516 MAYNARD M. METCALF, 



Observe the dextral asymmetry shown in the position of the ciliated 

 funnel and its duct and nerve (Fig. 19). 



The Styelinae. 

 I have studied four species in this sub-family — Polycarpa glo- 

 merata Ald., Polycarpa varians Heller, Styela plicata Les. and a 

 species which Stimpson has named Cynthia partita^ but which seems 

 to be an American variety of Styela aggregata 0. F. M., distinguished 

 from the European form chiefly by its duller color. Of the other six 

 genera of this sub-family I have had no representatives. 



Styela plicata Les. 

 Plate 36, Figs. 24 and 25. 



From the very large, coiled, ciliated funnel the duct leads up to 

 the right of the anterior siphonal nerves into the gland which lies 

 on the dorsal surface of the ganglion. The gland is large and presents 

 the usual appearance. Posteriorly its cells grade off into those of the 

 ganglion (Fig. 25 f). Just in front of this point of fusion the rapheal 

 duct arises from the gland and running down to the right of the 

 ganglion passes into the dorsal raphe, stretching down about one- 

 third of the way to the oesophageal opening, there to end blindly. 

 It is a simple tube with no swellings and no collections of glandular 

 cells in its lumen (Fig. 25 r.d). 



A gangliated nerve cord is also present in the raphe, having the 

 usual relations (Figs. 24 and 25 r.n). 



Styela aggregata var, americana (?) 



This is the species which on the New England coast is commonly 

 called by Stimpson's name Cynthia partita. It is clearly a Styela and 

 except for its duller color seems to agree with the description of the 

 European Styela aggregata 0. F. M. 



In the character of its intersiphonal organs it so exactly resembles 

 Styela plicata Les. that there is no need of any description. I will 

 call attention only to the great size of the gland. 



JPolycarpa glomerata Ald. 



Plate 36, Figs. 26—28. 



The ciliated funnel in this species is in the form of a trumpet 



with its posterior part bent sharply to the right (Fig. 26). Where 



it touches the base of the right anterior siphonal nerve the latter 



