u 2 DISCOVERY REPORTS 



separate, in the form of flat, rounded plates without visual elements or pigment, the anterior margin 

 produced, either on the outer angle only or on both anterior angles, into spine-like processes ; margins of 

 eyeplates may be spinulose. Labrum broader than long, produced anteriorly into a short, more or 

 less pointed, projection. A long spear-like outgrowth, arising from the anterior end of the head in the 

 vertical plane, extends forwards between the antennular peduncles almost to the distal end of the 

 third segment. In dorso-ventral view this outgrowth appears very slender, but in lateral view it is 

 quite broad proximally. Strong, curved, forwardly directed, spinulose sternal processes on the second 

 to the eighth thoracic sterna in males and immature females. Thoracic appendages and pleopods as in 

 Amblyops. Telson large, linguiform, with broad, truncate apex armed with 5-6 pairs of spines of 

 varying size, with or without median setae; lateral margins armed with 12-23 short strong spines. 

 Three species are now included in this genus, two from Irish waters and one from the Antarctic. 





Occurrence : 



Paramblyops brevirostris sp.n. 

 (Fig. 25A-F) 



St. 181. 12. iii. 27 (day). Schollaert Channel, Palmer Archipelago, 160-335 m -> 3 ??> 2 ovi g-> lar g est l6 mm - 



$ Types. 

 St. 182. 14. iii. 27 (day). Schollaert Channel, Palmer Archipelago, 278-500 m., 1 <J, imm., 13 mm., 1 ?, adult, 



15 mm. (J Type. 



Description. Carapace short, produced anteriorly into a blunt right-angled rostrum partially 

 covering the eyeplates but not extending forward as far as their distal margins; deeply emarginate 

 posteriorly, leaving the last three thoracic somites exposed in dorsal view; very shallow laterally 

 leaving the bases of the thoracic appendages exposed. I am unable to make out any spinules on the 

 margins of the rostrum (Fig. 25 A, B). Antennular peduncles short and not very robust; the hirsute 

 lobe of the male is large although the specimen is not mature and the pleopods not well developed 

 (Fig. 25 A, B). Antenna with the peduncle long and extending considerably beyond the antennular 

 peduncles; composed of three segments which do not overlap in any way; scale large and broad with 

 the apex less oblique than in the other two species of the genus; two strong spines at the distal outer 

 corner of the sympod, one on either side of the base of the outer margin of the scale (Fig. 25 A, B). 

 Eyeplates rather widely separated, anterior margins somewhat convex, minutely and sparsely spinu- 

 lose; antero-lateral angle produced into a strong pointed process (Fig. 25 A). Labrum broader than 

 long; anterior margin produced into a strong point (Fig. 25 C). 



Immediately anterior to the labrum, arising from the median line running over the anterior end of 

 the head, there is a very strong spear-shaped process, which projects forward between the antennules 

 extending almost to the distal end of the antennular peduncle. In dorso-ventral view, this process is 

 very slender, but if the antennules are moved aside it is seen to be wide at its base, tapering off to 

 a fine point distally. It was at first thought to be a prolongation of the anterior margin of the labrum 

 and was erroneously described as such in the original description of P. rostrata. 



On each of the second to the eighth thoracic sterna in the male specimen, there is borne in the 

 median line a very strong, forwardly curved, hispid, transparent process. These processes are not 

 present in any of the female specimens, which are all fully adult (Fig. 25 B). Endopods of the third to 

 the eighth thoracic appendages long and extremely slender; carpus nearly three times as long as the 

 two-segmented propodus and separated from it by a very oblique articulation; dactylus forming 

 a strong claw with the nail. The distal end of the endopod is densely covered with long non-plumose 

 setae (Fig. 25 D). Uropods only slightly longer than the telson. I can find no trace of the single spine 

 on the endopod, which has been recorded in both P. rostrata and P. bidigitata (Fig. 25 E). Telson 



