134 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



of Cyclosalpa pinnata). It is connected with the fourth body muscle, 

 as shown in the figure. 



In front of this basal sphincter lies another, broader muscle which 

 is morphologically the posterior branch of the fourth body muscle, 



em. 



A 



B 



Fig. 123.— Pegea confederata, aggregated zooid: A, dorsal view; B, view krom right side. 



X \\ DIAMETERS. FROM SPECIMENS COLLECTED IN PHILIPPINE WATERS. (1>RAWN BY HOTT S. HOP- 

 KINS.) 



though it is, in Pegea, actually distinct from the latter. It runs 

 toward, but does not reach, the mid-ventral line of the base of the 

 atrial siphon, its ventral end turning slightly forward toward the gut, 

 suggesting the origin of the visceral muscle (v) in other forms (see 

 fig. 3, pi. 1, Cyclosalpa phi nata, and fig. 13, pi. 4, Cyclosalpa floridana). 



