Entomostraca from the Scottish Seas. 126 



1898. Scolecithrix koehleri, Giesbrecht, Das Tierreich, 6 Lief. (Cope- 



poda) p. 46. 

 1905. Oothriv bidentata, Farran, Ann. Rep. Fish. Ireland, 1902-03, 



pt. ii. App. ii. (1905) p. 42, pi. x. figs. 15-18, pi. xi. figs. 1-10. 



This appears to be a true deep-water species ; it was 

 moderately common in two of the ' Goldseeker ' gatherings, 

 one from 1140, the other from 1100 metres, collected in lat. 

 59° 36' N., long. 7° W., and lat. 59° 25' N., long. 7° 33' W., 

 in August 1907. 



Having had the privilege of examining well-developed 

 specimens of both the male and female of this species, I am 

 convinced that Oothrix bidentata is identical with Neoscole- 

 cithrix kcehleri, and also that the species is not a true Scole- 

 cithrix, and that Canu's name should therefore be restored. 



Genus PSEUDOTHARYBIS, nov. 



Resembling Tharybis } G. O. Sars, in general appearance. 

 Female antennules composed of twenty-four joints. An- 

 tennae with ihe inner ramus considerably shorter than the 

 outer. Mandibles with the biting edge truncated and armed 

 with stout teeth. Maxillae somewhat expanded, masticatory 

 lobe broadly truncate and furnished with several setiferous 

 spines. First maxillipeds without sensory filaments, other- 

 wise nearly as in Tharybis. Second maxillipeds and 

 swimming-feet also nearly as in that genus. Last pair of 

 legs triarticulate, end joint with a spinitorm extremity, and 

 with two stout spines on the outer margin. 



Pseudotharybis zetlandicus, sp. n., ? . 

 (PI. II. figs. 8-13; PI. III. figs. 12-18.) 



Body robust; forehead broadly rounded; rostrum short, 

 bifurcated, furca short, broadly triangular, somewhat divari- 

 cated, and with a moderately wide space between them 

 (PI. II. fig. 9). The first cephalothoracic segment more 

 than half the length of the cephalothorax ; the lateral angles 

 of the last segment are produced into sharp tooth-like pro- 

 cesses, which are slightly divaricate. Abdomen short, with 

 short f ureal rami (PI. II. fig. 8). 



Length 3*8 mm. 



Antennules (PI. II. fig. 10) somewhat shorter than the 

 cephalothorax and composed of twenty-four joints, the 

 proportional lengths of which are nearly as in the formula : — 



Number of the joints 1 2 34567 8 9 10 11 



Proportional lengths of ditto . . 20 . 16 . 8 . 8 . 8 . 8 . 9 . 13 . 8 . 8 . 8 . 

 1 2 13 14 15 16 17 18 19 20 21 22 23 24 

 10 . 11 . 11 . 11 . 10 . 10 . 10 . 7 . 7 . 6 . 7 . 7 . 3 ' 



