NO. 1 BARNARD : AMPHIPODA OF THE FAMILY AMPELISCIDAE 3 



Order AMPHIPODA 

 Suborder GAMMARIDEA 



Family Ampeliscidae 



Antenna 1 without accessory flagellum; eyes when present, exter- 

 nally simple, usually four in number; mandible with palp, cutting edge 

 of molar ridged; article 3 of gnathopod 2 not elongate; telson cleft; 

 pleon segments 5 and 6 coalesced ; inner and outer lobes of lower lip 

 well developed; peraeopod 5 structurally different from peraeopods 3 

 and 4. 



Remarks: Stebbing (1906) states that the fourth article of peraeo- 

 pod 1 is usually more setose than that of peraeopod 2. This is probably 

 a typographical error; in the present materials, peraeopod 2 is always 

 more setose than peraeopod 1. 



Genus AMPELISCA Kr<£yer 



Ampelisca Kr^yer (1842), Naturh. Tidssk., vol. 4, pp. 154-155. 



Type Species. — Ampelisca eschrichtii Kr</>yer (1842). 



Peraeopod 5 : article 2, lower edge without setae between its ex- 

 pansion and the third article; article 6 foliaceous or rather slender, 

 article 7 lanceolate. 



Remarks: Characters which appear to be rather constant in the ma- 

 terial at hand and which will not be discussed in the descriptions of the 

 species are the following: Palp of mandible borne on a large process 

 (Plate 11, figure D), accessory plate well developed and reaching as far 

 as primary cutting plate. Inner plate of maxilla 1 conical or stout- 

 lanceolate (Plate 11, figure C), armed apically with 2 setae, palp article 

 2 widened apically. Maxilla 2 generally showing the form of Plate 11, 

 figure H, but occasionally modified as noted under the species concerned. 

 Palp article 3 of maxilliped (Plate 11, figure J) produced distally, ar- 

 ticle 4 slender, armed with a spine and several echinulate setules. Coxae 

 1 to 4, lower edge with 1 to 2 rows of setae; coxa 4 large, posterior 

 upper one third strongly incised. Inner edge of article 7 of gnathopods 

 1 and 2 (Plate 15, figure C) lined with several setules. Peraeopod 2 

 larger than 1, article 4 larger and more setose in peraeopod 2, and poste- 

 rior edge of article 3 setose in peraeopod 2. Anterior edge of article 2 

 of peraeopod 3 rounded, setose; anterior edge of article 2 of peraeopod 

 4 subquadrate in outline, not as strongly setose as in peraeopod 3. 



