120 IOWA STUDIES IN NATURAL HISTORY 



and 33 (of which 18 are bleached, bare tests) from English Har- 

 bour, Antigua. The smallest specimen is 7 mm, long by 5 mm. 

 wide; the largest is 35X29 mm. The form of the test shows 

 much diversity, the width ranging from .66 to .77 of the length 

 and the height from .39 to .48. 



AGASSIZIA EXCENTRICA 



A. Agassiz, 1869. Bull. M. C. Z., 1, p. 276. 1883, Mem. M. C. Z., 

 10, pi. XXV. 



Twice during the dredging off Barbados, the bare dead tests of 

 this species were met with. All are small, ranging from 5.5 to 

 9.5 mm. in length; the largest is 8.5 mm. wide and 8 mm. high. 



Station 48. May 27, 1918. S. W. of Lazaretto, W. by N. of 

 Pelican Island, 25-72 fms. Coarse coral sand. Dredge. 

 3 specimens. 



Station 77. June 3, 1918. Cable station bears 31/2 S. 1 mile 

 off shore. 40-50 fms. Dead bottom — coarse sand. 2 

 specimens. 



BBISSUS BRISSUS 



Spatangus brissiis (var. imicolor) Leske, 1778. Add. ad Klein, 



pp. XX, 182. 

 Brissus brissus H. L. Clark, 1917. Mem. M. C. Z., 46, p. 218. 



This spatangoid, almost always found associated with EcMno- 

 neus, was not taken at Barbados, although it is recorded from 

 that island and probably occurs there. From Antigua there are 

 48 specimens, of which 4 are bare tests. One was taken at the 

 Pillars of Hercules but all the others are from English Harbour. 

 The smallest specimen is 22 mm. long, 17 mm. wide and 11 mm. 

 high, while the largest is 61X45X36 mm. One specimen is 

 peculiarly deformed, as a result of a serious injury at some time 

 in interambulacrum 4, which is now entirely healed; this speci- 

 men measures 42X35X25 mm. In the Narrative (pp. 190-192), 

 Professor Nutting discusses in a very interesting way the pecu- 

 liar subsurface habits of Brissus and Echinoneus. My own ob- 

 servations of these species agree well with those of the Iowa 



