510 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxv, 



I ii i gnathopods with the hand narrowly oval with the palm 

 ;in<l po terioi margin forming an even regular curve. First and 



econd perteopod with the dactyls slightly longer than the two pre 

 ceding joini i combined. Third peraeopods with the l>;i ;d joint 

 broadly and evenly rounded in front with :i few plumose etas near 

 the middle of the anterior margin; i»" terior margin produced into 

 :i very prominenl rounded lobe; carpus with two pairs of short 



pine near the anterior margin and a cluster :>i the lower margin; 

 propodus with two ipines on posterior margin and with several setas 

 hut no pine in the anterior one. Fourth peraeopods with n tew 

 |)liini<> e etaj near the middle of the rounded and projecting anterior 

 margin ; carpus with five or i\ pines on anterior margin and u 

 • In in of everal at the distal end; propodus with two pine on 

 posterior margin and m row of eight or nine on the 'I i I ;i I two third 

 of the anterior margin. Basal join! <»l the la I peraeopods with the 



posterior expansion obliquely rounded off below; ilnrd | i about 



;i long as the fourth, exclusive of the po terior lobe; fourth joint 

 with ;i posterior lobe extending behind the following joini a far u 

 ii distal third or fourth and furni hed with about nine long plum" <■ 



etse on its po iterior and 'Ii ital margin ; fifth joint about as long :is 

 the ixth| dactyl markedly horter than the preceding joint. 



tnfero po terior angle of the third abdominal segment ;ilni<> I :i 

 light angle and but very slightly produced. Fourth egment with ;i 

 do] al depression anteriorly, followed by crest whose posterior end 

 i con iderably above the following segment. Third uropods with 

 father broadly lanceolate rami, which are devoid of marginal spinei 

 but are furni lied with etae on the <li tal portion of their opposed 

 margins and along the outer side of the outer ramu i. Telson twice 

 sis long :i broad, armed with two pairs of doi 'sal ipinules, and fur 

 ni hed with :• pinule and ;« eta ;ii the lip of each lobe. 



/.< in/1 h. I"' i 



Locality. A. single specimen from Station L415, off Santa Barbard 

 I hind, 302 638 fathoms, along with specimen of [canthoplcuHtv.s 



il n m < h lis. 



Type. Cat. No. 38545, ISAM 



Tin pecie fesemble L. odontoplax Sars, but ili< i bead is not 

 carinate dorsally ; the first pairs of side plates are devoid of n tooth 

 at the micro posterior angle, the band of the lirsi gnathopods lias 

 the po tei ior margin more evenly curved, and the posterior expansion 

 of the last peraeopods is oblique instead of transversely truncated 

 below. From I. californica il is readily distinguished by its absence 

 of eyes, by the smaller posterior lobe of the merus of the posterior 

 peraeopods, by the broader terminal uropods, and by ili«' extremity 

 of • he ill on. 



