EEPOET OH THE HUDIBEAHCHTATA. 
103 
height of the plates increased gradually to '3 mm., while the innermost of all (fig. 18, a, a) 
were only about ’1 mm. The shape of the teeth was as usual (PI. III. fig. 6). The 
three outermost (PL II. fig. 19) had a very shortened body ; the outermost (figs. 19, a, a, 20) 
upright, with a somewhat variable shape. 
The salivary glands were about 2 '8 cm. long and somewhat bent in the middle, the 
hinder end only reaching a short way beyond the large common commissure ; in the 
most anterior part (PI. III. fig. 11,6) they were yellowish in colour for an extent of about 
6 mm., 2 mm. broad, and somewhat flattened; for the rest of their length (fig. 11, a) they 
were white and somewhat flattened, narrower in the hindermost portion, about *3-'4 mm. ; 
the cavity of the gland was quite narrow. The ducts short. 
The oesophagus about 2 '3 cm. long with a diameter of l'5-2'3 mm. behind, and a little 
before its junction with the stomach the width was slightly greater (fig. 3, a) ; the interior 
bad fine longitudinal folds. The sac-shaped stomach (fig. 3, 6) extends some way in front 
of the cleft of the liver, and is about 1*5 cm. long by 1'2 cm. in breadth and '8 cm. 
in height ; its cavity communicates with that of the liver (fig. 3, d) by a very wide 
aperture; the interior is covered with close, low, longitudinal folds. The intestine takes 
its origin from the anterior end of the stomach (fig. 3, c), it immediately bends to the right, 
resting upon the oesophagus and anterior genital mass, then posteriorly it traverses a 
winding furrow upon the liver; its total length when fully extended is 6 cm., with a 
constant breadth of 2-2 • 5 mm.; the interior is covered with fine folds. The alimentary 
cavity was filled with the debris of food, generally consisting of indistinguishable animal 
remains, but sometimes of masses of sponges and Radiolaria-like convex bodies of 1'5 mm. 
in diameter.— The posterior visceral mass (liver) is 2 - 3 cm. long by 1'6 cm. in breadth and 
1*4 cm. in height; the hinder end is rounded and truncate ; the anterior end is obliquely 
inclined from above forwards and downwards, and hollowed out to receive the stomach ; 
beneath on'the right it has a facette for the anterior genital mass. About the middle 
line is the furrow for the intestine, and along its left margin the furrow occupied by the 
urinary chamber. The liver is darker inside than out, its colour is dirty yellow. The 
cavity has numerous wide crypts filled with food debris. The gall-bladder is of the 
same colour as the liver, pear-shaped, and situated on the left side of the stomach; it is 
5 ‘5 mm. long, with an average diameter of 2 mm. on the surface of the liver (the roundish 
facette is here somewhat sunken in the middle). 
The pericardium is large and roundish ; its length is 12 mm. and the breadth about the 
same ; the walls thicker than usual (pathological V), especially thickened round the margin. 1 
The ventricle of the heart is 6 mm. long, and its upper surface covered with epithelial 
villi (fig. 10) of various size, found also on the auricle, and reaching a length of ‘5 mm. ; 
the two atrio-ventricular valves being strongly developed and the musculature of the 
1 In the pericardium I found the much mutilated female of a parasite belonging apparently to the genus Briarella, 
formerly instituted by me (Malacolog. Untersuch., loc. cit., Heft x., 1876, p. 408, Taf. xlix. figs. 11-13) from a specimen 
