210 Laphystiopsis, Acanthonotozomatidae, Odius 



by a deep depression. Head depressed, rostrum liorizoutal, lamellar, broadly 

 truncate, at its base forming lateral ridges on head. Side-plates 1 — 4 small, 

 not contigiious, simple, 5*^ aud 6*^ bilobed, 5*^ larger than aiiy. Pleon segmeut 3 

 less deep than 2"^, narrower below, postero-lateral eorners rounded. P^yes 

 represented by 2 irregulär patches of reddish pigment, coated with chalky wliite. 

 Antemia 1, 1^* Joint distally widened, rather longer than 2*\ 3*^ short, flagellum 

 more than thrice as long as peduncle, with 24 joints, 1^* longest, with 4 sensory 

 fascicles. Antenna 2 much shorter, ultimate aud penultiraate joints of peduncle 

 subequal, flagellum twice as long as peduncle, Gnathopods 1 and 2, 5*'i Joint 

 about as long as and rather wider than simply cylindric slightly cnrved G*'\ 

 finger small, streng, hooked, Peraeopods 1 and 2 with 2'^ Joint broad, aud 

 4*^ a little widened, otherwise very like the much smaller gnathopods 1 and 2. 

 Peraeopods 3 — 5 successively louger. Uropods 1 and 2, outer ramus much 

 the shorter, uropod 3, rami spinulose, acute, outer little shorter than inner. 

 Telson nearly semicircular. Oolour whitish. L. o 8 mm. 



Christianiafjord, Trondhjemsfjord, Arctic Ocean (Selsövig [Nordlandj). Depth 

 188—752 m. 



16. Farn. Acanthonotozomatidae 



1871 Subfam. Tphimedimie, A. Boeck in: Forh. Selsk. Christian., 1870 p. 178 

 1888 Iphiniedidae, T. Stebbing in: Rep.Voy. Challenger, v. 29 p. 882 | 1893 L, (4. (). 

 Sars, Crust. Xorway, v.l p. 372 | 1893 Dexaminidi, A. DellaValle in: F. Fl. Neapel, 

 V. 20 p. 556. 



Integument more or less indurated, processiferous. Head rostrate. 

 Side-plates well developed, 1^* — 4*^ usually acuminate. Eyes well developed. 

 Antennae 1 and 2 seldom elongate or very diflferent in length, accessory flagellum 

 absent or rudimentary. Mouth-parts projecting downward, and drawn out as 

 if for Piercing rather than biting. Guathopod 1 very slender aud feeble, 

 simple or chelate; guathopod 2 seldom strong. Peraeopods 3 — 5, 2*^ Joint 

 expanded, usually acute- at one or more points of bind margin. üropod 3, 

 rami lanceolate. Telson unarmed, apically emargiuate. 



Marine. 



4 genera, 11 accepted species and 3 doubtful. 



Synopsis of genera: 



/ Maxilla 1, palp 1-jointed 1. Gen. Odius p. 210 



\ Maxilla 1, palp 2-jointed — 2. 



1/ Maxilla 1, palp not reacliing apex of outer 

 ^ J plate 2. Gen. Panoploea p. 211 

 Maxilla 1, palp reaching beyond apex of 

 outer plate — 3. 



J Gnathopod 1 minutely chelate 3. Gen. Iphimedia p. 214 



\ Gnathopod 1 simple, wholly unchelate . 4. Gen. Acanthonotozoma . p. 218 



1. Gen. Odins Lillj. 



1862 Otus (Sp. un.: 0. carinatus) (non Jac. Hübner 1816, Lepidoptera!), Bäte, 

 Cat. Ampliip. Brit. Mus., p. 125 | 1865 Odius (nom. nov.), W. Lilljeborg in: N. Acta 

 Soc. Üpsal, ser. 3 v. 6 nr. 1 p. 18 (tabella), 19 | 1893 0., G. O. Sars, Crust. Norway, v. 1 

 p.380 i 1893 0., A. DellaValle in: F. Fl. Neapel, «;.20 p. 581. 



