Nachtrag. 257 



iiculeatis, connecticulis ramorum linearibus apices in rhoinbi for- 

 iiiaui, sicut in Dictyocorynis, connectentibus. Diam. major sine 

 aculeis -^"', minor fere ^"', disci ^"'. Ramorum crassities ^"', 

 apex clavatus ^j-'"- Longit. acul. ^'". 



In statu integro forsan tota connecticulorum area membrana 

 tcnui cellulosa repleta est. Cfr. Spongiastrum 1861. 



Icon in Microgeologia 1854 Tab. XXXVI fig. 33 centies 

 aucta est. 



240) StylocycUa dimidiata, discus nucleatus, nucleo subquadran- 

 gulo in Capsula media integerrima, 5 — 6 annulis concentricis cellu- 

 losis circumdata, spinis 2 a medio tenuiter incipientibus sensim 

 crassioribus, in aculeos fortes transeuntibus. Diam. totius y^"\ 

 luiclei ^"', capsulae -j^^. Cell, fere 3 in ■^"'- Conferatur Tetra- 

 sulenioy talis nuclei similis. 



241) Stylodictya clavata, discus gyroso-annulatus et spinoso- 

 rudiatus, gyris prope radios interceptis 5 spiralibus, a cellula me- 

 dia orbiculari incipientibus. Annuli omnes poris amplis discretis nu- 

 merosis ocellati. Radii spinescentes fere 7 prope centrum tenuiores, 

 in margine liberi incrassati conico-cucullati. Diam. disci sine acul. 

 yy'", cellulae mediae 3-y^'". Fori gyrorum 3 — 4 in ^"', coni ra- 

 diorum apicales cucullati brevea ^"^ 



242) Stylodictya Echinastrum, disco spinoso, gyroso bispirali. 

 Gyri subannulati 4 — 5. Superficies spongioso-porosa et aspera, 

 pojris contiguis. Radii spinescentes 24 exteriores, fortiter aculeati. 

 Diam. disci ^"'. Long, radii majoris ■^"'. 



243) Stylodictya gracilis, disco eleganter concentrico, cellula 

 media rotunda parva, primo circulo sublobato reliquis integris, su- 

 perficie poris parvis densis subseriatis ornata. Spinae radiatae, e ceu- 

 tro fere exeuntes 4 — 5, cruciatae principales, interjectis aliis non 

 e centro oriundis, exsertis subsetaceis. Diam. disci (circulis 4) sine 

 spinis ^V "• Long. Spinae majoris ^"'. 



244) Stylodictya hastata^ disco spongiaceo concentrice annulato, 

 cellula media parva, superficie poris discretis parvis raris instructa, 

 aculeis marginaiibus crassis hastatis ultra 6 (3 — 10?). Diam. disci 

 (circulis 5) jV"'- Long. acul. ^g-'". Diam. cell, mediae tj-j'". 



