APPENDIX, 209 
APPENDIX. 
THE STRUCTURE OF THE BUD-LIKE ORGANS OF 
MALTHOPSIS SPINULOSA GARMAN. 
By EMANUEL TROJAN. 
Among the Albatross fishes sent to Professor von Lendenfeld for exami- 
nation was a specimen of Malthopsis spinulosa Garman. ‘This fish is pro- 
vided with peculiar bud-like sense organs, which, on account of their function 
apparently not being a radiating one, were not described in Professor von 
Lendenfeld’s report. Professor von Lendenfeld entrusted me with the 
examination of the minute structure of these organs. The results are given 
below. 
Garman (1899, pp. 106, 107, Plates XX, X XVI) has described and figured 
d, the tail has a circular 
The lateral line 
continued on 
this species. ‘The body is dorsoventrally compresse 
transverse section. Thorn-like scales cover the surface. 
extends along the narrow lateral margin of the body, and is 
the tail. It appears as a distinct lateral furrow. The margins of this 
furrow bear fringes. In the furrow itself a row of bud-like protuberances 
is observed. Above and below each one of these a lobular excrescence with 
fringed margin is met with. The fringes of the margins of the furrow and 
the lobes are composed of filiform parts, richly pigmented and dark in color. 
Garman’s description and illustrations of the bud-like protuberances are insuf- 
ficient. He mentions them only from the lateral line and the symphysis 
below the mouth. Closer inspection shows that they also occur on the head. 
There are on each side (text figs. 1, 2): in the lateral line (furrow) of the 
body 12 ventral (v); between the 9 and 10 of the lateral line, one above 
the other, 2 lateral (1); in the lateral line of the tail 12 caudal (c); ina 
4 mandibular (m); in a line 
horizontal row behind the corner of the mouth 
(x); between the 4 
parallel to and above the preceding one 7 maxillary 
organs of the two last named rows | inframaxillary (i); and on the lower 
jaw 4 inframandibular (n); together 84 bud-like organs. 
The bud-like organs are cream colored, button-shaped, and composed of 
a short, stout, cylindrical peduncle only 70 long and on a semispherical 
head 400-500 p» in diameter. The histological structure of these organs can 
best be made out in longitudinal, axial sections (Fig. 3). The corium is very 
highly developed and covered by a pavement epithelium with large nuclei as 
in other parts of the skin. It forms two different kinds of papillae. In the 
one the corium predominates and the epithelium is only slightly developed, 
14 
