66 Journal of Entomology and Zoology 
system. There are no concentrations any place to form a ganglion; 
the chief nervous system lies ventrally. Two longitudinal nerve 
tubes or nerve bands are described running the length of the body. 
The nerve strands may give the appearance of tubes due to shrink- 
age; epithelial cells seem to compose it and the tissue does not look 
like nervous tissue. These longitudinal tubes or nerves may be 
some sort of sense organ. 
Cori, 1890, adds nothing to the general knowledge of the nerv- 
ous system. 
Torrey, 1911, in P. pacifica gives a partial description of the 
nervous system as like that of P. architecta with the exception that 
“The two longitudinal cords which are of exceedingly unequal 
length, instead of continuing in the nerve ring of the lopophore, are 
continuous across the median line at the level of the median mass 
of ganglion cells. The loop thus formed is closely applied to the 
latter and touches the lophophore nerve on each side of the rectum, 
apparently without fusing at either point.”” I have found no such 
condition in several good series of well stained Phoronis pacifica. 
Hither this was an individual difference or Torrey’s material was 
poorly fixed. 
Schultz, 1903, discusses the regeneration of the central nervous 
system. 
De Selys-Longchamps, 1907, described the circular nerve ring 
and ganglion and the lateral nerve of Caldwell on the left. 
Pixell, 1912, discusses two new species of Phoronida. 
In Phoronis vancouverensis, there is the usual ring of nervous 
tissue at the base of the lophophore; from it five nerves continue up 
the tentacles. Across the dorsal surface in front of the anus is a 
large ganglionic mass composed of fibers and cells with large nuclei. 
This tissue is everywhere in intimate relation with the inner ends 
of the epithelial cells. In some sections two small lateral nerve 
cords ran along the right and left sides of the body close to the 
point of attachment of the lateral mesenteries and projected into 
the basement membrane. He describes these as, ‘“punctated tis- 
sue.” They are very short. Nervous tissue was found in the 
center of the pit at the proximal end of the body and also along the 
alimentary canal on the outer side of the epithelium especially 
marked in the region of the oesophagus opposite the nerve ring. 
Gilchrist, so he says, suggests this patch as an organ of taste. 
Phoronapsis hamesi has a similar condition of the nerve ring 
but the ring is narrower and more elongated than in Phoronis. A 
conspicuous nerve cord extends down the left side. In the neph- 
ridial region it is separated from the epithelium and embedded in 
the basement membrane; after passing internally to the nephridial 
duct it turns outwards and rejoins the epithelium a little to the 
oral side of the lateral mesentery. From here it extends as a con- 
