ILLUSTRATIONS IN THE TEXT. 



PIGS. PAGE 



25. Tethyum fasciculatum Bohadsch . . 6 

 26. T. sociabile Gunner .... 7 



27. Holothurium Iseve Vandelli . . .8 



28. dona intestinalis : mantle . . .13 



29. C. fascicularis : tentacular filaments . . 16 

 30. Corella parallelogram-ma : part of branchial sac 20 



31. ,, biliary ducts . 22 



32 23 

 33. }) reproductive organs 24 



34. male vesicle . 25 



35. C. ovata : part of branchial sac . . 33 

 36. Molgula concJiilega : part of branchial sac . 43 



37. M. complanata : part of branchial sac . . 46 



38, 39. M. valvata : test, two views . . .50 



40. If. simplex : part of branchial sac . . 52 



41. ,, tentacular filament . . 52 



42. M. siphonata : test . . . .54 



43. )} reproductive organs . . 56 



44. M. socialis : part of branchial sac . . 57 



45. M. inconspicua : pai-t of branchial sac . . 60 



46. M. citrina : reproductive organs . . 63 



47. ,, ,, testicles . . . .64 



48, 49. Eugyra arenosa : parts of branchial sac . 67 



50. Cynthia rosea : mantle . . . .77 



51. C. claudicans : liver . . . .80 



52. C. squamulosa : . . . .80 



53. )} tentacular filament . . 83 



54. C. ovata : mantle . . . .85 



55. liver 88 



