72 Algfo incertise sedis, Laminarites. 



:'\ Hydrodictyopsls spec Mass,, Synop. Fl. foss. SeDog., p. 5,- Fl. foss. 287 

 Sonig.. p. 94, t. XXXIX, f. 13. 



In marga gypsosa miocenica «Sinigaglia» in agro Umbro{MASS.). 



Cen. Hyclmriis Ag., quoad characteres conf. Rabenhorst, Flora 

 Europfiea Algarum, III, p. 49, 



Thalhis adnatus gelatinosus plus minusve firraus, tubulosus, elon- 

 gatus, (5-10-15 cm. longus) plerumque varie divisus, lubricus, 

 suporficie nudus vel fibris subtilibus ex interno ortis, e cellularum 

 seriebus 1-2 formatis densissime obsitus; plurirai, saepe. innumeri 

 in Ccespitem fasciculatum aggregati. Cellulse initio globosae vel sub- 

 globosa^, postea elongatce vel ellipticae, saepe conoideae, polo uno 

 alterove achroae, in familias longitudinales plus minus regulariter 

 ordinata^ , tegumentis crassis, plerumque omnino diffluentibus laxe 

 connexa\ thallum constituentes. Cellularum divisio ad unam disse- 

 ctionem precipue in thallo apice et peripheria. Generatioues omnes 

 evolutae. 



1. Hydrurus? protogaeus Mass., Lett. Scarab., p. 9, n. 11; Synop. 28S 

 FI. foss. Senog., p. 5,- Fl. foss. Senig., p. 95, t. II, f. 3. — Fron- 

 de stipitata, gelatinoso-mucosa, tenuissiraa, in lacinias multipartitas, 

 penicillatas, substriolatas divisa. 



((Mondaino» prope Ariminum (Mass.). — Stipes mm. 2 diam. 

 ad mm. 12-14 supra basim ramuHs linearibus raraosissimis in- 

 structus. 



Gen. Laminarites Sternb. Brongn., Hist. Yq^. foss. p. 54. 



Frons stipitata, in(^ibranacea vel coriacea, costata vel ecostata, 

 laminam efformans plus minusve dilatatam subintogram vel divisam; 

 sporangia sparsa. 



1. Laminarites irideaephylius Mass., Palncoph. rar., pag. 19; Spec. 289 

 Photogr., p. 48, t. XVII, f. 1. Schimp., Tr. pal. v(3g., III, p. 446. 

 — Frons integra in parte inferiore inque stipitem attenuata, in 

 parte superiore regulariter sinuoso-lobulata, lobis obtusis et sub- 

 rotundis; costa perexili ad apicem procurrente, inferne crassiore 

 et in stipitem transeunte, basi in callum inferius cavum dilatatura, 

 In calcareo eocenico «Monte Bolca» in agro Feroncnse (Mass. 

 coll. propria). — Frons. cm. 36, longa, cra. 4 lata ; lobi cm. 1 

 longi, mm. 12-20 lati ; costa ram. 2 lata; stipes, cm. 4 long., (Mass.). 



