364 Paramoera, Gammaridae 



I. s., J. D. Dana in: U. S. expl. Exp., t;.13ii p.927 t.63 f. 2a— i | 1862 Atylus s., Bäte, 

 Cat. Amphip. Brit. Mus., p. 140 t. 27 f. 2 | 1880 Ä. microdenteropus, Haswell in: P. Linn. 

 Soc. N.S. Wales, v. 5 p. 102 t. 6 f. 2. 



Substantially agreeing and probably identical with P. austrina. L. 6 — 10 mm. 



South- Atlantic (Hermit Island); South-Pacific (Port Jackson, Botany Bay). 



30. Farn. Gammaridae 



1813/14 Gammaridae (part.), Leach in: Edinb. Enc, v.l p. 432 j 1882 G., G. O. 

 Sars in: Forh. Selsk. Christian., nr. 18 p. 28 | 1888 G., T. Stebbing in: Rep. Voy. 

 Challenger, r;. 29 p. 1004 | 1894 G., G. O. Sars, Crust. Norway, v.l p. 481 1 1871 & 76 

 Subfam. Gammarinae, A. Boeck, Skand. Arkt. Amphip., v.l p.74; v.2 p. 362 j 1874 

 „Gammariden", B. Dybowsky in: HoraeSoc. ent. K.oss., r. 10 suppl. p.6 | 1893 Gammaridi 

 (part,), A. Della Yalle in : P. Fl. Neapel, v. 20 p. 620. 



Body (Fig. 84, 85, 89) more er less slender, pleou segments 4 — 6 usually 

 well defined, Autennae (Fig. 86) generally rather slender, and, as a mle, but 

 little different in the two sexes; accessory flagellum of antenna 1, often 

 greatly developed, may dwindle sometimes to a Single Joint er tubercle, or 

 disappear entirely. Mouth-parts (Fig. 87, 88) normal. Upper lip with a 

 rounded, entire or only sligbtly emarginate distal border; lower lip with 

 inner lobes well developed, sligbtly indicated, or absent. Mandible with 

 dentate cutting edge and accessory plate, spine-row, molar, and 3-jointed 

 palp (only in one genus 2*^ Joint smaller than 1^'). Maxilla 1 with inner 

 and outer plate and 2-joiuted palp (only exceptionaHy 1^* Joint as large as 2*^). 

 Maxillipeds with inner and outer plates and palp well developed. Gnatho- 

 pods 1 and 2 generally ratber powerful, rarely less than subchelate, seldom 

 both weak; sometimes stronger and larger in d than in Q. Peraeopods 

 more or less slender, sometimes stout, sometimes 2^ joint in peraeo- 

 pods 3—5 little expanded. Pleopods lose only by exception one ramus and 

 uropod 3 one or both of the rami. üropod 3, rami more or less foliaceous, 

 projecting beyond uropods 1 and 2; uropod 3 and telson never hooked. 

 Telson (Fig. 89 p. 481) either with entire margin or cleft to the base, 

 sometimes strikingly different in the two sexes. 



The greater part of the family lives in fresh and brackish water of seas, lakes, 

 rivers; also in wells and other subterranean waters; rarely in the ocean. Cosmopolitan. 



52 genera, 243 accepted and 48 doubtful species. 

 Synopsis of genera: 



/ Pleon (Fig. 84), segments 4—6 coa- 

 ) lesced — 2. 



I Pleon (Fig. 85), segments 4 — 6 not 

 ' coalesced — 3. 



J Eyes wanting, body pellucid .... 1. Gen. Boruta p. 367 



\ Eyes present, body not pellucid ... 2. Gen. Synurella p. 368 



J Pleopods with a single ramus .... 3. Gen. Paracrangonjrx .... p. 369 

 \ Pleopods with two rami — 4. 



J Uropod 3 without rami 4. Gen. Apocrangonjrx . . . . p. 370 



\ Uropod 3 not without rami — 5. 

 I Uropod 3 with a single ramus — 6. 

 \ Uropod 3 with two rami — 7. 



