834 



MR. n. G. JACKSON ON TliE 



history to tliese specimens, but one may surmise tliat they are 

 cave varieties of L. (jracile. 



Budde-Lund (1885) described from Sitka Ishind a species, 

 L. te)iue, but the only important points in his description are the 

 detail of tlie uropods and the size. These agree closely enough 

 with L. gracile to justify a provisional inclusion of the species in 

 the synonymy of L. gracile, but I have seen no specimens. 



Figiires in Richardson (1905). 



Varieti/. — L, (jr-acile var. Jlavitm, n. var. Pigment entirely 

 absent. Eyes I'ather small, round, and not reaching to lateral 

 maigin of head. 



4. LiUlDIUM LATUM, Sp. U. ('t'oxt-ligS. 7 & 8.) 



Length: d" (> min,, 2 ^'^^ i'>"»- Jlreadlh: J -J iinn., 9 4 mm. 



Sarface rough and covered with small scales. Head. Frontal 

 margin sinuate ; median Y very sharp and produced. Transverse 

 groove deep and passing behind eyes; frontal grooves very deep 

 a.nd curving back to join transverse groove abriiptl)^ Eyes large 

 and pear-shaped. Thorax. 1st somite without lateiul depressions 

 or bristle groups. Setaj at intervals on lateral border, but absent 

 on posterior border. Ooxal-plate sutures well marked on last 

 four somites in the female, only lightly marked on last two in 

 male; well drawn backwards on last three somites and slightly 

 on fourth somite. Antennal llagellum long, reaching back as 



Text- figure 7. 



I/igidium ledum, a, last four tlior.icic somites from left side ; b, Lead from above. 



far as hind margin of 4th somite; with 12 segments. Uropods. 

 Inner process of base shorter than base by about half its length, 

 stout and conical. (None of my specimens have undamaged 

 vu-opods.) The single seta arising from outer side of base, set 

 on sharp and pointed process. Telson deeply notched over 

 uropods ; blunt, rounded postero-latei'al atigles. 



Pleopods of (S . 1st exopod with one (?) bristle ; 1st endopod 

 with moderate process and one (?) bristle ; 2nd endopod ending 

 in pointed process. 



Colour. Brown and yellow mottled ; slightly lighter streak 

 down middle of back. (Joxal plates light and shai'ply defined 



