Pleustes, Neopleustes 311 



uropods 1 — 3. Side-plates large, angular, Eyes veiy large, rounded, prominent, 

 jellowish or vermilion, with a black dot in ttie middle. Antennae 1 and 2 

 Short, slender, subequal. Gnathopods 1 and 2, 5*^ Joint slenderly produced, 

 6*^ large, ovtite, dentate below, finger about % length of 6*^ Joint. Peraeo- 

 pods 1 — 5 slender, peraeopods 3 — 5, 2'^ Joint but slightly expauded. Uropods 2 

 and 3, outer ramus shorter than inner. Telson subquadrate. Colour very 

 variable, generally dark reddish or brown, variegated and mottled with 

 white, sometimes a uniform deep purple or pure white. When disturbed, 

 rolls itself up, as if feigning death. L. 12-5 mm. 



Fundy Bay (Grand Manan). Depth 18 m. 



P. medius (tioes) 1866 Paramphithoe media, Goes in: Öfv. Ak. Förh., v.22 

 p. 523 t. 38 f. 13 I 1871 P. m., A. Boeck in: Forh. Selsk. Christian., 1870 p. 176 | 1876 

 Bleustes medius, A. Boeck, Skand. Arkt. Amphip., v. 2 p. 302 | 1893 Acanthozone 

 pulcheUa (part.)?, A. DellaValle in: F. Fl. Neapel, ?;. 20 p. 605. 



L. about 8 mm. 



Arctic Ocean (Spitzbergen). Depth 38 ui. 



P. OCCidentalis (Stimps.) 1864 Amphithonotus o., Stimpson in: P. Ae. 

 Philad., p. 158. 



Closely allied to P. panoplus and P. cataphractus. L. 19 mm. 



North-Pacific (North-America). 



P. tuberculatus Bäte 1858 P. tuherculata, Bäte in: Ann. nat. Hist., ser. 3 v.\ 

 p.362 I 1893 P. tuberculatus, G. 0. Sars, Crnst. Norway, vA p. 344 | 1871 Paramphithoe 

 panopla (err., noii Amphithoe p. Kröyer 1838!), A. Boeck in: Forh. Selsk. Christian., 

 1870 p.l76 I 1876 Pleustes panoplus, A. Boeck, Skand. Arkt. Amphip., v.2 p.303 | ?1894 

 P. panopla, T. Stebbing in: Bijdr. Dierk., ul7 p. 28 | 1893 Acanthozone p. (part.), A. Della 

 Valle in: F. Fl. Neapel, «.20 p. 607 | ?1858 Amphithoe panoploides, M. Sars in: Forh. 

 Selsk. Christian., p. 138. 



Perhaps only an aged form of P. cataphractus. L. 21 mm. 



Arctic Ocean. 



2. Gen. Neopleustes Stebb.*) 



1859 Paramphithoe (part.), R. M. Bruzelius in: Svenska Ak. Handl., n. ser. r. 3 

 nr. 1 p. 68 | 1866 Paramphithoe {p&rt), Goes in: Öfv. Ak. Förh., ».22 p. 523 | 1893 

 P., G. 0. Sars, Crust. Norway, v. 1 p. 346 | 1861 Amphithopsis (part.) -\- P. (part.), 

 A. Boeck in: Forh. Skand. Naturf., Made 8 p. 661, 662. 



Body slender, not indurated. Head more or less produced over antenna 1, 

 post-antennal corners usually projecting acutely. Side-plates not power- 

 fully developed. Antenna 1 usually long and mucli longer than antenna 2. 

 Upper lip unsymmetrically bilobed, incision oblique. Mandible, molar weak, 

 palp very large. Maxillae 1 and 2 nearly as in Pleustes. Maxillipeds 

 dififering by Joint 3 of palp distally attenuated, 4**^ spiniform. Gnathopods 1 

 and 2 feeble to moderately strong. Peraeopods more or less elongated. 

 Telson hollowed above, carinate below. 



7 species. 



*) Gen. nov. v^oc;, new, and Pleustes. Type is Amphitoe pulchella Kroyer (1846). 



