54 
ROOM X. 
Nat. Hist. 
shells are generally covered with larger spines and tu¬ 
bercles. In many species of this division the spines are 
of nearly equal size, and the tubercles on which they 
are placed not pitted in the centre ( Echinus ); as the 
common Sea-Egg of the English coast (. Echinus escu - 
lentus ), much sought after as food during a part of the 
summer season, at which time the shell is almost entirely 
filled with eggs. Other species, in which the tubercles 
are of the same form, have some spines much longer 
than the rest ( Echinometra ); as the Spiniferous Sea- 
Egg (. Echinus lucunter), the Triangular-spined Sea- 
Egg (Echinus trigonarius), and the Artichoke, or 
Black Sea-Egg (. Echinus atratus ), peculiar for the 
larger spines being very short and truncated, forming 
a smooth surface, somewhat resembling a tessellated 
pavement. In some species which have the spines of 
an unequal size, the tubercles to which they are at¬ 
tached are pierced in the centre ( Cidaris ). Those 
called Turbans are of a spherical form, and have 
very narrow wavy rows of pores, as the Imperial Turban 
( Cidaris imperialis ) and the Porcupine Turban (Cidaris 
hystricc ); while those which are depressed, with narrow 
separate rows of pores, are called Diadems. These 
often have tubular spines, as the common Diadem ( Echi¬ 
nus diadema). 
Several of the species of the orbicular kind live in 
holes in rocks, and are believed, by some authors, to 
have the faculty, like the Piddock (. Pholas ), of boring 
into their substance. 
On the wall, between the windows, are the horns of 
some species of PJiinoceros, and round the Room, over 
the Cases, are suspended a series of the horns of va¬ 
rious species of Deer (Cervus), as the Elk, the Roe¬ 
buck, the Virginian and Mexican Deer, the Rein-Deer, 
the common Deer, the Indian Deer (Cervus hippela - 
phus), and its varieties; the common Stag and the 
Wapiti. On the top of the Cases are the Skulls of two 
Elephants and a Rhinoceros from India; two fine 
Elephant’s Tusks, presented by H. R. H. the Duke of 
Sussex; 
