25 183 



showed a distinct separation of their two parts, the roundish pedal ones were somewhat 

 larger than each of these parts. The commissures were rather short. The olfactory 

 ganglia were almost sessile, of a flattened bulb-shape, the buccal ganglia with a short com- 

 missure. 



The eyes were almost sessile, of a diameter of O'lS™ 1 . The otocysts (statocysts) 

 of a diameter of OOS 111111 , closely filled with otoconia of the common kind. The leaves of 

 the rhinophores were made stiff in the common way. The skin (of the back) contained 

 a numberless multitude of the common long spicules partly with crumbling content, partly 

 hardened in a glass-like manner, which also rose in the tufts ; their diameter rose to - 04 mm . 



The short, clumsy bulbus pharyngeus had a length of 2 - 5 mm , by a breadth and 

 thickness of 2 mm ; the strong, downwards bent radula sheath which projected on the lower 

 side, was almost of the same length as the bulb. The labial disk was covered by a strong 

 cuticle. The yellowish radula of the strong, rather broad tongue contained about 

 20 series of tooth plates, in the radula sheath were found about 30 series, so the total 

 number of series of tooth plates was about 50. On either side of the quite narrow rhachis 

 about 45 — 50 lateral plates were seen. These plates were yellowish, of the common hook- 

 shape; the length of the basal plate was about - 14 mm , the height of the hook about 

 0-i2mm ; t ] ie heights of the hooks of the six outermost ones were 0-05— 0-06— 0"075— 0'08 

 — Q'li™ 111 . The tooth plates (figs. 18, 19) were of the most common hook-shape; the inner- 

 most ones were upon the whole somewhat smaller; else they kept the same size almost 

 to the end of the series, where the basal plate was shortened and at last quite reduced, 

 while in the six last ones the feeble hook-point, as it were, was dissolved into a little flat 

 brush (fig. 20); the seventh plate, again, had the common hook-shape. 



The salivary glands were small (about 8™° long), thick, brownish; the effe- 

 rent duct scarcely shorter than the gland. 



The oesophagus had a length of 3™"; the almost globular stomach had a dia- 

 meter of 4 mm ; the intestine which issued backward from the upper side of the stomach, 

 and ran in a curve to the anal papilla, was 8 mm long. — The posterior visceral mass was 

 a little flattened, of a length of 8™™, by a breadth of 5 mm ; anteriorly it was broader, with 

 a cleft for the stomach, on the lower side to the right it was somewhat more flattened by 

 the anterior genital mass, chiefly formed by the yellowish brown liver; on the left side 

 of the stomach the yellowish biliary bladder projected with a facet of a diameter of (H™ 11 . 



The ventricle of the heart had a length of 0'9 mm . The brownish blood gland 

 situated before the central nervous system, was flattened, of oval contour, with the point 

 forward, of a length of 2™™. The pericardio-renal organ (the renal syringe) situated to 

 the right beside the base of the auricle, had a length of O.S 111111 . 



The thin layer of the hermaphrodite gland as usual; the efferent duct which issued 



