FAXON : NOTES ON THE CRUSTACEA. 157 



the shell is less coai-sely granulated, but more spiny in the former species than 

 in the latter ; the two lines on the proximal half of the rostrum in both species, 

 widely diverging as they pass backward over the gastric area, are marked by 

 small tubercles in N. aculeata, by distinct acute spines in X. agassizii ; the 

 top of the small median tubercle on the gastric area is truncated in J\'. acu- 

 leata, while in N. agassizii it is bluntly triangular, passing into a slight 

 median longitudinal carina both in front and behind ; the abdominal pleurae 

 are produced into longer spines in jN'. agassizii than in X. aculeata, and the 

 spines moreover trend more distinctly backward, iorming a stronger angle with 

 the vertical axis of the pleura ; the outer surfaces of these pleurae are quite 

 smooth in X. agassizii, while in X. aculeata they are conspicuously granulated 

 both on their margins and on the distinctly raised central field ; the lateral 

 borders of the abdominal terga, which form a festoon on each side of the ab- 

 domen, are more strongly convex in the former species ; another distinction is 

 apparent in the sixth abdominal somite, viz. in X. aculeata the antero-lateral 

 margin of the pleura is shorter than the postero-Iateral border, whereas in the 

 other species the antero-lateral border is longer than the postero-Iateral ; the 

 terguin of this somite in X. aculeata sends oif a granulated ridge from near its 

 posterior lateral angles, — a ridge which runs forward into the upper, depressed 

 portion of the pleura ; this ridge is not found in A", agassizii. 



Xephropsis rosea Bate is without much doubt a young individual of X. acu- 

 leata. X. atlantica Norman^ is very similar to X. agassizii, but has a sharp 

 spine on the anterior margin of the second abdominal pleura. 



Stenopus hispidus (Oliv.). 



Station 11. 37 fathoms. 1 specimen. 



12. 36 " 1 



36. 84 " 1 



" 132. 115 " 2 " 



Pontophilus gracilis Smith. 



Station 43. 339 fathoms. 1 specimen. 



47. 321 " 24 " 



" 48. 533 a 1 II 



" 221. 423 " 1 " 



Prionocrangon pectinata, sp. nov. 



Plate II. Figs. 4-7. 



Rostrum spiniform, inclined at an angle of 45° to the axis of the body. 

 Median dorsal line of the carapace armed with a row of eight spiniform teeth, 



^ Proc R07. Soc. Edinburgli for 1881-82, p. 684; Wood-Mason and Alcock, 

 Ann. Mag. Nat. Hist., Gth Series. Vol. VII. p. 197, Fig. 4, 1891. 



