500 Ainathillina 



6*^*^ Joint in gnathopod 1 rather broader and more expanded distally than in 

 gnathopod 2, where it lias a rather narrow oblong oval form, palm in both 

 somewhat oblique, detined by an obtuse angle carrying 2 short spines. 

 Gnathopods 1 and 2 in c? much stronger, neaiiy equal, 6^^ Joint much 

 longer and broader than 5**», somewhat expanded distally, especially in 

 gnathopod 2, palm concave, defiued by a nearly rectangular corner armed 

 "with 2 spines. Peraeopods 1—5 rather more elongated in ö than in , 

 with 2^ Joint of peraeopods 3 — 5 less expanded, especially in peraeopod 5; 

 finger strong, ending in a sharp, curved point. In peraeopods 3 and 4, 2*^ Joint 

 oval, distally narrowed, but in peraeopod 5 broadly expanded behind, bind 

 margin serrate and ciliate, the broad distal lobe overlapping the 3*^ Joint. 

 Uropods 1 and 2 spinöse, peduncle longer than the subeqiial rami, uropod 1 

 much the longer. Uropod 3 short, peduncle much longer than broad, 1^* Joint 

 of outer ramus not much longer than peduncle, armed with 2 fascicles of 

 spines on each side, 2^ Joint narrow, setiferous, 7$ ^s long as 1^\ inner 

 ramus very small. Telson broader than long, nearly semicircular, lobes not 

 dehiscent, each with a spinule on outer margin, and a spinule and hairs at apex. 

 L. 9 about 13, ö nearly 15 mm. 



Caspian Sea. Depth 4 — 6(> m. 



2. A. pusiUa 0. Sars 1896 A. p., G. O. Sars in: EuU. Ac. St.-Petersb., ser. 5 

 V.4: p. 446 t. 5 f. 15 — 25. 



Body very short and stout, especially in 9 . Peraeon segments 1 — 5 

 dorsally quite smooth ; segments 6 and 7 and pleon segments 1 — 3 carinate, 

 each produced dorsally to a distinct laminar projection, the tirst 4 triangulär, 

 the last rounded, gibbous. Pleon segments 4 — 6 with dorsal hairs. Head 

 larger, side-plates 1 — 4 smaller than in the other species. Eyes oval reniform. 

 Antenna 1 "very slender and elongate, 1^* Joint nearly as long as 2*^ and 3*^ 

 corabined, flagellum twice as long as peduncle, about 16-jointed, accessory 

 flagellum in 9 2-, in ö 3-jointed. Antenna 2 much the shorter. Gnathopod 1 in 9 , 

 6**1 Joint rather broad, oval, palm oblique; gnathopod 2, 6*^ Joint unusually 

 narrow, oblong linear, palm very short, almost transverse. Gnathopods 1 

 and 2 in d powerful, nearly equal, 6^^ Joint in both large and tumid. 

 Peraeopod 5, 2*^ Joint well expanded. bind margin serrate rather strongly, 

 the distal lobe more produced in the 9 than in the ö, rather narrowiy 

 rounded. Uropod 3, peduncle thick, scarcely longer than broad, outer ramus 

 little longer than peduncle, with terminal but no lateral spines, its 2'^ Joint 

 and the inner ramus very small. Telson broader than long, lobes not 

 dehiscent, each with a minute spinule on the obtusely truncate apex. L. 4 mm. 



Caspian Sea. Siiblitoral. 



3. A. maximoviczi O. Sars 1896 A. m., A. niaximovitschi, G. 0. Sars in: Bull. 

 Ac. St.-Pctersb., ser. 5 v.A p.444; t. 5 f. 1—14. 



Body stout, peraeon not carinate, pleon segments 1 — 3 each with 

 triangulär dorsal crest, low in all, lowest in segment 3, segments 1—6 with 

 dorsal hairs. Side-plates 1 — 4 rather small; pleon segments 2 and 3, 

 postero-lateral corners minutely produced. Eyes of moderate size, oblong 

 oval, not reniform. Antenna 1, 1^* Joint much thicker and a little longer 

 than 2*^, 2'^ a little longer than 3'*, flagellum about twice as long as peduncle, 

 20-jointed, accessory flagellum 3-jointed. Antenna 2 in 9 scarcely half as long 

 as antenna 1, in ö rather longer than in 9 . Gnathopods 1 and 2 rather small 

 in 9, much stronger in Ö, with 6*^ Joint large, somewhat expanded distally, 



