LIST OF FIGURES. vil* 



FIG. PAOE 



31. Dissection of Arenicola. In part after Gamble and 



Ashworth . . . *.. . 92 



32. Sthenelais boa, a sand Polynoid. After Johnston . . 97 



33. Paddle-worm (Pkyllodoce lamelligerd) . 99 



34. Head and introvert of paddle-worm. After Ehlers . 100 



35. Introvert of Nereis pelagica to show teeth. After Ehlers 104 



36. Foot of NepJithys hombergii. After Ehlers . . 109 



37. Sand-mason (Terebella) removed from tube . . 113 



38. Pectinaria belgica. After Malmgren . . . 115 



39. Serpula vermicularis in tube . ... 117 



40. Sea-snake (Linens marinus) . ... 121 



41. Solaster papposus, or sun-star . . . 128 



42. Common brittle-star (Opliiothrixfragilis) . . . 129 



43. Disc of sand-star (Ophiura) . . . 130 



44. Aristotle's lantern from sea-urchin . . .136 



45. Sea-urchin (Echinus esculentus) . ... 138 



46. Sea-cucumber (Cucumaria planci). After Bell. . . 144 



47. Prawn (Palcemon squilld) ' . . . 151 



48. Lobster (Homarus vulgaris) . ... 152 



49. Shore crab (Carcinus manias') . ... 153 



50. Foot-jaws of lobster and of crab . . .160 



51. Scaly Galathea (Galathea squamifera) . . . 177 



52. Hairy porcelain-crab (Porcellana platycheles) . .179 



53. Hermit-crab (Pagurus bernhardus) . . 184 



54. Masked crab (Corystes cassivelaunus). In part after 



Herbst . f . , "... 189 



55. Spider-crab (Eyas araneus) . . . .197 



56. Long-legged spider-crab (Stenorhynchus phalangium) . 198 



57. Wrinkled swimming crab (Portunus depurator) . . 202 



58. Megalopa of shore crab. After Brook . . . 206 



59. Mysis stage of Norway lobster. After Sars . . 206 



60. Opossum-shrimp (Mysis flexuosa) . . . 209 



61. Head and tail of Mysis. After Bell . . .212 



62. Idotea tricuspidata. In part from Bate and Westwood . 216 



63. Gammarus locusta . - . . . .217 



64. Caprella linearis . . . . . 218 



65. Sea-spider (Pycnogonum littorale) . . . 221 



66. Under surface of limpet (Patella) . . 226 



67. Chiton marginatus . . ... 228 



68. Tortoise-shell limpet (Acmcea testudinalis) . . 233 



