DE9CB1PTI0N OF ENGEATlXGS. 



co; 



PLATE XIX. (llev. W. Smith.) 

 All the figures in this Plate are magnified 400 diameters (except fig. 2.) 



Figs. 1. Plearosiorma (Naviciila) formosnm. avernije length l-66th. 



2. A piece of the same shell, mas^nified 5,500 diameters. 



3. Pleurosigma (Navicula) speeiosum 



4. elongatum 



5. delicatulum 



6. striijosum 



7, 8, y angulatum 



10. distortum 



llj 12. — — obscurum. 



PLATE XX. (Rev. W. Smith.) 



AUthe 



Figs. 1, 

 4. 

 5, 

 6. 

 7. 

 8, 

 9. 



10. 



11. 



12. 



13. 



14. 

 15,16. 



17. 



18. 



19, 



Figures in this Plate are magnified 400 diameters (except figs. 1, 

 8, and 11, which are magnified 3,200 diameters.) 



2, 3. Pleurosigma (Navicula) Balticum 



■ Strigilis 



acuminatum 



Fasciola 



prolongatum 



— littorale 



Hippocampus 



young specimen 



attenuatura 



A piece of Shell, fig. 1 

 „ 11 



lacustre 

 Spencerii, 



young specimen 

 frontviewshowiug self-division 



PLATE XXI. 



The following figures are derived from M. Dujardin's excellent treatise, 

 "Histoii-e des Infusoires." 



Figs. 1. Hexamita nodulosa 

 2. Anthophyra Mulleri 

 3 and 4. Acineta tuberosa. 

 fig. 4 the cilia included 



5. Heteromitii ovata 



6. Crumenula texta 



7. Polyselmis viridis 

 8- Anisonema sulcata 



9. a. b. Oxyri'his marina 

 Figs 10. rt. b. Ploeotia vitrea 



11. Heteronema marina 



12. a. b. Zyzoselmis nebulosa 



In 



13. Peranema globulosa 



14. Cyclidium distortum 



15. Cyclidium abscissam 



16. a. b. Acomia cyclidium. Fig. 



6, self-dividing 

 Figs 17. a. b. Acomia vitrea. Fig. 6, 

 self-diviJing 



18. Gastrocliaeta fissa 



19. a. b. Enchelys corrugata 



20. Alysam saltans 



21. a. b. Acineria incurvata 



22. a. b. Diophrys marina 



