120 Eathyporeia 



Sj-nopsis of accepted species: 



/ Pleon segnient 3, postero-lateral angles produced 



j to a tooth 1. B. gmlliamsoniana . p. 120 



i Pleon Segment 3, postero-lateral angles not 

 ' produced to a tooth — 2. 



( Pleon Segment 4 with dorsal spinules — 3. 

 \ Pleon segment 4 without dorsal spinules — 4. 



J Pleon segment 4 with 1 pair of dorsal spinules 2. B. pelagica j». 120 



) Pleon segment 4 with 2 pairs of dorsal spinules 3. B. gracilis y>. 121 



{Peraeopods 4 and 5. 2<1 Joint less than half 

 as long as rest of limb 4. B. robertsoni .. . . . j). 121 

 Peraeopods 4 and 5, 2d Joint more than half 

 as long as rest of lirab 5. B. pilosa p. 121 



1. B. guilliamsoniana (Hate) 1856 Thersites guilliatusonia (nom. nud.). Eate 

 in: Kep. Brit. Ass., Meet. 25 p. 59 | 1857 T. guilliamsoniana, Bäte in: Ann. nat. Hist., 

 ser. 2 V. 19 p. 146 | 1857 Bathyporea guiUiamsonia, B. pilosa?, Bäte in: Ann. nat. Hist., 

 ser. 2 V. 19 p. 271 1 1862 Bathyporeia p. (err., non Lindström 1855!), Bäte. Cat. 

 Aniphip. Brit. Mus., p. 172 t. 31 f. 4 | 1891 B. norvegica, G. O. Sars, Crust. Xorway, c. 1 

 p. 128 t.43 I 1893 B. n., A. DellaValle in: F. Fl. Neapel, «.20 p. 754 | 1893 B. n., 

 T. Scott in: ßep. Fish. Board Scott., v. 11 p. 213 t. 5 f. 22. 



Back comparatively broad. Head scarcely as long as peraeou segmeiits 1 

 and 2 combined. Side-plate 1 acutely pointed, 2<* and 3^ with small tooth at 

 hinder angl^, Pleon segment 3 with postero-lateral angles forming a short 

 but distinct tooth; segment 4 dorsally depressed deeply at base, with a pair 

 of spinules behind the bent setules. Eyes in o reniform, in 6 much longer, 

 Avidening upward, dark red. Antenna 1 (Fig. 30), flagellum in Q with 8, in d with 

 13 joints, 2<^ Joint of accessory flagellum ^^ as long as the 1^*, which has spinules 

 on both edges. Antenna 2, flagellum in o with 8 joints, shorter than last 2 of 

 peduncle, in 6 slender, considerably longer than the body. Gnathopod 1, 

 6*ii Joint broadly oval, much shorter than 5*^. Peraeopod 3, 4*^ Joint much 

 expanded, setose, as long as 5*^ and 6*^ combined. Peraeopods 4 and 5, 2*^ Joint 

 about half as long as rest of limb. üropod 3, V'^ Joint of outer ramus a 

 little dilated distally, 2*^ about 7s as long, setose on both margins. Each 

 half of telson sublinear, with about 9 apical spines and 4 lateral. Body 

 pellucid, nearly colourless. L. 9 7, d 8 mm. 



North-Atlantie and Xorth-Sea (England, between tide-niarks; Scotland: Soutli- 

 }^orway, depth 4 — 11 m). 



2. B. pelagica (Bäte) 1856 Thersites p. (nom. nud.), Bäte in: ilep. Brit. Ass., 

 3icet. 25 p. 59 1857 T.p., Bäte in: Ann. nat. Hist., ser. 2 v. 19 p. 146 | 1862 Batliyporeinp., 

 Bäte, Cat. Amphip. Brit^ Mus., p. 174 t. 31 f. 6 j 1891 B. p., G. O. Sars, Crust. Xorway, 

 vA p. 129 t. 44 f. 1 I 1893 B. p., T. Scott in: Rep. Fish. Board Scotl., v. 11 p. 213 

 t. 5 f. 23 — 25 ! 1875 B. pilosa (part.), T. Stebbing in: Ann. nat. Hist., ser. 4 u 15 j). 74 

 t.3 i 1893 B.p. (part.), A. DellaValle in: F. Fl. Neapel, ».20 p. 752 | 1877 B. tennipes, 

 Meinert in: Naturh. Tidsskr., ser. 3 r. 11 p. 201. 



More slender than the preceding species; head fully as long as peraeon 

 Segments 1 and 2. Side-plate 1 less narrowed in front, obtusely pointed. in 

 2'^ and 3*^ tooth obsolete. Pleon segment 3, lateral angles rounded, without 

 tooth ; segment 4 with a like pair of spinules. Eyes in 9 small, rounded oval, 

 larger in cJ, bright red. Antenna 1, flagellum in 9 6-, in ä 9-joiuted; accessory 

 flagellum, 2*^ Joint nearly half as long as 1^*, which has spinules on outer 

 edge only. Antenna 2, flagellum in Q with 7 joints, much shorter than last 2 of 



