132 CLARK., 



3. Echinometra subangularis (Leske). 



This species is often called the " rock-boring" urchin as it is 

 found in holes in the rocks about the reefs, where it is common. 

 Color varies considerably, from reddish to black ; the spines 

 vary from light-brown, more or less greenish and tipped with 

 violet, to almost black. The test is always oval or elliptical 

 and somewhat flattened. 



4. Toxopneustes variegatus (Lamk.). 



A medium-sized almost spherical urchin, with numerous 

 spines. The color varies greatly but Bermuda specimens are 

 rich violet. Abundant. 



5. Hipponoe esculenta (Leske). 



A large, nearly spherical urchin with numerous short, white 

 spines. Not common. 



6. Mellita sexforis A. Ac. 



This sand-dollar may be recognized at once by its extreme 

 flatness and the six slits through the test. Color of Bermuda 

 specimens, brown. Not common. 



7. Echinoneus semilunaris (Gmel.). 



This little elliptical spatangoid, seldom over an inch long, is 

 easily recognized by the five equal, simple, narrow ambulacra 

 extending from aboral pole to mouth. The spines are very 

 short and light brown in color. In life the tube feet are bright 

 red and stand out in striking contrast. Is found in the sand 

 underneath rocks but has not been collected in Bermuda for 

 some years. 



8. Brissus unicolor (Kl.). 



Oval spatangoid seldom over three inches long, of a grayish- 

 brown color with numerous very short spines. Found in the 

 same location with the precedmg, and like it has not been re- 

 corded from Bermuda for some years. 



