VOL. 2, PT. 2.] 



APPENDIX. 



189 



The neural glands (fig. 149) are about as in Apsteinia punctata, 

 but the ducts and their apertures are very wide. On the posterior 

 face of the ganglion on each side, there is a large outgrowth from 

 the ganglion (fig. 150) containing chiefly large cells like those in 

 the ganglion in the zone of origin of the nerves. Nerve fibers from 

 the ganglion run into these outgrowths, and from the outgrowths 



#SMiiifeS 



Fig. 1-19.— Apsteinia asymmetrica, adult aggregated form. An oblique vertical section through 

 one of the two neural glands and its duct. x 345 diameters. 



arise some of the nerves. These postero-lateral outgrowths recall 

 the lateral outgrowths from the ganglion of Ritteria hexagona (fig. 

 47, p. 71), but they do not contain rod cells as in the latter species. 

 They suggest comparison also with the large-celled outgrowths from 

 the ganglion of Cyclosalpa {¥ in fig. 7, B, p. 18), and like the latter 

 are not in contact with the neural glands. 



Fig. 150.— Apsteinia asymmetrica, aggregated zoSid, an oblique vertical section through the 



GANGLION. X 345 DIAMETERS. At y IS SHOWN ONE OF THE TWO LATERAL OUTGROWTHS FROM THE 

 POSTERIOR FACE OF THE GANGLION. 



It is evident that Apsteinia asymmetrica and A. punctata are very 

 closely related. The somewhat more elongated form of the intes- 

 tinal "nucleus" in the former suggests that it is probably the more 

 primitive. The greater asymmetry of its aggregated zooid points 

 in the same direction. (See the chart of relationships on page 158.) 



The manuscript of this appendix was completed in October, 1917. 



