320 Sympleustes, Pai-apleustes, Paramphithoidae 



Rather robust, smooth. Head, lateral corners obtuse. Side-plate 1 

 shallow, 2^ — 4*^ successively deeper, all 4 narrow distally, 5^^ witli bind lobe 

 much deeper than front. Pleon segment 3, postero-lateral corners obtusely 

 quadrate. Eyes large, subreniform. Anteuna 1, P* Joint longer than 2"^ 

 and 3^ combined. Antenna 2 little more than ^/g length of antenna 1. 

 Gnathopod 1 rather stout, 5*^ Joint a little shorter and distally wider than 

 6*^ 6*'^ oblong, palm very oblique but well detined, near middle deeply 

 and irregularly incised, incision armed with 2 spines. Gnathopod 2 rather 

 longer and stronger, 5*'^ Joint like that of gnathopod 1, but 6*^ as wide as 

 5*^ and much longer, palm rather oblique, defined by a tooth and palmar 

 spines, and having a wide and deep almost semicircular incision. Peraeo- 

 pods 3 — 5 subequal in length, 2*^ Joint oblong with rounded corners, 4*'i 

 long, not broad. Uropod 3, outer raraus '^l.^ as long as inner. L. about 

 8 mm (mouth-organs and telson not described). 



Arctic Ocean (Grreetiland). Depth 94 m. 



Gen. Parapleustes Buchh. 



1874 Parapleustes (Sp. un.: P. ylaeilis), Buchholz in: Zweite D. Nordpolarf., 

 r. 2 p. 337. 



1 species. 



P. gracilis Buchh. 1874 P. glacilis, P. gracilis, Buchholz in: Zweite D. Nord- 

 polarf., v. 2 p. 2H9. 337 Crust. t. 7 f . 1 | ? 1887 Paramphithoe gracilis, H. J. Hansen in: Vid. 

 Meddel., ser. 4 v. 9 p. 124 | 1893 AcanthozonejMlchella^p&rt.)?, A.bicuspis, A. DellaValle 

 in: F. Fl. Neapel, i;.20 j). 605, 942. 



In niany respects agreeing closely with Neopleustes brevicornis (p. 313). Mandible 

 with no molar tubercle, excluding the species from Gen. Sympleustes (p. 317). 

 L. 5 mm. 



Arctic ücean (Sabine Island). Depth 19 m. 



24. Farn. Paramphithoidae 



1871 Subfain. Epimerinae, A. Boeck in: Forh. Selsk. Christian., 1870 p. 183 | 

 1888 Epimeridae, T. Stebbing in: Kep. Voy. Challenger, u 29 p. 876 | 1893 E., G. 

 Sars, Crust. Norway, v. 1 p. 362. 



Integument indurated, processiferous (Fig. 74, p.327). Side-plates rigid, 

 some acute. Eyes, when present, prominent. Antenna l shorter than antenna 2, 

 flagellum in both many-jointed, accessoiy flagellum rudimentary or absent. 

 Upper lip not deeply or not incised. Lower lip, inner lobes coalescing with 

 outer or absent. Mandible, accessory plate on right as well as on left. 

 Maxillipeds, outer plates broad, not long, scantily armed on inner margin, 

 tinger small. Mouth-parts in. general strongly developed. Gnathopods 1 

 and 2 (Fig. 75, 76, p. 327) not stout in structure, 5^^ and 6^^ joints narrow, 

 finger small. Peraeopods 3 — 5, 2*^ Joint not widely expanded. Uropod 3, 

 rami lanceolate, longer than peduncle. Telson not large, entii-e or distally 

 insinuate. Sexual difference very slight. 



Marine. Free swimming, rarely semiparasitic. 

 3 genera, 8 accepted species and 1 obscure. 



