INTRODUCTION. Echin. 3 
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B. Geological : — 
i General 42 
ii Cainozoic : — 
a. General 42 
b. Pleistocene 42 
c. Pleiocene 42 
d. Meiocene 42 
e. Oligocene (Vacant) 
f. Eocene 43 
iii Mesozoic : — 
a. General (Vacant) 
b. Cretaceous {1. Upper. 2. Lower) . . 43 
c. Jurassic (i. Upper. 2. Middle. S. Lower) 45 
, d. Lias (including Rhaetic) .... 45 
e. Trias 46 
iv Palaeozoic : — 
a. General .46 
b. Permian . 46 
c. Permo-Carboniferous ..... 46 
d. Upper Carboniferous 46 
e. Lower Carboniferous 46 
f. Devonian 46 
g. Silurian 46 
h. Ordovician 47 
k. Cambrian . . . . . . (Vacant) 
1. Pre-Cambrian (Vacant) 
IV. — Systematic. 
A. Echinoderma, general 47 
B. Holothurioidea 47 
c. Echinoidea 50 
D. Asteroidea 74 
E. Ophiuroidea 80 
F. Crinoidea 87 
G. Cystidea and Edrioasteroidea 93 
H. Blastoidea 95 
K. Incertse Sedis 96 
INTRODUCTION. 
1. Titles. The total 303 is thus made up : 1891, 1 ; 1892, 3 ; 1896, 2 ; 
1898, 2; 1899, 2; 1900, 3; 1901,10; 1902, 12; 1903, 27; 1904, 239; 
1905, 2. The sudden decline in both the total and the number for the 
year is partly due to a change in the method of obtaining the titles, 
partly to the fact that longer working hours at the British Museum (Nat. 
Hist.) render it more difhcult for members of the staff to utilize the library 
of that establishment. In these circumstances the task of copying titles, 
indexing names, and sorting slips has been mainly performed by Miss 
Grant, to whose intelligent care I am deeply indebted. Making further 
allowance for the usual deficiency, the following numbers of writings 
dealing with Echinoderms in the years 1891-1904 inclusive, prove a genuine 
increase in the annual output : 189, 171, 166, 155, 172, 219, 198, 230, 264, 
318, 314, 289, 317, 240. That this has not been accompanied by increase 
in the length of the Record is clear from comparison of my predecessor's 
