THE ASCIDIANS 



239 



STYELA YAKUTATENSIS sp. nov. 



(PI. XXVII, figs. 20 and 21.) 

 General characters. — A pedunculate species with the following 

 measurements : 



These averages give : 



Length of body = i.S X length of peduncle. 

 Depth of body = 1.3 x thickness of body. 



Outlines are shown in p1. xxvii, figs. 30 and 3i. 



Transition from body to peduncle usually, though not always, rather 

 abrupt. Surface but little corrugated or roughened, usually free from 

 foreign bodies. Siphons rather small and short, the branchial directed 

 forward, the atrial turned ventral ward. 



General color light with a distinct tinge of yellow ; the •siphons and 

 a small area around them deep salmon, the color, however, entirely 

 disappearing in alcoholic specimens. 



Test rather more delicate and transparent than usual for species of 

 this genus, the intestine showing through it even in nearly full grown 

 specimens. 



Branchial apparatus. — Form and proportions of siphons described 



