260 Part I11-—Twelfth Annual Report 
Pseudanthessius sauvaget, Canu. 
1891. Pseudanthessius sauvage, Canu (10 0.), p. 481. 
1892. Pseudanthessius sauvaget, Canu (11), p. 243, pl. xxv. 
figs. 1-17. 
1894. Pseudanthessius sauvage, T. and A. Scott (31), p. 146. 
Habitat.—Off St Monans. Rare. 
Want of time has prevented the preparation of drawings of this 
interesting species for the present paper. 
Pseudanthessius gracilis, Claus. 
1889. Pseudanthessius gracilis, Claus (13), vol. viii. p. 344, pl. iv. 
figs. 1--7. 
1893. Pseudanthessius gracilis, T. and A. Scott (32), p. 241, pl. 
xii. figs. 15--20. 
Halitat.—Off Musselburgh, among material collected in 1891. Some 
specimens were also taken in the Moray Firth among Filograna implexa. 
One of the Moray Firth specimens measured 1°3 mm. (,'jth of an inch). 
The anterior antennze are shorter than the first body segment, and seven- 
jointed ; the third and the last joints are the shortest. The proportional 
lengths are shown by the formula:— 
A A208 7 AA AiG ona 
LO Orie: GesOe ne Oieaen ae 
The third joint of the posterior antenne is very small. The anterior 
foot-jaws are slender, and armed with a few strong teeth on the upper 
edge. A plumose seta springs from the inner edge near the base of 
the second joint. Posterior foot-jaws three-jointed. Second joint some- 
what dilated, and bearing a short stout spine. The last joint very 
small, and armed with two terminal spines. Inner branches of the 
fourth pair of thoracic feet one-jointed, scarcely reaching to the end of 
the second joint of the outer branches, and armed with two dagger-shaped 
spines at the truncate apex. There is a small hook-like process near the 
middle of the inner margin. Fifth pair small, sub-quadrate, and furnished 
at the apex with an elongate dagger-like spine and a plain seta. Caudal 
stylets equal to about twice the length of the last abdominal segment. A 
small seta springs from near the middle of the outer margin of each 
stylet in addition to the terminal setz. 
This species differs from Pseudanthessius thorellii (B. and R.), with 
which it is closely allied, in the form of the anterior foot-jaws in the 
proportional length of the inner branches of the fourth pair of thoracic 
feet, and in the form of the abdomen. 
Family AscoMYZONTID, 
Genus Dermatomyzon, Claus (1889). 
[Cyclopicera, Brady (in part) ]. 
Dermatomyzon gibberum, T. and A. Scott. (Pl. X. figs. 26-34.) 
1894. Dermatomyzon gibberum, T. and A. Scott, p. 144, pl. ix. 
figs. 10-14. 
Description.—Female. Length, 5mm. (, ofaninch). Cephalo-thorax 
broadly ovate, or pear-shaped. Abdomen very short ; its length, including 
that of the stylets, is scarcely equal to one-fourth of the length of cephalo- 
thorax. Anterior antenne stout, seventeen-jointed. The second basal joint 
