LIST OF WOODCUTS. 



PASB 



I. — Generalised diagram of a Gymnoblastic Hydroid to illustrate terminology ... ... xiii 



II. — „ „ Calyptoblastic Hydroid to illustrate terminology ... ... ib. 



Fig. 



1. Diagraniatic section of a hydroid ... ... ... ... ... 27 



2. Hydrosoma of Campamdaria Johnstoni ... ... ... ... ... 23 



3. Portion of the hydrosoma of Calycella syringa, showing the operculate hydrotheca? ... 2.5 



4. Group of zooids from a colony of -H(/f/r«c<i';ii'a ecAi«a^a ... ... ... 30 



5. Ambulatory medusa of Clavatella prolifera ... ... ... ... 31 



6. Free locomotive sporosac of i)/cor(/Me ... ... ... ... ... ih. 



7. Adelocodonic gonophore of //yf/;«c//«j'« ec/i/wa^a ... ... ... ... 32 



8. Oceania coronaia ... ... ... ... ... ... ... 33 



9. Medusa, oi Campa)mhi)ia Jo/iiisloni ... ... ... ... ... 35 



10. Sexual zooid (sporo.sac) budding from a radiating canal in the blastocheme of Obelia 



geniculata ... ... ... ... ... ... ... ib. 



11. Medusa (r/m« iJrt»Y/(V), a blastocheme of unknown trophosome ... ... ... 37 



12. Portion of the ribbon-shaped sporosac, much enlarged, in a female specimen of Tima Bairdii ib. 



13. Diagrammatic sections of phanerocodonic and adelocodonic gonophores ... ... 39 



14. Longitudinal section through the hydranth and hydrotheca oi Laomedea Jlexnosa ... 41 



15. Types of gonophores ... ... ... ... ... ... 44 



16. Male gonophore of ii;/f/c?«fZ(7'MW... ... ... ... ... ... 46 



17. Sarsia slranyulata ... ... ... ... ... ... ... ib. 



18. Gonangium, with its contents, from ZaoOTefZe«^ca;?<o«a!... ... ... ... 48 



19. „ „ Obelia geniculata ... ... ... ... ib. 



20. „ „ Laomedea repens ... ... ... ... 49 



21. Female gonangium, with acrocyst of &»Yw/an'o j5?^??i«7o ... ... ... ... 50 



22. ,, „ Calycella lacerata ... ... ... ... ib. 



23. Mature female gonangium with marsupial chamber in (Sfer^w/arm rosare« ... ... 51 



24. Young female gonangium of iSfrtufo/'w rosacea ... ... ... ... ib. 



25. Very young female gonangium of (Sfe/^i^/arj'a rosacea ... ... ... ... 52 



26. Male and female gonangia of iSfer^e^Zarea <aOTan«ca ... ... ... ... 53 



27. A portion of the hydrosoma of Co/)/)?';w'a arc^a ... ... ... ... 54 



28. Gonangium with meconidia of Go«o</(yr(»a ioi'e??j (female) ... ... ... 57 



29. „ gonangial hydranths in i/a/ectMTO /ia/ec/wMOT ... ... ... 58 



30. Development of the corbula in vi(//aojo^e??/aj3/?<»ia ... ... ... ... 60 



31. ,, spermatozoa in Laomedea flexuosa ... ... ... ... 65 



32. Shedding and renewal of the hydranth in r^Jw/ar/a j«(Z/c!'4a ... ... ... 69 



33. Development of hydranth and hydrotheca in iao»8e(/ea^ca:Mosa ... ... ... 72 



34. „ the planoblast in Carymorpha nutans ... ... ... ... 77 



35. Segment of a yonng .^quorea ... ... ... ... ... ... 79 



36. Medusa, probably young Z)'?;/a ... ... ... ... ... 82 



37. >&r«/rt, with medusa-buds borne by the manubrium ... ... ... ... 83 



38. Medusa, bearing clusters of medusa-buds on bases of marginal tentacles ... ... ib. 



