M.
- Mackerel, [43], [74]
- Mackerel, Horse, [39]
- Marine Worms, [50]
- May-chit, [19], [63], [66], [87]
- Medusae, [49 (note)]
- Merganser, [13], [72]
- Mergus acutirostris, [13]
- Mergus cristatus, [82], [88]
- Mergus major, [8], [57]
- Mergus minor, [13]
- Mergus mustelaris, [77]
- Mergus serratus, [18], [83]
- Mergulus, [77], [79]
- Merlin, [78]
- Merrett, Christopher, [xxii]., [57]
- Mistletoe, [70]
- Migration, [xvi]., [2 (note)]
- Miller's Thumb, [54]
- Minnow, [53]
- Mole Cricket, [55 (note)], [56]
- Moon-fish (Mola), [38], [64]
- Moor Hen, [15]
- Morinellus, [19], [73], [76], [80]
- Musca tuliparum, [67], [74]
- Mullet, [40], [65]
- Mullet, Red, [40], [62], [65], [87]
- Mussels, [47]
- Musk Beetle, [58]
- Mustela fluviatilis, [54]
- Mustela marina, [39]
- Mustela variegata, [14]
N.
- Needle-fish, [40 (note)], [41], [66]
- Nerites, [47], [73], [77]
- Night-jar, [26], [63], [66], [87]
- Norway Lobster, [46 (note)]
- Notonacton, [55 (note)], [56], [71]
- Nuthatch, [21]
O.
- Oak Galls, [69], [70], [75]
- Octopus?, [46 (note)], [86]
- Oldenburg, Henry, [82]
- Onocrotalus, [16], [64]
- Ophidian, [65]
- Osprey, [4], [78]
- Otters, [56]
- Oysters, [46]
- Oyster Catcher, [8 (note)]
P.
- Parrot Jay, [30], [63], [67], [87]
- Partridge, [27]
- Partridge, Red-legged, [28]
- Pectines, [47]
- Pediculus marinus, [49]
- Pelican, [16], [64]
- Perch, [52]
- Periwinkle, [47], [55 (note)], [56]
- Peter-fish, [41]
- Physalus, [49], [65]
- Pica marina, [8]
- Picus martius, [21]
- Pigs, Solid-footed, [77], [80], [81]
- Pike, [52]
- Pilchard, [44], [81]
- Pinax, [57], [87]
- Pintail Duck, [14], [77], [80]
- Piscis octangularis, [41], [62], [65], [87]
- Pisidium?, [55 (note)]
- Place, [45]
- Plot, Dr. Robert, [xxiv. (note)]
- Plover, Green, [19 (note)], [20]
- Plover, Grey, [20]
- Plover, Ring, [23]
- Pogge, [41 (note)]
- Polypus, [46], [86]
- Porbeagle, [57 (note)], [61], [86]
- Porpoise, [34]
- Porci solidi pedes, [77], [80], [81]
- Primmes, [42], [73]
- Pristis serra, [36], [83], [88]
- Puets, [10]
- Puffin, [17], [73]
- Pungitius, [44], [58]
Q.