Mysida3//*om the West Coast of Ireland. 11.") 



the last species ; visuril elements imperfectly developed, 

 numerous ; pii,nneut pale piu"|)lisli pink. 



AntcttiniUir peduncle in tlie female extending slightly more 

 than halfway up the scale, third joint rat'ier shorter and 

 not wider than the first ; in the male relatively a little 

 longer, with the third joint slightly longer and more robust 

 than in the feuiale; male process well developed and hirsute. 



A/i/en/ial peduncle onlv slightly shorter than the an- 

 tcnnular; thiid joint the longest and most robust. 



Antennal scale extending for rather less than half its 

 length beyond the antennular peduncle; about three times 

 as long as broad ; outer margin slightly sinuate and ter- 

 minating in a very strong spine which projects for its entire 

 length beyond the apcK of the scale ; outer distal corner of 

 the basal joint j)rolonge(l into a long acute spine. 



Telson about three quarters of the length of the last 

 segment of the pleon and slightly less than twice as long as 

 broad at its base ; entire and lanciform in shape, tapering 

 distally to a narrowly rounded apex; the distal two thirds of 

 its margin armed with about eighteen long slender spines, 

 incroa-iug in length towards the apex ; the terminal spines 

 about one seventh of the total length of the telson ; a single 

 very slender median spine at the apex between the terminal 

 spines of the margins ; median setie absent. 



Uropods slender : inner, only a little longer than the telson 

 plus the terminal spines and with fcmr long spines on its 

 ventral inner margin in the region of the otocyst; outer, 

 about one and a half times as long as the telson. 



Length of an adult and mature male and female, 10 mm. 



The third, to the eighth thoracic limbs are broken off in 

 both si)eeimens. The first and second thoracic limbs and 

 the mouth-parts, as well as tlie male pleopods. aie in sul)- 

 stantial a^ireement with the same parts in both the type and 

 the foregoing species, except that the last joint of the 

 mandibular palp is shorter and somewhat more robust. 



Locality. An adult male and female from S.R. 350, 

 5G miles W. by N. of Tearaght, Co. Kerry, 465-492 fath., 

 August 190G, tow-net on trawl. 



This species is at once distinguished from its congeners by 

 the characters of the eye, antennal scale, telson, and inner 

 uropods. The sixth ple(jn-segment is also relatively longer 

 than in either of the other two species. The antennal scale 

 resembles rather closely that figured for Parauibbjops ros- 

 iratu, II. &T., 1005. 



8* 



