444 THE ZOOLOGIST. 



Sea-Urchin op 15 mm. weighing 1-7 gr. (continued). 



17 



18 



1G pebbles 

 12 „ 



1-6 



1-8 



0-941 

 1-058 



2-5 



0-1 



1-007 



0-592 



Sea-Urchin of 19 mm. weighing 4-3 gr. 



1 



2 



2 pebbles, operculum (? of Purpura) . . . 



2 ,, piece of seaweed, 12 cm. 



long, fragment of seaweed 



0-5 



2-7 



0-011 

 0-C27 



2-7 



0-5 



1-600 



0-319 



Three Sea-Urchins of 21 mm., each weighing 5-6 gr.* 



1 

 2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 



10 

 11 

 12 

 13 

 14 

 15 

 16 

 17 

 18 

 19 

 20 

 21 



6 pebbles, empty shell of Nassa 



1 pebble, empty shell of T. cinerarius 



8 pebbles, empty shell of Bissoa 



2 „ 



Large mass of seaweed 



4 pebbles, piece of seaweed 



2 ,, 2 pieces of seaweed 



9 ,, piece of seaweed 



1 pebble 



9 pebbles 



10 ,, empty shell of Purpura .. 



1 pebble 



10 pebbles 



9 



5 „ 



12 



2 „ 



5 



11 „ 



1 pebble 



6 pebbles 



3-5 

 1-5 

 2-0 



4-0 

 4-3 

 3-0 

 4-9 



2-8 

 3-5 



1-4 

 1-4 

 1-9 

 1-6 



0-9 

 1-0 

 0-5 



0-8 



0-625 

 0-267 

 0-357 



0-714 

 0-767 

 0-535 

 0-875 



0-500 

 0-625 



0-250 

 0-250 

 0-339 



0-285 



0-160 

 0-178 

 0-089 

 0-142 



4-9 



0-5 



2-294 



0-409 



* For the reasons mentioned in the footnote on p. 442, these Sea- 

 Urchins cannot be considered separately. The same remark applies to 

 those of 23 and 27 mm. 



