194 I). Echinodermata. 



divided in two parts by a crease or joint. Arm-spines standing on outer edge of 

 side arm-plates. Two genital openings in each interbracliial space. Lyman ( 53 ). 



Ophiopyrgus n. g. Disk high and dome- shaped , covered with thick swollen pla- 

 tes, and surmounted by a central primary plate , which rises like a cone. Arms 

 slender, smooth and tubular, with side arm-plates very large, and upper and un- 

 der arm-plates small. Basal tentacle-pores very large; those beyond small and 

 situated near sides of arm. An arm-comb. Arm-spines minute, and standing on 

 outer edge of side arm-plate. Two long genital openings in each interbrachial 

 space. Lyman ( 53 ). 



Ophiosciasma n. g. Disk covered with thick soft skin finely granulated. Arms 

 very slender, with lower and side plates imperfectly calcified , and no upper pla- 

 tes. Mouth-papillae and teeth represented by a bunch of spines, or thorns, at 

 apex of jaw. Arm-spines arranged on sides of side arm-plates. Two large genital 

 openings in each interbrachial space." Lyman ( 53 ; . 



Ophiotkrichoides n. g. Scheibe nackt, sonst wie Ophiothrix. Ludwig ( 51 ) ; Lymani 

 n. Brasilien. 



OpMotrochus n. g. Disk flat and round, covered with thin, more or less granulated 

 scales, and naked radial shields. Arms slender , tubular, each joint constricted 

 at its base ; side arm-plates meeting widely above and below ; upper arm-plates 

 rudimentary. Scale of second pair of mouth-tentacles lying between side mouth- 

 shield and outer mouth -papillae. There are teeth and mouth-papillae; no tooth- 

 papillae. Smooth arm-spines on outer edges of side arm-plates. Lyman ( 53 ). 



4. Echinoidea. 



Ein Abschnitt des Agassiz schen Werkes liber die Echinoiden der Challenger- 

 Expedition [vergl. Bericht f. 1SS1. I. p. 204] ist nochmals zum Abdruck ge- 

 langt (2). 



Bell ( 7 ) hat die Form der in den Ambulacralftifichen der Echinoiden vorkom- 

 menden Kalkkorperchen einer vergleichenden Untersuchung uuterworfen und 

 dabei insbesondere gefunden, daB die Echiniden und Echinometriden in demBesitz 

 C foriniger Kalkkorperchen miteinander iibereinstimmen , wahrend diese bei den 

 Cidariden, Saleniden, Echinothuriden, Echinocidariden und Diadematiden fehlen. 

 Abgebildet werdeu die Kalkkorperchen aus der Wand derArnbulacralfiiBchen von: 

 Echinus margaritaceus , Cottaldia Forbesiana , Echinocidaris Dufresnii , Echinothrix 

 turcarum, Diadema setoswn, Micropyga tuberculata, Asthenosoma pellttcidum, Phor- 

 mosoma bursamim, Salenia hastigera. 



Bbhm ( 13 ) beschreibt als neu aus dem Tertiar: Hipponoe Sckneideri, Echino- 

 lampas depressus, elevatus, Brissomorpha Mojsvari, Bnssopatagus sundaicus, Hemi- 

 patagus Madurae uud Spatangomorpha n. g, (1 n. sp.). 



Cotteau ( 20 , 21 ) beschreibt von Cuba aus der Kreide : Echinocomis Lanieri 

 (d'Orb.i Cott.. antillensis Cott. ; aus dem Eocan : Echinopedina cubensis Cott., 

 Echinolampas Castroi Cott., semiorbis Cott., Asterostoma Fimenoi Cott., cubense 

 Cott., Hemiaster Dewalquei Cott., antillensis Cott., Peripneust.es antillarum Cott., 

 Macropneustes cubensis Cott., Breynia cubensis Cott.; aus deni Miocan : Clypeaster 

 cubensis Cott., Encope Ciae de Cortazar, Echinolampas lycopersicus Guppy, Brissop- 

 sis Fimenoi Cott. , Schizaster Scillae Ag., Parkinsoni Ag. ; aus neueren Ab- 

 lagerungen: Echinoneus orbicularis Des., Hemiaster cubensis (d'Orb.). 



In seinem kurzen Bericht iiber die von ihrn in Gemeinschaft rnit Peron und 

 Gauthier vorgenomnaene Bearbeitung der fossilen Echiniden von Algier erwahnt 

 Cotteau ( 24 ) , daft in den dortigen Senonschichten 6 1 Arteu vorkommen, von denen 



