PACIFIC COAST OLIGOCH ATA. 129 
pears as a veritable cuticle, though I can find none above the pellucid cells. In 
fact the whole structure of these organs is very much the same as the sense organs of 
the epidermis of the body-wall. In connection with them I may point out the simi- 
larity of structure of these organs with those described below in Acanthodrilus Vasliti, 
in the vicinity of the prostates; and with those in the tubercula pubertatis of Sparga- 
nophilus Smithi and tepicensis, in all of which I find the same sense cells. 
Tt remains to add that this pouch-like area of sense cells and glandular cells has 
previously been observed by both Michaelsen and Horst and designated as a diver- 
ticulum of the buccal cavity, but the true nature of the pouch as a sense-area has, I 
believe, not been previously recognized. 6. Bolavi, malayana and probably most, if 
not all other, Benhamias possess this organ of the buceal cavity. 
Septa. These are generally very thin, only two being thicker than the rest, 
viz.: Xil-xili and xili-xiy. These septa do not strictly correspond with the inter- 
segmental grooves, but are affixed much further back in the somites. 
Pharyngeal and septal glands. The usual supra-pharyngeal glands are present. 
They are evidently unicellular and arranged ribbon-like as will be directly described 
below. The septal glands are found in ix, x and xi, are very narrow and only one cell 
thick in the row as the former. These glandular masses are much thicker in B. 
palmicola, but not any longer. 
Intestine. In all the specimens which I could examine I found the pharyngeal 
parts strongly everted and protruded to such an extent that it formed the lip or front 
margin of the body, taking the usual place of prostomium proper. I cannot ascribe 
this entirely toa simple protrusion of the pharynx, but believe that this part is actu- 
ally situated much more forward than in other species, as I found it to be the case in 
every specimen observed. ‘The pharynx was found actually on the outside of the body 
(figs. 15, 16, 17, 18). The real pharynx, of course, is the zone in which open the 
supra-pharyngeal glands. The wall of this part is in our present species hardly 
thicker than those of the buccal cavity and the cesophagus, but it contains the usual 
arrangement of narrow epithelial cells, between which penetrate the fine ducts from 
the supra-pharyngeal glands. The ends or discharge pockets of these glands are 
almost globular or rounded flask-like (fig. 18). The supra-pharyngeal glands are 
arranged as ribbons, running singly along muscular strands. They differ from similar 
glands in Pontodrilus, Pheenicodrilus, Ocnerodrilus ete., by their arrangement in 
single rows, and here and there the duct of a single glandular cell may be followed 
clear to the discharge pocket (fig. 16). These glands appear to consist of a single 
cell with a long duct, just as the corresponding glands in Euchytr:eus, described by 
Hesse. But to draw the conclusion from this fact, that all the pharyngeal and septal 
glands are unicellular is, I think, premature. In Pontodrilus, at least, there 
may be seen plainly numerous nuclei on the gland duets, which, of course, indi- 
cates that we here have a fusion of several cells. The pharyngeal glands in that 
genus do not show this ribbon-like ar rangement as in Benhamia. I could, however, 
see that some of the smaller glands nearest the pharynx consisted of only one cell, 
but the majority, and all the large glands, consisted of several cells, the respective 
