BIOLOGICAL SURVEY OF WOODS HOLE AND VICINITY. 



733 



Amaroucium pellucidum form constellatum ( Verrill). 

 [Chart 196.] 



Verrill, iSyia, p. 359 (Amouroucium constellatum, 

 sp. nov.); Verrill, 1872 (Amouroucium constel- 

 latum); Verrill and Smith, 1873, p. 704, 388, 

 etc. (Amaraecium constellatum); Bumpus, iSgSb 

 (Amaraecium constellatum); Van Name, 1910, 

 p. 406. 



Abundant and generally distributed in the east- 

 ern half of Vineyard Sound ; elsewhere in the 

 Sound, and in Buzzards Bay, it is almost 

 wholly confined to the inshore stations; 

 dredged in i to 15 fathoms, on bottoms of sand, 

 gravel, and stones. Survey. Likewise com- 

 mon on piles in Woods Hole Harbor, Vineyard 

 Haven f and Edgartown.f 



Fish Hawk stations: 7521 bis (many clumps), 

 7522f (several masses) , 7522 bis (several 

 clumps), 7523 (several masses), 7523 bis (few 

 masses), 7524 bis (i mass), 7526 (i small piece), 

 7527 (abundant), 7528 (many), 7530 (several 

 masses), 7531 (3 small), 7532 (few), 7532 bis 

 (i), 7536 bis (i small piece), 7537, 7538 (several 

 pieces), 7539 (several masses), 7540 (few 

 .masses), 7544 (i clump), 7547 (few), 7549 bis 

 (i small colony), 7553 bis (few colonies), 7557 

 (few small pieces)f a , 7588 (2 pieces), 7595 (few 

 pieces), 7619 (2 masses), 7645 (i small colony), 

 7737 (i large clump), 7738 (several colonies), 

 7739 (little), 7740 (little), 7746 (little), 7748 

 (little)f, 7749 (much), 7750 (much), 7751 

 (much), 7752 (common), 7754 (much), 7758 

 (little), 7759 (little), 7760 (little), 7761 (little), 

 7763 (much)t, 7764 (little), 7765 (little), 7766 

 (very little), 7767 (little)t, 7768 (much), 7769 

 (little), 7770 (i small piece), 7772 (very little), 

 7773 (little), 7775 (little), 7777 (little), 7781 

 (little). 



Phalarope and Blue Wing stations: i (few pieces) 

 2 (few), 3 (few), 9 (i colony), 10 (2 colonies), n 

 (common), 12 (several pieces), 14 (i colony), 

 22 (few), 24 (i colony), 25 (few), 30 (i mass), 32 

 (few pieces)?, 34 (few), 44 (scarce), 45 (many 

 small), 46 (few small masses), 51 (few), 56 (few), 

 57 (few), 58 (few), 62 (several), 63 (many), m 

 (young colony), 112, 113 (small colony), 118 

 (few colonies), 121 (several), 130 (few), 131 

 (few), 135, 136 (few). Supplementary station 

 (1909): 83 (? i mass). 



Found frequently to contain large ova and em- 

 bryos in July. F. W. Bancroft, cited by 



Amaroucium qlabrum Verrill. 



Van Name, 1910, p. 410. 



Vineyard Sound, near Cuttyhunk, at Fish Hawk 

 station 7689! (9 fathoms, sand, and stones). 

 Certain other specimens were referred by 

 Prof. Ritter to this species, but are assigned to 

 A. pellucidum constellatum by Dr. Van Name. 

 We have adopted the identifications of the 

 latter authority in the case of the composite 

 ascidians. 



Amaroucium stellatum Verrill. [Chart 197.] 



Verrill, 1871, p. 291 (Amouroucium stellatum, 

 sp. nov.); Verrill, 1872; Verrill and Smith, 

 1873, p. 704, 402, etc. (Amaraecium stellatum); 

 Bumpus, iSgSb (Amaroucium stellatum); Van 

 Name, 1910, p. 416. 



Abundant and generally distributed throughout 

 most of Vineyard Sound, though apparently 

 wanting in the deeper parts at its western end; 

 Crab Ledge, at several stations; not recorded 

 from Buzzards Bay; dredged in 4*2 to 17 fath- 

 oms, on bottoms of sand, gravel, and stones. 

 Survey. This species does not appear to occur 

 in such shallow waters as the preceding, though 

 the two are frequently taken together at mod- 

 erate depths. The)' both form extensive col- 

 onies, which commonly are readily distin- 

 guishable from one another by their general 

 appearance. A. stellatum has been collected 

 by V. N. Edwards in shallow water at Sheep 

 Pen Cove, though such specimens had perhaps 

 drifted in from deeper waters. It is frequent 

 in drifted material on Nobska Beach. Living 

 specimens have been taken in January by 

 both Mr. Edwards and Mr. Gray. 

 Fish Hawk stations: 7523 (several masses), 7525 

 bis (many masses), 7526 (few small pieces), 

 7527 (abundant), 7528 (many), 7530 (several 

 masses), 7531 bisf, 7532 (few), 7532 bis (many), 

 7535 ( few ). 7537 (several pieces), 7538 (many 

 masses), 7539 (few masses), 7541 (few masses), 

 7541 bis (few), 7542 (many long and rope-like 

 masses), 7542 bis (several living colonies), 7543 

 (2 pieces), 7543 bis (several masses), 7544 (sev- 

 eral pieces), 7545 (few small pieces), 7547 (few 

 pieces), 7548 (many pieces), 7550 bis (?),755i 

 (i piece)f, 7552 (few pieces), 7553 (few pieces), 

 7554 (several pieces), 7554 bis (numerous col- 

 onies), 7556 (i ropy mass), 7558 (many masses), 

 7560 (several pieces), 7561 (few masses), 7579 

 (3 large pieces), 7580 (i mass), 7594 (i large 

 piece), 7603 (few small)*, 7605, 7606 (few), 



Bumpus. 



a Specimens from stations 7522 and 7557 were identified as A. gl-i^nun by Prof. Ritter, in the first case doubtfully. Dr. Van 

 Name, after examining the same specimens, dissents from these detcrmiuati-ms. In the present report we have consistently 

 followed Dr. Van Name's identifications for all the composite ascidians submitted to him. 



