^30 Nototropis 



1. N. falcatus (Metzg.) 1871 Atylus f., Aug. Metzger in: Jahresber. Ges. 

 Hannover, u 21 p. 28 | 1889 A. f., Hoek in: Tijdschr. Nederl. dierk. Ver., ser. 2 v.2 

 p.l95 t.8 f. 2, 21 1 1893 A. f., A. Della Valle in: F. Fl. Neapel, ».20 p. 703 | 1888 A.f., 

 Tritaeta?, T. Stebbing in: Rep. Vby. Challenger, v. 29 p. 408 | 1882 A. uncinatus, G. 0. 

 Sars in: Forh. Selsk. Christian., nr. 18 p. 101 t. 5 f. 3, 3a | 1893 & 95 Par atylus falcatus, 

 F. u., G. O. Sars, Crust. Norway, v. 1 p. 465 t. 164 f . 1 ; p. 697 | 1895 P. f. -f P. u., 

 A. 0. Walker in: P. Liverp. biol. Soc, v.9 p. 306. 



Resembles N. swammerdamei except in the following poiuts. Pleon 

 Segments 1 — 3 produced (not so in Aiylns wicuiatm 0. Sars) to a small dorsal 

 tooth. Side-plate 1 tapering distally, 4*'^ little broader than 3*^. Antenna 1 in Q 

 scarcely Vs ^^ long as body, flagellum little longer than peduncle. Antenna 2 

 much longer, ultimate Joint of peduncle not nearly twice as long as pen- 

 ultimate, flagellum not as long as botli combined. Gnathopod 1 less strongly 

 built. Gnathopod 2, G^h JQJut; narrowly oblong, palm very oblique, subequal to 

 bind margin. Peraeopod 1 strong, 5*^ Joint very short, cup-shaped, 6*^ curved, 

 with strong spines at base, finger huge, falciform, fitted for clasping. Peraeo- 

 pod 2 very small, 5**^ — 7*^^ joints almost rudiraentary. Peraeopods 3 — 5, 5**^ 

 Joint much longer than ö**', finger reversed, 2'^ Joint in peraeopod 5 broader 

 and with more convex bind margin than in the other species. Colour rather 

 pellucid, with scattered brownish patches (Sars) or white with a red spot on the 

 back of each segment except pleon segment 4 (Walker). Ij. 9 5 — 7 mm. 



Arctic Ocean, North- Atlantic and North-Sea (Norway, East Frisian coast, Holland, 

 France, North- AVest England, Wales). 



2. N. swammerdamei (M.-E.) 1830 Amphithoes., H. Milne Edwards in: Ann. 

 Sei. nat., r.20 ]). 378 1 1840 Amphitoe sivammerdamii, H. Milne Edwards, Hist. nat. Crust., 

 V. 3 p. 35 I 1876 Atylus s., A. schu'ammerdamii, A. Boeck, Skaiid. Arkt. Amphip., v. 2 

 p. 328 t. 21 f. 5; t. 22 f . 1 | 1879 A. swammerdammii, Hoek in: Tijdschr. Nederl. dierk. 

 Ver., V.4: p. 134, 152 t. 10 f. 1 — 6 | 1893 A. swammerdamii (part.). A. Della Valle in: 



F. Fl. Neapel, ».20 p. 698 t. 3 f. 12; t. 17 f. 1-21 i 1893 Paratylus sirammerdami, 



G. 0. Sars, Crust. Norway, v.l p. 463 t. 163 | 1895 P. swammerdamii, A. O.Walker in: 

 P. Liverp. biol. Soc, v.9 p. 305 | 1852 Amphithoii comp^-essa, W. Liljeborg in: Ofv. Ak. 

 Förh., ». 9 p. 8 | 1859 Paramphithoe c, ß. M. Bruzelius in: Svenska Ak. Handl., n. ser. 

 ».3 nr. 1 p. 72 | 1861 Amphithoe c, Epidesura sp. typ., A. Boeck in: Forh. Skand. 

 Naturf., Mgde 8 p. 659 ] 1857 Dexamine gordoniana, Bäte in: Ann. nat. Hist., ser. 2 

 r. 19 p. 142 I 1862 D. loughrini -\- Atylus sivammerdamii -\- A. compressns, Bäte, Cat. 

 Amphip. Brit. Mus., p. 132 t. 24 f. 3; p. 136 t. 26 f. 2; p. 142. 



None of the segments produced to a dorsal tooth except 4k^^ of pleon, 

 the following composite segment ending in a little spinulose hump. Head, 

 rostrum rather short, lateral margin bilobate, lobes rounded, post-antennal 

 Corners not produced. Side-plates 1 — 4 much larger and deeper in 9 than 

 in <S , P* not tapering, 4**^ slightly emarginate, front lobe of 5^^ rounded. 

 Pleon segment 3, p oster o-lateral corners quadrate, with small acutely produced 

 point. Eyes oblong reniform, larger in ö than in 9, dark brown with 

 whitish coating. Antenna 1 in 9 more than ^/^ length of body, 1^* Joint 

 as long as 2*^ and 3*^ combined, flagellum not quite twice as long as 

 peduncle, about 24-jointed. Antenna 2 in 9 little louger, ultimate Joint of 

 peduncle nearly twice as long as penultimate, flagellum about equal to both 

 combiued. Auteunae 1 and 2 in d much longer, with fascicles of setules 

 on confronting edges of peduncles. Gnathopod 1, ö**^ Joint shorter than 

 the 6*^, which is rather stout, ovate, front margin with many series of 

 spiuules. palm very oblique, not strongly defined. Gnathopod 2 longer, more 

 slender, 5*^ Joint nearly as long as 6*'\ which is narrow, with short, moderately 



