calycis tubuni superantia. Calyx tubulosus, membranacea, 10-costatus, 

 intus glabrus extus glanduloso-villosus, segmentis subaequalibus, posticis 2 

 saepissime latioribus et minus altius partitis, foliaceis, oblongo-aeutis vel 

 lanceolatis. Corolla extus glanduloso puberula. Stamina 4, aequilonga, 

 filarnentis pilosis, antherarum loculis aequalibus. Stylus staminibus aequi- 

 longus 1 stigmate simplici. Capsula oblonga acutiuscula, glabra ; semina 

 oblougo-obovoidea. 



Calycis tubus 7 mm. mat. 12-14 mm. longus. Segmenta juven. calycis fruct. 10 mm 

 longa et 3 mm. lata. Carolla 25 mm. longa. Capsula 7 mm. longa. 



Specimen unicum tan turn prostat, eaule absque parte superiore infer- 

 ioreque. Corollae color ignotus. 



Hab. in prov. Hitachi Japonic mediae detexit Y. Watahiki, mense 

 Aug. fl ? 



Contributions to the Knowledge of the Marine 

 Alga of Japan. III. 



By 

 K. Okamura, RigahuJtalcusM. 



With Pi. L 



NEW SPFCIES OF PKIONITIS. 



The species of Prionitis are known to occur in the Pacific Ocean 

 chiefly along the western coast of America and in New Holland. Some 

 few are recorded to grow in the sea of Corea and in the upper Pacific ; 

 but none on the coast of this country, as far as my knowledge goes. 

 Now this gap of distribution is filled up by my discovery of 5 species of 

 this genus, if my judgement about those species proves not to be at fault. 

 Two of them, I have already described in other places under different 

 names. I regret that I can not fully study their aifinities witti already 

 known other related species, as their specimens with the exception of 

 Prionitis lanceolata and Pr. Andersoniana are not in my hands. Those 

 five species, however, seem to show some relation to each other in several 

 points and they may be synoptically classified as follows : 



A. Fruits of both kinds formed both in terminal and lateral 



