fish. All specimens examined had the richly branched system of 
frontal” appendages inserted into the bulbus arteriosus, the latter 
being distended to such degree, that it far surpassed in size the 
ventricle (efr. Pl. I, Fig. 27 b and v). Nevertheless the infested 
specimens looked quite as healthy and well nourished as those 
free of the parasite. 
The three species of Peroderma all possess branehed åappen- 
BE dages from the front 
— 
mrs. end of the cephalotho- 
1 . cv . ig 
AR FR ):: guides, to Ri 
i ER 
chiardi's figures of P. 
cylindricum the distance 
between the second and 
third pair of swimming 
feet is very great, and 
sm om this interspace are 
found a pair of pecu- 
liar  Schitinous  ridges; 
no terga of abdominal 
Pigt 1. Peroderøte: bellottis. segments are mentioned 
Part of ventral side of body, between the two or figured. == Regarding 
large lateral outgrowths. p,—p2: first to third 
pair of abdominal (thoracic) feet; p,?: rudi- 
mentary structure, perhaps representing the not been figured, it is 
right foot of a fourth pair. said that 4 pairs of 
P. petersi, which has 
feet are present, following each other at short distances, and that 
the egg-strings are ”spirally directed ” (after these statements the 
species seems to me somewhat doubtful as a member of the genus 
1) C. B. Wilson has (238, p. 458, Pl. LXXVI, Figs. 99—100) described a 
"Lernæenicus medusæus” taken on Nannobrachium leucopsarum at 
Monterey, Calif, which may belong to the genus Peroderma, as it 
ery much resembles P. bellottii. But it is said to possess only 2 
pairs of swimming feet, with single rami, and the author adds: 
"No other appendages are visible”, and that no sipho is to be seen, 
ese statements seem to me somewhat doubtful. The place on the 
host is not mentioned. 
