PLATE I. 
Figs, 1-3, 
Figs, 4, 5, 
Figs, 6, 7, 
Fig, 8, 
Botrylloides tyreum} n, sp, 
Botrylloides jperspicuum, n, sp, 
Botrylloides perspicuum, var, ruhicundum, nov, 
Botrylloides nigrum, n, sp. 
Fig. 1. A colony oi Botrylloides tyreum;^ natural size. 
Fig. 2. A small part of the same colony, enlarged, to show the arrangement of the 
Ascidiozooids. 
Fig. 3. A very small part of the same, still more enlarged, to show the structure of 
the anterior end of the Ascidiozooid. 
Fig. 4. A colony of Botrylloides perspicuum ; natural size. 
Fig, 5, A small part of the same colony, enlarged to show the arrangement of the 
Ascidiozooids in a system, the common cloacal aperture, and the terminal 
bulbs on the vessels in the test. 
Fig. 6. A colony of Botrylloides perspicuum, var, ruhicundum; natural size. 
Fig. 7. Another colony of the same variety ; natural size. 
Fig. 8. A colony of Botrylloides nigrum ; natural size. 
^ On the plate this species is called Botrylloides purpureum. As that name was pre-occupied it has been changed to 
Botrylloides tyreum. 
