68 PROCEEDINGS OF THE ACADEMY OF [1880. 



missura pedalia nearly as long as the diameter of the pedal ganglia ; 

 the subcerebral lying rather close up to the pedal ; the visceral quite 

 free, much thinner. A very short-stalked smaller ganglion (fig. Ic) 

 connected with the under side of the right visceral ganglion, gives off 

 a nerve that swells into a new ganglion, which sends out three nerves 

 (N. genitalis). The olfactory ganglia short-stalked, spindle-shaped. 

 The buccal (fig. Id and the gastro-oesophageal ganglia (fig. le), nearly 

 as in the L. hystricina ; the commissure between the first extremely 

 short, the gastro-oesophageal somewhat smaller. 



The nervi optici one to one and a-half times as long as the diameter 

 of the cerebral ganglia ; the eyes with black pigment, yellowish lens. 

 The otocysts (fig. 1) lying rather backwards, a little smaller than the 

 eyes ; the otokonia of the usual form, in number about fifty. The 

 leaves of the rhinophoria without spicula. In the skin were almost 

 no spicula and no larger or calcified ones on the surface of the rigid 

 papillag of the back, which thus were rather smooth. In the intersti- 

 tial connective tissue small calcified cells, but no larger spicula. 



The mouth-tube as in the L. hystricina. The bulbus pharyngeus 

 as in that species, but the sheath of the radula shorter and less 

 prominent, bent upwards, sideways or down and forwards. On the 

 intei'ior part of the nearly colorless labial disk, the usual belt of 

 (about twelve to fifteen) rows of small denticles. The tongue strong, 

 rather long, with curved superior and nearly straight inferior margin. 

 In the mature radula twelve to fourteen or sixteen rows of teeth, 

 further backwards fifteen or sixteen to eighteen rows of developed, 

 and three of partly developed teeth ; the total number of rows thus 

 thirty, thirty-one or thirty-five to thirty-seven. The median plates 

 (fig. 14) of nearly the usual form, in the under side rather excavated, 

 with thickened margins. The large lateral plates (fig. 13) formed 

 nearly as in the L. hystricina, but larger, reaching a height of 0.12 

 mm. ; the denticulation of the interior margin of the hook stronger, 

 with more (about twenty) denticles and reaching farther out towards 

 the end of the hook. The exterior plates nearly of the same form as 

 in the last species, reaching to the height of about 6 mm. 



The sucking-crop quite as in the former species. 



The salivary glands much smaller than in the former species, re- 

 duced to a large, scarcely lobed, whitish mass on each side of the 

 root of the ojsophagus. 



The oesophagus somewhat spindle-shaped. The stomach included 

 in the liver. The intestine issuing from the liver behind its middle- 



