253 
ot ps late. ‘Od. The fifth pair of swimming feet are 
-branched (fig. 12) in the Forth specimen, but in 7. maleoluta they 
are one-branched. This difference is a more important one than that 
between the anterior antennz, because the one-branched fifth feet form 
one of the principal characters that. distinguish Tetragoniceps from Nor- 
manella, Our specimen, even though possessing a three-jointed posterior 
antenne, might have been ascribed to that genus, but the general contour 
of the animal i is that of Tetragoniceps, and decidedly different from either 
Normanella or Oletodes, It is worth noting also that the general outline 
of the fifth foot of our specimen—leaving out of account its two-jointed 
-structure—has a close resemblance to the fifth foot of Tetragoniceps. 
Tetragoniceps macronyx,t n. sp. (PI. X. fig. 19-28.) 
Length, ‘54 mm. (7th of an inch). Body slender. Rostrum small. 
Anterior antenne slender, nine-jointed in the male, eight-jointed in the 
female, the proportional length of the joints as in the formula. 
Male .  . .. 15'16'11* 2°6°2'5+4:8 
Pee oe * Pa ee ee e 
Female, F ERAS OT > re pg 
The male antennze are hinged between the second and third and sixth and 
seventh joints. Posterior antennz are of moderate length and three- 
Jointed ; secondary branch very rudimentary (fig. 22). Mandible palp 
small, one- or (?) two-branched. Anterior foot-jaw small, furnished with 
two marginal br-lobed setiferous processes, and bearing at the apex a long, 
slender, filamentous hair and a claw-like spine. Posterior foot-jaw 
elongate, armed with a long, slender, sinuous, terminal clawed spine, which 
has a long delicate seta springing from its base. The outer branches of 
the first four pairs of swimming feet three-jointed—that of the first pair 
being shorter than those of the other three pairs; three slender subequal 
sete spring from the end of the second joint of the outer branch of the 
fourth pair; the inner branch of the first pair are elongate, two-jointed ; 
first joint nearly as long as the outer branch, and bearing a single delicate 
seta near the middle of the outer margin; second joint fully half the 
length of the first, and furnished with two elongate terminal hairs. The 
inner branches of the following three pairs are short, two-jointed, 
and armed with a moderately long, stout terminal spine. Feet of fifth 
pair foliaceous, elongate, narrow-triangular. Caudal stylets rather 
longer than the last abdominal segment, and furnished with a moderately 
long and a few small sete. Ovisac single, and containing a few large 
ova. 
| Habitat: —Off St Monans, Firth of Forth. A few specimens only were 
obtained among dredged material from about 14 been water, bottom 
clean sand. 
Tetragoniceps Bradyi,* n. sp. (Pl. IX. fig. 19-32.) 
Length, exclusive of tail seta, 1 mm. (sth ofan inch). In general form 
like Tetragoniceps maleolata, but the first cephalo-thoracic segment is 
scarcely so angular in front. Rostrum very short, anterior antenne about 
as long as the first cephalo-thoracic segment, nine-jointed, the second 
joint produced into a strong claw on the under side (fig. 20); the propor- 
tional length of the joints are nearly as in the annexed formula 
* The name is given in compliment to Professor G. 8. Brady, who instituted the 
genus, and to whose untiring and disinterested kindness the author of these notes 
owes much of his success in the study of the Entomostraca. 
bone ae and dyvé, claw, referring to the long claw of the posterior foot-jaw. 
