efore the invention of the binomial
system, and subsequently, in 1778, by Da Costa, and again, in
1789, by Brugiere, there can be no question that Lepas must be
applied to the pedunculated section of the genus. In this
instance it is particularly desirable to recur to the Linnean
name, as no other name has been _generally_ adopted. Had not
Lister and Sir J. Hill published before the binomial system,
their names of Anatifera and Pentalasmis would have had prior
claims to Lepas.

[23] The date of this publication is almost universally given as
1792, apparently caused by an error in the title-page of the
First Part, which has consequently been cancelled. The First Part
contains Anatifa and Balanus, and was published in 1789. The
Second Part was published in 1792, and has a corrected title-page
for the whole _volume_.

_Valvae 5, approximatae: carina sursum inter terga extensa, deorsum aut
furca infossa aut disco externo terminata: scuta subtriangula, umbonibus
ad angulum rostralem positis._

Valves 5, approximate: carina extending up between the terga,
terminating downwards in an embedded fork, or in an external disc: scuta
sub-triangular, with their umbones at the rostral angle.

Filaments seated beneath the basal articulation of the first cirri;
mandibles with five teeth; maxillae step-formed; caudal appendages
uniarticulate, smooth.

_Distribution._--Mundane; attached to floating objects.

_Description._--Capitulum flattened, sub-triangular, composed of five
approximate valves. The valves are either moderately thick and
translucent, or very thin and transparent; and hence, though themselves
colourless, they are often coloured by the underlying corium. Their
surfaces are either smooth and polished, or striated, or furrowed, and
sometimes pectinated. They are not subject to disintegration; they are
generally naked, except on the borders, where they are coated, and held
together by membrane; in _L. fascicularis_, however, the valves are
covered with thin membrane, bearing very minute spines. The manner of
growth of the valves will be best described under each. All the valves,
even in the same species, are subject to considerable variation in
shape, more especially the terga.

_Scuta._--These valves are sub-triangular in outline, with the basal
margin straight and rather short; and with occludent and tergo-carinal
margins more or less protuberant; in _L. fascicularis_,