DESCB1PTI0^^ OF THE ENGEAVrN-GS. 953 



PLATE X. (Diatoms and Protozoa). 



Figure 183. Isthmia enervis. 184. Spiedi-a Ulna. *185. S. capitata. 185. S. 

 Ivmaris. 186. Podosphenia gracilis. 187-190. Gomphonema constrictum. 191-193. 

 Licmophora flabellata. 194, 195. Cocconema lanceolatum. 196-198. C. Cistula, 

 199-202. Achnanthes brevipes. 203, 204. Ehabdonema arcuatum. 205. Acineta 

 niystacina. 206. Syncyclia Salpa. 207. Scliizonema Hoffmannii. 208. Micromega 

 Agardliii. Protozoa: — 209-211. Cyclidium G-laucoma. 212. Pantotriclium Enchelys. 

 213. Chaetomonas G-lobulus. 214, 215. Chgetotyplila araiata. 216-218. Cliaetoglena 

 Tolvocina. 219, 220. Peridinium Tripos. 221. P. Michaelis. 222, 223. Peridinium 

 Fusus. 224-226. Grlenodinium apiculatum. 227. Trichodina tentaculata. 228-230. 

 T. Pediciilus. 231, 232. Urocentrimi Tui-bo. 233, 234. Stentor Koeselii. 



PLATE XI. (Diatoms). 



Figures 1 to 8. Epithemia turgida (Thwaites) : 1. A view of concave surface ; 2. A 

 side view ; 3. Apposition of concave surfaces in the first stage of conjugation ; 4. A front 

 view of a single endochrome, showing it to have divided into two segments ; 5. The young 

 sporangia lying transversely between the cleft parent frustules ; 6. The same, viewed end- 

 ways, shoAving their cylindrical figure ; 7. Increased growth of the sporangia ; 8. The pro- 

 duced sporangia ultimately much larger than parent fronds, and now striated like the 

 latter. At the commencement of conjugation the fronds are enveloped in mucus, as shown. 

 9, 10, 11, 12. Gomphonema curvatum (Thwaites), Ulustratiug the process of conjugation 

 in this being, wliicli generally resembles that in Epithemia. 14. Melosira nummvdoides 

 (Ealfs). 17. Gomphonema minutissimum (Thwaites) conjugating. 18. Dinophysis acuta 

 (Ein-.), f.v. 19. D. limbata(Elu:'.), f. V. 20 & 27. Melosira coarctata (Ehr.), f. vs. 21,22. 

 Amphitetras antediluviana (Ealfs) : 21. A partial s. v. ; 22. filament. 24, 25. Tetracyclus 

 lacustris (Ealfs) : 24. Filament ; 25. A marginal view. 26. Melosira sulcata (Ehr.), a 

 filament. 28. Actinoptychus Jupiter (Ehr.). 29. Melosu-a Itahca (Ehr.), filament, 

 30. Sphenosira Catena (Ehr.), filament. 31. Actinoptychus? hexaptera (Ehr.). 32. 

 Ampbipentas? alternans (Eiir.). 33. Asterolampra Marylandica (Eiu'.). 34. Asterom- 

 phalus Hookeri (Ehr.). 35. Heliopelta Metii (Ehr.). 36. Symbolophora Trinitatis (Ehr.). 

 37. Spii'illina vivipara (Ehr.) : a member of the family Ai'cellina, having a close affinity 

 with the calcareous-shelled Polythalamia or Foraminifera. 38. Craspedodiscus elegans 

 (Ehi\). 39, 40. Coscinodiscus radiatus (Ehr.) : 39. f. v. ; 40. s. v. 41, 42. Eupodiscus 

 Argus (Elu\): 41. f.v.; 42. s. v. (In fig. 41, the sites of the three tubular processes, 

 which led Ehrenberg at first to call it Ti'ipodiscus, are seen.) 43, 44. Triceratium Favus 

 (Elu-.) : 43. f. V. ; 44. s. v. 45, 46. Climacosphenia moniligera (Ehr.) : 45, f. v. ; 46. s. v. 

 47. Terpsinoe musica (Ehr.). 48, 49. Grammatophora gibba (Ehr.): 48. f. v., showing 

 the two imperfect septa (vittse, Kiitz.) at each end; 49. s. v. 50, 51. Zygoceros Surirella 

 (Ehi*.): 50, s. V. ; 51. f.v. 52,53. Grammatophora marina (Elu*.): 52. f.v. ; 53. s. v. 

 54. Hemiaulus antarcticus (Ehr.), f. v. 



PLATE XII. (Diatoms, Protozoa, &c.). 



Figure 1. Amphiprora constricta (Elu-.), f. v. 2, 3, 4. Surirella Gemma (Ehr.) : 

 2, 3. f. V. ; 4. s. V. : these figures were intended especially to represent the foot-like pro- 

 cesses (ciha ?) and the foramhia through which these are protruded. 5. Navicula cuspidata 

 (Ehr.;, s. v. 6. N. amphu-hyncus (Ehr.), s. v. 7, 8, 9. Stauroneis phyllodes (Ehr.): 

 7, 8. s. V. ; 9. f. V. 10, 14, 30. Stam-oneis scalaris (Ein-.) : 10. s. v. ; 14. Process of self- 

 division seen on f. v. ; 30, s. v. 11. Campylodiscus flexuosa (Ehr.), f. v. 12, 13, 22, 23. 

 C. Ehrenbergii (Ehr.): 12 & 22. f. vs. ; 23. s. v. ; 13. Viewed lying on one end. 15 & 31. 

 Navicida major (Ehr.): 15. s. v. ; 31. f.v. 16, Stam-oneis dilatata (Ehr.), s. v. 17,18. 

 S. Phoenicenteron (Ehr.) : 17. f. v. ; 18. s. v. 19, 20. Surirella Craticula (Ehi\) : 19. f. v. ; 

 20. s. V. 21. Navicula Tabellaria (Ehr.), s. v. 24, 25. Epithemia Librile (Ehr. ) : 24. f. v. ; 

 25. s.v. Z6, Amphora gracilis (Ehr.), s. v. 27. Epithemia gibba (Ehr.), ventral surface. 

 23 & 53. Gomphonema apiculatum (Ehr.): 28. f.v.; b3. s.v. 29. Himantidium 

 monodon (Ehr.), s. v. 32. Navicula affinis (Elir.), s. v. 33. N. Chilensis (Ehr.), 

 ventral surface, s.v. 34 & 36. Synedra Gallionii (Ehr.): 34. f.v. of fom* conjoined; 

 36. s.v. 35. Gomphonema Vibrio (Elir.), s.v. 37. Amphora navicidaris (Ehr.), f.v. 

 38. A. Libyca (Ehr.), f v. 39. Eunotia quinaria (Elu-.), s.v. 40. Diadesmis Isevis 

 (Ehr.), f.v. 41. Cocconeis Fiimica (Ehr.), s.v. 42. C. oceanica (Eln*.), s.v. 43. -Na- 

 vicula Esox (Ehr.), s.v. 44. Nitzschia valens (Ehr.), f.v. 45, 49, 50, 51, 52. Himan- 

 tidium Papilio (Elu-.): 45 k 51. Filaments; 49. A single frustule seen on ventral 



