11 
by Richiardi (1875, 18 a). In tke meautime Coma lia had 
named the same parasite Taphrobia pilckardi (5) without describing 
it better; both Heller and Cornalia only had one specimen at tkeir 
disposal, and that of Heller was damaged. Rie hi ar di showed 
that this parasite at its anterior end is provided with a system of 
brauched appendages; he described antennæ, maxillipeds, swimming- 
feet etc. and ga\ T e a new diagnosis of the genus. Later (1881, 12 b) 
Richiardi briefly described a second species, P. petersi, deeply 
implanted into the body of Gobius buccatus C. V., and a third one 
(1882, 18 c) P. bellottii , inserted into the branchial arterial stem 
of Scopelus benoiti. The latter species I think is identical with 
that figured on PI. II, Fig. 27, as this agrees in every essential point 
with the short description by Richiardi (as far as I know, the more 
complete description and the figure promised by R. (18 c, p. 150 
and 475) have never been published) x ). I found this parasite in 
numerous adult specimens on Scopelus glacialis and Se. rafinesquii. 
collected by the ‘“Thor” in the western part of the Mediterranean. 
in, and close to, the Straits of Gibraltar (on Station 99 of 96 speci¬ 
mens of Sc. glacialis 28 were infested, of 46 specimens of S. 
rafinesquii only 8; on Stat. 59 one specimen among 149 Sc. gla¬ 
cialis, and one among 5 Sc. rafinesquii carried the same; and on 
St. 61 (in the Strait itself) one of 2 S. rafinesquii) * 2 ). It is al- 
ways attached to the same spot of the host, namely under the 
isthmus, with the posterior end, bearing the egg-strings, pointing 
backwards and the ventral side looking towards the belly of the 
] ) Brian (3, p. 94) repeats Richiardi’s description, and only adds the 
following: “Due esemplari sporgenti fuori dell’ angolo boccale dello 
Scop. caudispinosus Johs. furono trovati in G-enova il 18 Maggio 1908". 
The figures, referred to, are PI. VII, Fig. 2, and PI. XIX, Figs. 2—5; 
but Avhat is represented there has nothing at all to do with any 
Peroderma whatsoever! 
2 ) “Tkor”s St. No. Lat. N. Long. W. Depth of capture Date 
99. 36° 02' 5° 16' 150 Met. 23 Ig 1910. 
59. 36° 12' 4° 21' 9—1200 — 21 / 2 1909. 
61. 35° 52' 5° 35' 300 — 21 G 1909. 
