APPENDIX. Zi 
in the other the reverse is the case. The papillae of the first kind are very 
numerous, they form the “ scales”’ ; those of the second are less numerous 
and smaller, they form the basal parts, that is, the peduncles of the bud-like 
organs here described. Hach bud-like organ is supplied with a nerve about 
70 w thick (Fig. 3 n) which traversts the layers of the corium. ‘These layers 
bend outward around it and thus form a tubule. Besides the nerve also 
the artery passes through this tube. The terminal thickened part, the head 
of the organ, consists principally of spindle-shaped connective-tissue cells 
with oval nuclei (Fig. 3 c) and blood vessels (Fig. 3 b). On entering, the 
organ the artery (Fig. 3 A) immediately divides to form a capillary network, 
These capillaries decrease in width from the centre towards the periphery ; 
the narrowest are 12 » wide. The capillaries unite to form a vein (Fig. 3 
This vein extends for a consid- 
erable distance subcutaneously and does not pass through the tube in which 
the nerve and the artery are contained. The branching of the nerve com- 
mences at a higher level than the branching of the artery, above the centre 
Just beyond the centre 
v) which has the same width as the artery 
v 
of the head. Its proximal parts bear no branches. 
of the head it splits up into several bundles of primitive fibres. These 
ramify and thus a mass of separate nerve fibres are produced, interlacing with 
the capillary blood vessel net which is densest at the apex of the organ. 
The final termination of the nerves could not be made out, on account of the 
specimen not being specially preserved for the purpose. A continuous cuti- 
cle covers the whole organ (ig. 3 t). 
Organs comparable to these have been described by F. Leydig (1850, 
p. 172, 1851, pp. 235-239) as “Nervenknipfe.” These differ, however, in 
several respects from the bud-like organs of Malthopsis examined by me. 
The differences in shape and size would not be important ; but the cylinder 
epithelium which forms a principal part of the “ Nervenknépfe,” and to which 
the authors attach so great an importance, is missing in the buds of Malthopsis. 
If we were to imagine the organs of Malthopsis covered by a sensitive 
cylinder epithelium they would be “ Nervenknipfe,” still, however, differing 
from those described by F. Leydig (I. ¢.) in some respects. Leydig found 
the “ Nervenknipfe” always in slime canals; whilst the organs of Malthopsis, 
are free, The “free lateral organs” described by F. E. Schulze (1870; p. 71), 
which might also be compared to the buds of Malthopsis, are superficial 
swellings in the floor of the lateral canals. According to B. Solger (1880, 
Plate XVI, Fig. 6) they are oval plates. Thus these organs also differ con- 
siderably from those of Malthopsis. Neither can the “ Nervenknipe”’ of 
Lepidoleprus coclorhynchus (Leydig 1850, pp. 235-239) be compared with them. 
’ is hardly applicable to the organs of Malthopsis 
The term “ Nervenknépfe’ 
because their heads are not endswellings of nerves, but composed of con- 
nective tissue and abundant blood vessels. In so much as they are richly 
