32 



TABLE 2. 



Characters in which the Colony or Ascidio-zooid of A. pellucidum and A. con- 

 stellatum are Diverse, listed in Parallel Columns. 



Character 



Amaroucium pellucidum 



Amaroucium constellation 



External appear- 

 ance of colony- 



Gelatinous test densely 

 and evenly coated with 

 sand. 



Gelatinous test smooth and 

 clean. 



Size of colonies 



160 to 200 mm. in diameter. 

 70 to 90 mm. in height. 



Occasionally 80 mm. in 

 diameter and 30 to 50 mm. 

 in height. Usually 10 to 

 25 mm. in diameter and 

 10 to 25 mm. in height. 



Lobules 



Lobules entirely separate 

 except at bases. Each 

 lobule with a single circu- 

 lar or oval system of zooids 

 and with a cloaca! orifice 

 in the center. 5 to 10 mm. 

 in diameter at the end. 



Lobules fused. Systems of 

 zooids occasionally circular 

 or oval but usually irregular 

 and extensive, their limits 

 difficult to make out. 



Size of zooids 



Frequently attaining a 

 length of about 20 to 25 

 mm. Longer and slenderer 

 than those of A. constella- 

 tum. 



Average length of about 

 14 mm. 



Color of zooids 



Stomach bright orange- 

 red, other parts incon- 

 spicuously colored. 



Zooids orange-yellow. Ori- 

 fices, siphons and upper 

 part of mantle bright 

 orange or lemon - yellow, 

 branchial sac flesh-colored 

 or pale yellow, sometimes 

 bright orange. Stomach 

 with bright orange-red 

 longitudinal ribs. Intestine 

 light orange. 



No. of stigmata 



12 to 14 transverse rows. 



9 to 11 transverse rows. 



Habitat 



Not found on piles of 

 wharves. 



Common on piles of 

 wharves. 



Range 



Vineyard Sound to North 

 Carolina. 



Gloucester, Massachusetts, 

 to Cold Spring Harbor, 

 New York. 



