PLATE 12 
All specimens coated and magnified x 31.5 
Fic. 1. Polygnathus cf. communis Branson & Mehl 
a. Aboral view of specimen X 516. b. Oral view of specimen X 516. c. Lateral view of 
specimen X 516. 
Fics. 2-5. Polygnathus communis communis Branson & Mehl 
2a. Oral view of specimen X 348. 2b. Aboral view of specimen X 348. 2c. Lateral view of 
specimen X 348. 3a. Oral view of specimen X 347. 3b. Aboral view of specimen X 347. 
3c. Lateral view of specimen X 347. 4a. Aboral view of specimen X 430. 4b. Oral view of 
specimen X 430. 4c. Lateral view of specimen X 430. 5a. Oral view of specimen X 346. 
5b. Aboral view of specimen X 346. 5c. Lateral view of specimen X 346. 
Fics. 6-8, 10. Pseudopolygnathus nodomarginatus (E. R. Branson) 
6a. Oral view of specimen X 495. 6b. Aboral view of specimen X 495. 6c. Lateral view of 
specimen X 495. 7a. Aboral view of specimen X 493. 7b. Oral view of specimen X 493. 
7c. Lateral view of specimen X 493. 8a. Oral view of specimen X 494 showing rounding of 
posterior termination. 8b. Aboral view of specimen X 494 showing rounding of posterior 
termination. 8c. Lateral view of specimen X 494. 10a. Aboral view of specimen X 492. 
tob. Oral view of specimen X 492. 10c. Lateral view of specimen X 492. 
Fics. 9, 11. Siphonodella isosticha (Cooper) 
ga. Oral view of specimen X 534. 9b. Aboral view of specimen X 534. Ita. Oral view of 
specimen X 535. 11b. Aboral view of specimen X 535. 
Fic. 12. Siphonodella sp. A 
a. Aboral view of specimen X 537. b. Oral view of specimen X 537. 
Fic. 13. Siphonodella obsoleta Hass 
a. Aboral view of specimen X 536. b. Oral view of specimen X 536. c. Lateral view of 
specimen X 536. 
