of the, Fishery Board for Scotland. 253 



1st. The anterior antennas are nine-jointed, four small joints precede 

 the last one in the Forth specimen (fig. 11) instead of three as described 

 for Tetragoniceps maleolata. 2d. The fifth pair of swimming feet are 

 two-branched (fig. 12) in the Forth specimen, but in T. maleolata they 

 are one-branched. This difference is a more important one than that 

 between the anterior antennas, 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 

 antennas, might have been ascribed to that genus, but the general contour 

 of the animal is that of Tetragoniceps, and decidedly different from either 

 Normanella or Qletodes. 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,^ n. sp. (PL X. fig. 19-28.) 



Length, '54 mm. (jVth of an inch). Body slender. Rostrum small. 

 Anterior antennas slender, niue-jointed in the male, eight-jointed in the 

 female, the proportional length of the joints as in the formula 



Male, . . . 15 • 16 - 11 ' 2 l 6 i 2'5 l 4 , 8 



1- 2- 3- 4 • 5 • 6 • 7 • 8 • 9 

 Female, . . 15 • 15 • 3 • 15 • 5 • 5 ■ 5 • 9 



The male antennas are hinged between the second and third and sixth and 

 seventh joints. Posterior antennas 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 bi-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 j three slender subequal 

 setas 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 setas. 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 fathoms water, bottom 

 clean sand. 



Tetragoniceps Brady i* n. sp. (PI. IX. fig. 19-32.) 



Length, exclusive of tail seta, 1 mm. (^th of an inch). In general form 

 like Tetragoniceps maleolata, but the first cephalo-thoracic segment is 

 scarcely so angular in front. Rostrum very short, anterior antennas 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. S. Brady, who instituted the 

 genus, aud to whoso untiring and disinterested kindness the author of these notes 

 owes much of his success in the study of the Entomostraca. 



iMaKpds, long, and 6vvS, claw, referring to the long claw of the posterior foot-jaw. 



