130 CALIFORNIA ACADEMY OF SCIENCES. 



ducts of which finally united into one. In Benhamia I could see no such union, and 

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

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



G£sophn(ju», following pharyngeal division, is very long. The upper part, im- 

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

 strand each of transverse and longitudinal muscles, and lined by a very narrow epi- 

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

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

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

 columnar but not bipinnately arranged, the ribbons running parallel 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 with a typhlosole in 

 somites xviii to xxiii, or thereabout. 



Epithelial cells of the alimentary canal surround glands of various forms. In 

 the epithelial lining of the gizzard we find club-like glands (fig. 21 gl.) 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 peculiar 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 are 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 oligochieta (fig. 25 gl.) and its enclosed granules are much smaller. The 

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

 Eminiodrilus, though the T-shaped form is not quite 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- 

 aflfected by this stain. These dark staining cells are much less numerous than the 

 other kind, and are scattered about in a rather regular way. Fig. 24 b represents 

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

 as the general distribution of the dark staining cells. 



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

 only two pairs of calciferous glands in somites xv and xvi, but T am unable to say if 

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

 of calciferous pockets, which Beddard claims are characteristic of this genus. 

 Michaelsen's observation that the two diverticula are of different nature is confirmed 

 here, as in the posterior pair no lime crystals were found, either in this or in the other 

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



