212 SCIENTIFIC RESULTS OF THE 
The openings of the rhinophor-holes and of the branchial area (fig. 
366) surrounded by large and small tubercles which also were spread 
over the central part of it (fig. 3). The branchial leaves (fig. 3aa) were 
about twenty-four or twenty-five in number, set in a transverse reni- 
form ring; the leaves in the front part much larger than the rest. 
The anus as usual, scarcely projecting. The under side of the margin 
of the mantle quite smooth. The genital openings always quite con- 
tracted. The foot large, with a fine line along its anterior margin. 
The cerebro-visceral ganglia short-reniform; the pedal ones not 
much smaller, of oval form, set nearly at a right angle to the inferior 
face of the former; the olfactory ganglia bulbiform or ovoid. The 
buccal ganglia rather flattened, of roundish contour, a little larger than 
the olfactory ones; the commissure between them very short; the 
gastro-cesophageal ganglia not very short-stalked, roundish, in size 
about one-quarter of the buccal ganglia, with three large cells. The 
three commissures very distinct, the sub-cerebral and the pedal con- 
nected throughout most of their length; the visceral thin, not giving 
off a genital nerve. 
The eyes with black pigment, yellowish lens; the nervus opticus 
nearly as long as halt the breadth of the cerebral ganglion. The 
otocysts as large as the eyes, crowded with otokenia of the usual kind. 
The leaves of the rhinophoria without spicules ; the axis of these organs, 
on the other hand, were filled with such spicules, partly circularly and 
concentrically arranged. The tubercles of the back stuffed with ordi- 
nary spicules (fig. 10) in the usual way, the larger spicules mostly very 
prominent on the surface. 
The oral tube as usual. The bulbus pharyngeus of the usual form, 
about 2.0 mm. long ; the lip-disk with a rather thick yellowish cuticula, 
and inwards with the same belt of (about ten to fifteen) rows of small 
denticles as in the’ L. hystricina (cf. below) ; the sheath of the radula 
somewhat bent upwards, freely projecting behind the bdulbus for as 
creat a length as that of the bulbus itself. The tongue (in the three 
individuals) with ten or eleven series of plates, in the sheath ten or 
eleven developed and three younger rows ; the total number of rows being 
thus twenty-four or twenty-five. The plates light yellowis in their 
thicker parts, otherwise nearly colorless. The length of the median 
plates reaching about 0.12 mm., the height of the external ones 
0.10 mm. The median (fig. 7a) and exterior plates (fig. 72) quite as 
usual ; the large ones of the usual forms (fig. 75’, sometimes, especially 
