feldi Schmidt, C. morchella Cleve, Tintinnopsis lohiancoi v. Daday, 

 T. fracta Brandt, T. aperta Brandt, T. tubulosa Levand em. Brandt, 

 T. Davidoffi v, cylindvica v. Daday (?) Brandt, T. Mortenseni Schmidt, 

 T. nordquisti Brandt, T. sp. , (J. campanida Ehrb.?, Cyttarocylus 

 Ehrenbergii (Clap. et Lachm.) Fol., C. Ehrenhergii (Clap. et Lachm.) 

 var. Claparedei (v. Daday) Brandt, Ptychocylis undella (Ostf. and 

 Schm.) Brandt, P. {Rhabdotiella) spiralis (Fol.) Brandt, var. Tintinnus 

 mediterraneiis Mereschk. v. longa Brandt? T. fraknoi v. Daday, T. 

 acuminatus Clap. et Lachm. 



Peridinium ttirnidian Okam. sp. nov. is characterised by the 

 swollen body and by the possession of a rib stretched between the 

 bases of the antapical horns, and is nearly related to P. elegans 

 from which it differs in the shape and size of the body, in the 

 absence of teeth at the bases of the antapical horns and in the almost 

 horizontal girdle. 



As a PostScript the author ventures to put down a comparative 

 table between the Ceratiunt sp. described or mentioned by Schröder 

 in his "Beiträge zur Kenntnis des Phytoplanktons warmer Meere" 

 and those set forth by the author in the present paper. It is as 

 follows: 



Cevatium subcontortum Schröder := C. contortmn (Gourr.) Cleve, 

 C. saltaiis Sehr. := C. gibberum Gourr., C. Okaninrai Sehr. = probably 

 C. hovridimt f., C. aequatoriale Sehr. = a form of C. viiltur Cleve, 

 C. ceylanicuni Sehr. = C. patentissimiim Ostf. and Schm., C. elegans 

 Sehr. =z C. patentissimiun Ostf. and Schm., C. Hnndhausenz Sehr. z=z 

 C. volans Cleve, C. pahnatiim Sehr. =r probablj^ C. ranipes Cleve, 

 Pyrocystis hamidus Cleve var. seniicivcularis Sehr. = P. hamidiis f. 



K. Okamura. 



Okamura, K., Icones of Japanese Algae. (Vol. I, N«. 1. (PI. I—V). 

 English. May, 1907. Tokyo. Price 2.50 mk. for every number.) 



The author publishes the present "Icones" on his own account; 

 they may be taken as the continuation oi his former work 

 entitled "Ilustrations of the Marine Algae of Japan, (which had to be 

 discontinued after the issue of only 6 numbers (PI. I— XXX). In the 

 present number the following 8 species are described: Microdadia 

 elegans n. sp., Microciadia corallinae (Mart.) Okam., Carpoblepharis 

 Schrnitsiana (Rbd.) Okam., Scinaia furcellata (Turn.) Biv., Chondria 

 crassicaidis Haw., Zonaria Diestägiana J. Ag., Hydroclathrus cancel- 

 lahis Bory, Cylindrocarpus ritgosa Okam. 



Microdadia elegans n. sp. has the following diagnoses: Frond linear, 

 ancipito-compressed, membranaceous, erect or ascending being 

 decumbent on other algae. Ramification alternato-pinnate, distichous, 

 with erect and alternate ramuli and ramelli which have dichotomous 

 bifid apices. Tetrasporangia somewhat regularly arranged in longitu- 

 dinal rows in ramelli, cruciate or irregularly triparted. Cystocarps 

 sessile on the apex or side of ramelli, provided with simple or 

 forked, flat involucre. 



Descriptions are given in English for those plants which are 



