Day DR. T. SCOTT ON COPEPODA 
a piece of wood dredged from about 87 fathoms in the Faroe 
Channel; the wood was perforated to a considerable extent by 
the boring mollusk, Xylophaga dorsalis, Turton. Seven species 
of Copepoda, each representing a separate genus,and all belonging 
to the Harpacticide, were obtained in this piece of wood ; three 
of the species appear to be undescribed, but the others are all 
more or less widely distributed. 
The drawings which illustrate these notes were made a few 
years ago by my son, Mr. Andrew Scott, but shortly afterwards 
were mislaid and have only recently been recovered. 
COPEPODA. 
HaARpacricips. — 
ZosimE, Boeck, 1872 *. 
ZosimE TYPICA, Boeck. 
This species, which is somewhat ‘widely distributed, was 
represented by very few specimens. 
PsEvuDotacuipius, 7. Scott, 1898 +. 
The genus Pseudotachidius was instituted in 1898 for an 
interesting copepod discovered in the deep water at the mouth 
of Loch Fyne, and as there was but one species known at the 
time, the generic description was included in that of the species; 
but as another copepod has been found belonging apparently to 
the same generic type, it will be better now to give a separate 
definition of the genus. | 
Definition of the Genus Pseudotachidius, 7. Scott. 
Cephalothorax moderately broad, somewhat depressed ; abdo- 
men moderately narrow, more or less distinct from the cephalo- 
thorax. Antennules short, five- or six-jointed. Antenne with 
secondary branches well developed and composed of three joints. 
Mandibles nearly as in Tachidius, Lilljeborg, and with a mode- 
rately developed two-branched palp. Other mouth-organs also 
similar to those of Zachidius. Both branches of the first four 
pairs of thoracic feet three-jointed, inner branches of first pair 
* Mon. British Copepoda, Brady, vol. ii. p. 14 (1880). 
t 16th Ann. Rep. Fishery Board for Scotland, part iii. p. 267 (1898). 
