28. THE PHYLLOSOMA LARVA OF THE COMMON SPINY LOBSTER (_Palinurus vulgaris_--SEE PLATE V.). MUCH ENLARGED 72 29. LARVAL STAGES OF THE PRAWN _Penæus_ (SEE PLATE IV.). × 45 74 30. NEWLY-HATCHED YOUNG OF A CRAYFISH (_Astacus fluviatilis_). ENLARGED 76 31. YOUNG SPECIMEN OF AN AFRICAN RIVER CRAB (_Potamon johnstoni_), TAKEN FROM THE ABDOMEN OF THE MOTHER. MUCH ENLARGED 78 32. EARLY LARVAL STAGE OF A SPECIES OF SQUILLA, PROBABLY _S. dubia_. × 10 80 33. LARVAL STAGES OF THE BRINE SHRIMP (_Artemia salina_) 81 34. EARLY NAUPLIUS LARVA OF A COPEPOD (_Cyclops_). MUCH ENLARGED 82 35. LARVAL STAGES OF THE COMMON ROCK BARNACLE (_Balanus balanoides_--SEE PLATE III.) 83 36. A COMMON HERMIT CRAB (_Eupagurus bernhardus_) REMOVED FROM THE SHELL 91 37. _Pylocheles miersii_, A SYMMETRICAL HERMIT CRAB 94 38. _Callianassa stebbingi_ (FEMALE), A SAND-BURROWING THALASSINID FROM THE SOUTH COAST OF ENGLAND. NATURAL SIZE 103 39. THE COMMON SAND-HOPPER (_Talitrus saltator_), MALE, FROM THE SIDE. × 3 108 40. A, A PIECE OF A TROPICAL SEA-WEED (_Halimeda_); B, A CRAB (_Huenia proteus_) WHICH LIVES AMONG THE FRONDS OF _Halimeda_, AND CLOSELY RESEMBLES THEM IN FORM AND COLOUR. REDUCED 110 41. THE COMMON PORCELAIN CRAB (_Porcellana longicornis_), SLIGHTLY ENLARGED, AND ONE OF THE THIRD MAXILLIPEDS DETACHED AND FURTHER ENLARGED TO SHOW THE FRINGE OF LONG HAIRS 113 42. A DEEP-SEA LOBSTER (_Nephropsis stewartii_), FROM THE BAY OF BENGAL. REDUCED 122 43. _Munidopsis regia_, A DEEP-SEA GALATHEID FROM THE BAY OF BENGAL. REDUCED 123 44. _Thaumastocheles zaleucus._ REDUCED 129 45. A DEEP-SEA CRAB (_Platymaia wyville-thomsoni._) REDUCED 131 46. _Polycheles phosphorus_, ONE OF THE ERYONIDEA, FEMALE, FROM THE INDIAN SEAS 133 47. _Eryon propinquus_, ONE OF THE FOSSIL ERYONIDEA, FROM THE JURASSIC ROCKS OF SOLENHOFEN 135 48. _Conchoecia curta_, AN OSTRACOD OF THE PLANKTON. × 40 144