249 Part III. — Seventeenth Annual Report 



parts of the Clyde and Loch Fyne. Euchaita appears to be even more 

 restricted in its distribution than Bradyidius. According to Sars (" JN r orw. 

 North Sea Exped.," Crust., Part I., p. 284), this species was at first 

 ascribed by Boeck to Euchseta prestandreai, Philippi, but was afterwards 

 described by him under the name which it now bears. 



Scolecithrix hibernica, A. Scott. 



1896. Scolecithrix hibernica, A. Scott, Ann. and Mag. Nat. 

 Hist., (6) vol. xviii., p. 362, PI. XVII. and XVIII. 



This species, though only recently discovered, is at times not very rare 

 in the Clyde and Loch Fyne tow-net gatherings. The following records 

 of its occurrence will indicate sufficiently the wide distribution of the 

 species in the Clyde district. During August last year it was obtained 

 at Stations ]1L and IV. (in Kilbrennan Sound), and at Stations XIII., 

 XIV., XV., and XVII. (Upper Loch Fyne), and in September at 

 Stations VII. and VIII. (4 or 5 miles south of Ailsa Craig). 



I have now to record its occurrence for the first time in the Moray 

 Firth, having obtained it in a tow-net gathering collected in June last 

 year at Station XVI. (vicinity of Smith Bank) from a depth of about 

 forty fathoms, but it was apparently rare in this gathering. The opinion 

 expressed by the describer of the species that Scolecithrix hibernica was 

 really a deep-water form, and that its being so would partly account for 

 its having been so long overlooked, is more or less confirmed by what is 

 observed regarding its distribution in the Clyde and in the Moray Firth. 



Scolecithrix pygmsea, sp. n. (PI. X., figs. 1--9). 



Description of the Female. — Somewhat like Scolecithrix hibernica, A. 

 Scott, in general appearance but smaller, the length of the specimen 

 figured is, exclusive of tail setae, '95 mm. (about 2 V of an inch). The 

 rostrum is small. The last segment of the thorax is produced on each 

 side into a hook^like process (fig. 1). The antennules are scarcely as long 

 as the thorax; they are twenty-four jointed ; the first two joints are 

 moderately large ; the third to the seventh are smaller ; but the eighth is 

 about twice as long as the preceding joint, and sub-equal in length to the 

 first and second. The joints that immediately follow the eighth are 

 shorter, but the others gradually increase in length, so that several of the 

 last joints are about as long as the eighth. The end joint is very small. 

 The antennules are only sparingly setiferous, but the terminal joints are 

 furnished with a few plumose hairs as shown by the figure. The formula 

 gives approximately the proportional lengths of all the joints, as 

 follows : — 



Numbers of the j oints, 1 -2 -3-4-5-67 "8 -9-10-11-12-13-1 4-1 5-16-17-18-19-20-21-22-23-24 

 Lengths of the joints, 12\L5-8-5-6-6-6\L2-8 7 -8 -9 -9 -9 -9 ■11»11'11'U'11'10'14'U "f 



The antennae, mandibles, and maxillae are all somewhat similar to those 

 of Scolecithrix hibernica. The anterior foot-jaws are furnished with 

 several lobes on the inner aspect as in Scolecithrix dubia, Giesbrecht. 

 The distal lobe is armed with a long slender spine, but the others are 

 setiferous. The special joint of each of the anterior foot-jaws carries a 

 number of the long slender worm-like hairs which form one of the 

 principal characters of the genus (fig. 3). The posterior foot-jaws are 

 elongate, and somewhat like those of Scolecithrix hibernica (fig. 4). 

 The first four pairs of swimming feet are also somewhat similar to those 

 of Scolecithrix hibernica, except that the marginal spines of the outer 



