202 Pereionotus, Palinnotus 



Peraeon segmeiits 1 — 7, pleon segmeuts 1 and 2 tuberculately cariuate 

 and setulose, lateral tubercles on peraeon segments 2 — 7. Pleon segment 5 

 apparently missing in 9, short in ö. Head flat, wideuing distally, a small 

 point projecting beiow the eye. Side-plates l — 4 wide, outspread, fringed, 

 4*'' a little emarginate. Eyes si>t)globose, red (Montagu: black). Antenua 1, 

 1"** Joint very broad, with short obtuse apical process, 2^ shorter and 

 naiTOwer with small process, 3^ scarcely shorter, this and the little 1-joiuted 

 flagellum carrying long setae. Antenna 2 inserted some way behind antenna 1, 

 much shorter, only 3 free joints of peduucle, nltimate and penultimate joints 

 subequal, flagellum 2- or 3-jointed, shorter than antepenultimate Joint ot" 

 peduncle. tipped with long setae. Gnathopods 1 and 2, 3^ Joint longer than 

 broad, 4^'' triangulär, underriding short 5^'', G*^ simple as in peraeopods, tipped 

 with spine. Peraeopods 1 and 2, 2*^ Joint rather stout, not long, 4*^ and 

 5^'' short, and broad in comparison with the length, 6*'^ Joint and finger 

 similar in all the limbs. Colour dull red, with a white spot on the anterior 

 part of the back, but as the iusect dies this mark is lost (Montagu); uniforni 

 yellow brown on segments of peraeon and pleon, with large white spots on 

 2*^ peraeon segment (Della Valle). L. 3 — 4 mm. 



English Channel (Sontli of Great Britain). Moditcrraneiin. 



3. Gen. Palinnotus Stebb. 



1900 Palinnotus (Sp. typ.: F. thomsoni), T. Stebbing in: Ann. uat. ili.st.. ser. 7 

 V. 5 p. 16. 



0. In general agreement witli Pereionotus, but distinguished as 

 follows. Upper lip not bilobed. Maxiila 1 with a small spinule representing 

 the palp. Maxillipeds, outer plates reaching slightly beyond the 3-jointed 

 palp, and minutely fringed on distal half of inner margin. Pleopod 3, but 

 not pleopod 2, with inner side of peduncle produced. Uropod 2 developed, 

 short, uniranious. Uropod 3 without distinction of peduncle and ramus. — 

 ö uuknowu. 



1 species. 



1. P. thomsoni (Stebb.) 1899 Pereionotus t., T. Stebbing in: Tr. Linn. Soc. 

 London, ser. 2 v.7 p. 417 t. SSa! 1900 Palinnotus t., T. Stebbing in: Ann. nat. Hist., 

 ser. 7 v. 5 p. 16. 



Body broad oval. Peraeon segments 1—7 and pleon segments 1 and 2 

 carinate, the medio-dorsal processes not quite as long as their segments, 

 that on peraeon segment 1 preceded by au acute point directed forward. 

 Head, rostrum small, but distinct. lateral angles a little in advance. Side- 

 plates 1 — 4 without conspicuous setules on distal margin. Eyes rounded 

 oval, dark, on lateral lobes of head. Antenna 1, 1^* Joint broad, 2"^ cylindrical, 

 3*^ conical, flagellum small, 2-jointed. Antenna 2 shorter, much more 

 slender, attached to the rear of antenna 1 on under surface of head, ultimatc 

 Joint of peduncle rather longer than penultimate, flagellum with long setae, 

 1- or 2-jointed. Gnathopods 1 and 2 and peraeopods 1 and 2 as in Iphiplateia 

 wbiteleggei (p. 203). All the limbs have a rather stroiig spine at apex and at 

 middle of inner margin of 6*^ Joint. Peraeopod 3, 2*^ Joint broader than 

 long, 4*^ not longer tban 3'^, very broadly lobed. Peraeopods 4 and 5 with 

 2*^ and 4*^ joints successively much smaller than in peraeopod 3, 2'^ in 

 peraeopod 5 with bind lobe not reaching instead of overlapping the 3*^ Joint. 

 Pleopod 2, peduncle broader than long, inner margin couvex, but not 



