PATELLA-PATINA. Ill 



P. TELLA Bergli. PI. 51, figs. 12-26. 



Under this name Bergh has given tlie following description and 

 figures of the soft parts of a specimen, the shell of which had been 

 detached and lost. 



The body measured in length 8*5, breadth 5 mill. The sole of 

 the foot (fig. 14) is oval, 8 mill, long, 4] broad. The color is light 

 brown, the sole having a median longitudinal band shining like a 

 tendon, not quite reaching to the posterior end. Tlie foot was very 

 strong, having a narrow fringe except at the head and behind, but 

 not scalloped as it is in P. pellucida. The branchial cordon is inter- 

 rupted in front. The head is strong, exactly similar to that of P. 

 pellucida. At the three-cornered, kidney-shaped anterior end (fig. 

 13) is the broad three-cornered mouth, and behind it the oblique, as 

 if cleft, front end of the buccal mass. The tentacles were pretty 

 short, quite cylind,rical (figs. 12, 13), similar to those of P. pellucida. 

 Unlike the latter, the eyes were not visible through the iotegument. 

 On the upper side of the head the radula showed blackly through. 

 The mantle-margin shows none or slight trace of a clothing with 

 closely placed, short, tentacular bodies. The positions of anal and 

 infra-anal papillse could not be determined. 



Above in the mouth-opening projected the edge of the upper jaw. 

 The buccal mass was strong ; about 2.5 mill, long by 1.5 broad. The 

 form of the basal-plate of the jaw^ was not observed. The cutting 

 (anterior) plate (fig. 17) was lai'ge, 1'3 mill, broad, light brownish- 

 yellow, darker at the back margin, half-moon-shaped, a little nar- 

 rower in the middle than at the sides, with obliquely excavated . 

 anterior margin, thin back margin. The tongue was similar to that 

 of P. pellucida, strongly black-pigraented at the side areas. The 

 teeth had fallen off. The number of rows, however, seems to have 

 been 11. The odontophore sheath is very long, reaching over the 

 upper surface of the foot. The posterior end is lacking ; the remain- 

 der has a length of 7 mill., its middle brownish, the sides with a 

 peculiar greenish-yellow luster. In the sheath there are 38 devel- 

 oped, 2 nearly developed (lighter colored) and 6 colorless, unde- 

 veloped, transverse series of tooth-plates. The dentition agrees in 

 all important characters with that of P. pellucida, as figured by 

 Loven. In each row there are 12 teeth, the formula being 

 3(ii^°'^ii)i. On the rhachis there is in the middle-line (figs. 19, 

 20), a low, elongated, narrow (median) ridge, without cusp 

 (homologous with the rhachidian tooth in Ancistromesus), and on 



