471 



nied arm;uiia hos Penlremiles. — Alia thomber ba- 

 lande Cystideer, rned filer ulan armar, aro forsedda 

 ined stjelk; sa aFvcii Agelacriiiites. De armlosa Cy- 

 slideerna utaii ilioinber synas lialva varit fastade 

 aiitingt-n slai)digt ellei' under en tidigare period af 

 deras liF; men beskafFenlielen af de sannolikt korla 

 sljelkaiua ar obekanf. Hos Ecbinospliaerites ocb 

 Pseudociiniles ar sJJelken al" sanima byggnad son^ 

 hos Crinoideerna, cylindrisk, af ringforniiga leder, 

 vanligen bredare, men tunnare mot kroppen, a( 

 olika tjocklek och slundorn af alternerande olika 

 storlek. Stundonj ar deras yttie jla kolad, hvari- 

 genom de najijot likna Cornuliter, med bvilka de for 

 ofrigt bafva inlet gemensamt. — J)e britiska Cysti- 

 deerna uppstaller Forbes pa foljande vis. 



A. Assularum numerus definitus. 



a. Brachiis pra}dita et rhombis peclinatis. (Form. siJurea 

 superior). 



Pseudocrinites Pearce Proc. geol. soc. IV, 160. 

 — "Corpus orbiculare, di-seu-letragonum, rhom- 

 biferum, angulis truncatis; brachia duo vel qua- 

 tuor, exserta, appressa; sulci brachiales recti. Os 

 rotundum.'* terminale; anus lateralis, subterminalis; 

 ossicula ovarialia sex. Assulae basales quatuor; 

 infraovariales quinque; centroJaterales quinque; su- 

 praovariales quinque; apicales? Basis plana; co- 

 lumna longa, crassa, cylindrica, prooe basin tu- 

 mida." — P. bifasciatus Peapce t. 11; P. magni- 

 ficus FoRB. n sp. t. 12; P. quadrifasciatus Pearce 

 t. 13; P. oblongus Forb. n. sp. t. 14. Omnes ad 

 Dudley. 



Apiocystites Forb. n. g. — "Corpus oblongum, 

 telragonum, rhombiferum, angulis truncatis, ex- 

 cavatis; brachia quatuor, plana, in sulcis angu- 

 lorum inclusa; sulci brachiales oblique lobulati. Os 

 transversum, terminale; anus lateralis, subterminalis; 

 ossicula ovarialia lateralia sex. Assula3 basales qua- 

 tuor; infraovariales quinque; cenlrolaterales quin- 

 qiit>; supraovarialos quinque; apicales? Basis pla- 



