\\AI.YTCA1. IM>RX. 



Description, ...... PAO I I - 



Plt. \\ I \., explained, .... ib. 



Miscellaneous observations, ..... il.. 



COMATULA RABBATA, ..... ISO 



This animal nearly allied to the Ophiura, . . . ib. 



Form, organs, and habits, .... ib. 



Liable to great mutilation, . . . . . ib. 



Food unknown, ...... Ul 



Not to rare in Orkney at elsewhere in Scotland, . . ib. 



Plate XXX., explained, ..... ib. 



ECBINCS, THE SEA URCHIN, ..... ib. 



Observation* of reputable author* imperfect, . . ib. 



Inefficiency of Artists, Ac., . . . . . 12- 



1. ECHINUS BFIUJEKA, ..... 1 - . 



Sue, organs, peculiarities, and habiu, . . ib. 



Spinet of nse in prehension or seizure, . . . 1 -ji ; 



Can travel on its back by means of the spines and suckers, . ib. 



Carries even-thing useful or useless on its back, . . ib. 



The spines are deciduous, but reproduction restores them, . ib. 



Di vented of the spines the shell resembles an orange, . 127 



Colour darkens with age, . . . * .138 



Shell about the sixteenth of an inch thick, . . ib. 



Planked like the hull of a vessel, . . . ib. 



Orifice above surrounded internally with the orarium, . ib. 



If uninjured is not of difficult preservation, . . . 129 



Natural propensity to destroy, .... ib. 



Reputed to hare been used as food by the ancients, . . ib. 

 Said to have been formerly brought to the Edinburgh Market for 



the sake of the roe, ... . . ib. 



One species denominated Echinut fdulit, ... ib. 



Animal described, . . . . . .130 



Pediccllarias cover the Echinus in thousands, . . 181 



The head separates from the stalk, . 132 



Not separate and independent parasites, . . . ib. 



Plates XXXI., XXXII., explained, ib. 



2. ECHIXUS (SPAXTAXOUI PCETCEEC*), 133 



Another kind of Echinus, . ib. 



Very different in form, and less familiar to naturalists, ib. 



Called Mm'* face, and Monkey fact, by the Scottish fishermen, ib. 



Belongs to deep water, and is often permanently buried in the sand, ib. 



