Streptelasma, 400. 
Streptis, 416. 
Streptorhyncus, 416, 432. 
Strepula, 410. 
Stricklandia, 416. 
Stromatopora, 398, 00, 412, 428. 
Stromatoporella, 428. 
Strophomena, 413, 416, 431, 432. 
Stylarea, 400. 
Stylodictyon, 428. 
Temnograptus, 397. 
Tentaculites, 403. 
Terebratula, 472, 416, 431, 433, 400. 
Tetradium, 400. 
INDEX. 
Tetragonis, 390. 
Tetragraptus, 397. 
Tetraster, 401. 
Thamniscus, 412. 
Thamnograptus, 397. 
Theca, 419. 
Thecostegites, 400. 
Traquaria, 445. 
Tretoceras, 422. 
Trichograptus, 397. 
Trichomanes, 444. 
Trichomanites, 444. 
Trichotaster, 401. 
Trigonocarpon, 445. 
Trinodus, 404. 
Trinucleus, 410, 
Triplesia, 416. 
Turrilepas, 410. 
Ulodendron, 447, 443. 
Uncites, 433. 
Urnatopteris, 445. 
Uronectes, 456, 
Volkmannia, 445. 
Waldheimia, 416, 433. 
Whitfieldia, 416. 
Woodwardites, 447, 445. 
Trochoceras, 427, 422, 423. 
Xestoleberis, 457. 
Xiphoearis, 410. 
Xylobius, 458. 
Xystrodus, 463. 
Youngia, 457. 
Zaphrentis, 429. 
Zeilleria, 440, 445. 
Zenaspis, 423. 
Zygocrinus, 448. 
Zygopteris, 442. 
Zygosporites, 442. 
46 
4 
