108 UROCOPTJb. 



The pharynx is short, shaped as in the HelicicUe. The long, 

 slender salivary glands are united posteriorly. The right 

 gland excretes through the left duct, the left through the 

 right duct. The oesophagus is very slender (pi. 27, fig. 44). 

 The fore-gut is closely applied to the central axis, curves lat- 

 erally to pass into the stomach (pi. 27, fig. 45, st.), which is 

 white and somewhat over a whorl long. A short loop is 

 formed shortly beyond it (fig. 45, g2, g3), making the digestive 

 tract four-folded,, as is the rule in Stylommatophora. The 

 hind- gut (fig. 45, g4) follows the suture, being peripheral in 

 position. The liver (fig. 45, I) occupies the first two whorls 

 exclusively, and its lower lobe (removed in fig. 45) extends at 

 least two whorls further down, sharing the space with the 

 stomach and ovo-testis. 



The jaw (pi. 50, fig. 8, U. dautzenbergiana) is highly 

 arched, thin, composed of many narrow, subvertical, slightly 

 imbricating plaits, which converge downward, leaving several 

 short plaits in the middle. The number of plaits varies from 

 32 in U. elliotti to 56 in U. sanguined. 



The radula is long and rather narrow, varying more in 

 width than in length. Teeth are arranged in V-shaped trans- 

 verse rows, the apex of the V directed inward. The general 

 form of the individual teeth is shown in fig. 6 of plate 60, rep- 

 resenting the third left lateral tooth of Urocoptis ventricosa 

 seen from above, and fig. 5, the fourth lateral, in profile. 

 The basal plates (6) are quadrangular in general contour. 

 At the middle of the inner side of the plate the mesocone (m) 

 arises, usually bending forward as far as the posterior edge 

 of the basal-plate or further. In my figures the overhanging 

 portion of the cusp is shaded for the sake of greater distinct- 

 ness. At the posterior outer margin of the basal-plate the 

 ectocone (e) rises, also bending backward. The bases of the 

 two cusps are generally connected by a ridge on the face of 

 the basal-plate (r), but sometimes this is indistinct or want- 

 ing. The cusps are both long, though the ectocone stands so 

 erectly that in a view from above it is much foreshortened. 

 These structures are sufficiently shown in figures 1, 5 and 6 

 of plate 60. 



