130 CAI.IFOKNIA ACADK.MY OK SCIENCKS. 



ducts of which finally uiiitefl into one. In Benhaniia T could see no such union, and 

 the single duels could be followed with great facility to the outlets. Fig. 17 repre- 

 sents some of these cells with three narrow ducts and secreted matter. 



(EaophfKjHx, following pharyngeal division, is very long. The upj)er part, im- 

 mediately below the pharyngeal gland, is very thin-walled, consisting of only one 

 strand each of transverse and longitudinal muscles, and line<l t)y a very narrow epi- 

 thelium (fig. 19). Posteriorly the walls of the (esophagus thicken considerably. The 

 two distinct gizzards are in viii and \x, as usually connected by a very thin wall of 

 the same general nature as wsophagus (fig. 7). The muscles of the gizzards are 

 columnar ])ut not bipinnatoly arranged, the rihitoiis running ])arall(d with the short 

 diameter of the body (figs. 7 and 21). 



The tubular intestine extends through somites x to xiv, being of irregular out- 

 line. Sacculated intestine commences in xv, and is furnished witli a typhlosole in 

 somites xviii to xxiii, or thereabout. 



K|)itlielial colls of the alimentary canal surround glands of various forms. In 

 the epithelial lining of the gizzard we find club-like glands (fig. 21 (jl.) consisting 

 each of one (seldom of more) large cell with round nucleus, a narrow duct reaching 

 between the epithelial cells, and ending with a large chamber, in very much the same 

 way as the pharyngeal and septal glands. 



In the narrow thin walled part between the two gizzards I find a few clusters 

 of glands (?) similar to those I have described in Argilophilus. At the bottom of the 

 cluster we find a glandular cell, upon which are butting the })eculiar lunate cells, 

 which again surround a lumen, which is much wider than in the corresponding organ 

 in Argilophilus (fig. 22 ql. and c.) The lining of the sacculated intestine and the 

 typhlosole arc composed of three distinct kinds of cells, two of which are glandular 

 (figs. 24 and 25.) The common epithelial cells offer nothing of particular interest. 

 The glandular cells are of two distinct kinds (fig. 25). One kind is the one most 

 common in oligocha'ta (fig. 25 <//.) and its enclosed granules are much smaller. The 

 other kind is probably identical with the T-shaped cells described by Benham in 

 Eminiodrilus, though tin; T-shaped form is not (luite so prominent. The granulation 

 is coarse and highly refractive and the distal part of the cell stains intensely, especially 

 with methyl green. The other or first mentioned glands remain at the same time un- 

 affected by this stain. These dark staining cells are much less luimerous than the 

 other kind, and are scattered about in a rather regidar way. Fig. 24 /* rei)re.sents 

 one of the lobes of the typhlosole, showing the absence of glands at the apex as well 

 as the general distribution of tli(' dark staining cells. 



Calciferuus diverticula. I found in the two specimens dissected and sectioned 

 only two pairs of calcifcrous glands in somites xv and xvi, but \ am unable to .say if 

 this will be found constant, as all other species of BiTihanjia possess three pairs 

 of calcifcrous pockets, which Beddard claims are characteristic ol tiiis genus. 

 Michaelsen's observation that the two diverticula are of difTereiit nature is confirme<l 

 here, as in tlu; posterior j)air no lime crystals were found, either in this or in the other 

 species described below. Also the histological structure of tiie posterior and anterior 



