NEW MALI.olMlACA. 215 



uutt T eovei'iiifj; of muscles is lacking. Eacli is a long 

 slender tube dilatetl where it eoutains ova into elvim- 

 bers whith decrease in size distally. 'IMit- five tubes on 

 (uicli side are united at lluir anterior ends and form a 

 tantrk'(l mass on each sid(? of the bodv. l^adi tube 

 (plate xvi, liii;. 0) is surrounded by a close, outer, struct- 

 ureless membrana proi)ria (inj>). Within this is an 

 epithelium composed <>f a single layer of cells. When 

 there is no egg present in the ovary these cells are all 

 very large (plate xvii, tigs. 3-5, <>) and almost fill the 

 lumen of each tube. They appear triangular in trans- 

 verse sections, while their 1)ases on the membrana 

 propria arc polygonal. A large, radially elongated 

 nucleus is present in each. When ova arc i>resent in 

 the ovaries the egg-tubes [iresenl a very different 

 appearance (plate xvi, fig. 0). Each egg is surrounded 

 by a follicle formed by an enlargement of the tubule. 

 In the lower chambers {n) are to be found fully formed 

 6ggs (o). They are surrounded by a thick egg-cover- 

 ing filled with granular yolk. In form they are elon- 

 gated and llattened at each cud. The epithelium ((7') 

 of the walls of a lowermost egg-chamber is composed 

 mostly of small cubical cells. Posteriorly they are 

 elongated, forming a transverse posterior wall for the 

 chamber in the middle of which is the opening into 

 the proximal juirt of the tubule connecting the egg- 

 chambers with the oviduct. In front the epithelial 

 cells become successively longer, until the most anterior 

 are very long and slentler. those from opj)osite sides 

 alino>t meeting one another. In front of these are 

 fonr immensely enlarged cells [iic) entirely tilling the 

 lumen of the tubule and thus closing the anterior end 

 of the eesf-ohamber. These retain the form of the cells 

 of an inactive tubule. The small" epithelial cells are 



