Haustoriidae, Bathyporeia 



119 



Synopsis of tlie geiiera: 



j Antenna 1 (Fig. 30) geniculate between Ist 



' and 2<i joints 



I Antenna 1 (Fig. 31, 32) not geniculate — 2. 



(Peraeopods 4 (Fig. 35) and 5 with 4tli and 5tli 

 joints greatly expanded — 3. 

 j Peraeopods 4 and 5 (Fig. 36) witli sonie or all 

 ' of those joints little expanded — 4. 

 ) Gnathopods 1 and 2 with 3<i Joint elongate 

 ) Gnathopods 1 and 2 with 3d Joint short 

 ) One of the side-plates abnormally small . . 

 I Xone of the side-plates abnormally small — 5. 

 / Side-plates 1 — 4 obtusely pointed below . . 

 \ Side-plates l — 4 broadly rounded below — 6. 

 I Guathopod 1, 5tli Joint short and broad . . 

 I Gnathopod 1. 5tli Joint long and narrow — 7. 



(Peraeopod 4, 4tli Joint not expanded; peraeo- 

 pod 5, 2d Joint not greatly produced 



downward 



Peraeopod 4, 4tli Joint much expanded; peraeo- 

 pod 5, 2d Joint greatly produced downward 



1. Gen. Bathyporeia . . p. 119 



2. Gen. Platyisehnopus . p. 122 



3. Gen. Haustorius . . . p. 124 



4. Gen. Cardenio ....[>. 125 



5. Gen. Priseillina ...]>. 12ß 



6. Gen. Pontoporeia . . . p. 127 



7. Gen. Urothoe p. 128 



8. Gen. Urothoides . . . p. 132 



1. Gen. Bathyporeia Lindstr. 



1855 Bathyporeia (Sp. un. : B. pilosä). Lindström in: Öfv. Ak. Förh.; r. 12 p. 59 I 

 1857 Bathyporea (laps.), Bäte in: Ann. nat. Hist., ser. 2 ».19 p. 271 | 1891 Bathyporeia, 

 G. 0. Sars, Crust. Xorway, i: 1 p. 127 | 1893 B., A. DellaValle in:' F. Fl. Neapel, n 20 

 p. 751 j 1856 Thersites (nom. nud.), Bäte in: Rep. Brit. Ass., Meet. 25 p. 59 | 1857 T. 

 (non L.Pfeiffer 1855, Mollusca!), Bäte in: Ann. nat. Hist., ser. 2 v. 19 j). 146. 



Body corapressed. Head without rostrum. Side-plates not very large, 1*^^ 

 uaiTow, bent forward. Pleon segment 4 with 2 dorsal setules curving forward. 

 Antenna 1 (Fig. 30) shovtor tliau antenna 2, geniculate between the l*^"^ and 

 2'^ Joint, 1*^*^ abouttwiceaslong as 2"^ and 3'^ combined, accessory flagellum small. 

 2-joiuted, flagellum with calceoli on upper margin in ö . Antenna 2, ultimate 

 Joint of peduncle shorter than penultimate, flagellum 

 short in 9, long, with calceoli, in c5. Mandible. 

 cuttiug plate narrowly produced, simple, few spines 

 in spiue-row, 3** Joint of palp narrow, curved. Maxilla 1, 

 inner plate with many setae, 2*^ Joint of palp with 

 apex incurved, hairy. Maxillipeds, outer plates rather 

 Short, with strong spines on inner margin, 2*^ Joint 

 of palp large, hairy, strongly produced at inner apex, 

 3*^ narrow, incurved, 4*'' small. Gnathopod 1, 6^^ Joint 

 oval, shorter than 5^^ scarcely subchelate, finger smalk 

 Gnathopod 2, fringed with long setae, the 6*^ Joint slenderly subfusiform, 

 finger wanting. Peraeopods 1 and 2 short, with 4*^' Joint rather stout. Peraeo- 

 pod 3 doubly geniculate in posture, 2*^ Joint narrowest at the base, 4^'' 

 expanded, setose, 5*'^ and 6^'^ narrow, 7^^ wanting. Peraeopod 4, 2'^' and 

 4^^^ "joints more expanded tlian in peraeopod 5, both pairs with finger rudi- 

 mentary, and having terminal joints fringed with setae and gi'oups of spines. 

 Uropod 3, outer ramus long, 2-jointed, inner small, laminar. Telson cleft 

 to base, carrying spines on truncate apices and outer lateral margins. 



5 species accepted, 1 doubtful. 



Peduncle, 

 1" Joint 



Acces.sory 

 flageUum 



Fig. 30. 



B. guiUiamsoniana. 



Anteuna l. 



