36 On Crustacea from Scottish Waters. 



a half times the length of the joint to which they are articu- 

 lated (figs. 10-13). 



Fifth pair of thoracic feet short, moderately stout, and 

 slightly asymmetrical (fig. 14). The inner distal angle of 

 the penultimate joint becomes in the one ramus a small 

 papilliform process, but not in the other. The end joints of 

 both rami are furnished with a small spine near the middle of 

 the outer margin and with three unequal terminal spines, 

 the two inner spines being large and stout, and the outer as 

 shown in the drawing. 



Hah. Station 53 (lat. 59° 36' N., long. 7° 00' W.), 1140 

 metres, Aug. 17th, 1907. No males observed. 



Remarks. — This species, like Pseudotharybis zetlandicus, 

 T. Scott, has a moderately close resemblance to Tharybis, 

 G. O. Sars ; but the structure of the fifth pair of thoracic 

 feet in the female differs considerably and the first maxillipeds 

 are also devoid of sensory filaments. The species now 

 described also differs from P. zetlandicus in several respects, 

 i. e. in the asymmetrical antennules, in the armature of the 

 second maxillipeds and of the first and fifth pairs of thoracic 

 feet. One or two other though perhaps less prominent 

 differences might be mentioned, but those referred to are 

 sufficient to distinguish the present species from that pre- 

 viously described. 



EXPLANATION OF THE PLATES *. 



Plate II. 



Eusirogenes propinquus, sp. n. 



Fig. 1. Mandible and palp. 2. Second maxilla. 3. Maxillipeds. 4. First 



gnathopod. 5. Second gnathopod. 6 & 7. First and second 



pereiopods. 8. Last epimeral plate. 9. Telson. 



Porascinus fowleri, Stebbing. 

 Fig. 10. Upper antenna. 11. First maxilla. 12. Second maxilla, 

 13. First gnatbopod. 14. Second gnathopod. 15. First 

 pereiopod. 16. Tbird pereiopod. 



Plate III. 

 Pseudotharybis dubius. 

 Fig. 1. Female, side view. 2. (?) Right antennule. 3. (?) Left an- 

 tennule. 4. Antenna. 5 & 6. Mandible and palp. 7. Max- 

 illa. 8. First maxilliped. 9. Second maxilliped. 10. One of 

 first pair of swimming-feet. 11. One of second pair. 12. One 

 of third pair. 13. One of fourth pair. 14. Fifth pair. 15. Ab- 

 domen. 



Parascina fowleri, Stebbing. 

 Fig. 16. Maxillipeds. 17. Last pair of uropods and telson. 



* The figures are drawn with a " Zeiss " camera and are all enlarged. 



