Gmelinopsis, Hakönboeckia 415 



shorter and much imiTower, oblong quadrangular, palm neaiiy transverse. 

 Peraeopods 1—5 rather slender and spinulosa. 4*'^ longer than 3*^ or 5*''. 

 in 3"^ and 4*^' 2'* Joint oblong oval, ratber narrowed distally, larger in 

 peraeopod 4 than in 3. Peraeopod 5, 2'' Joint greatly expanded. almost 

 beart-shaped, its greatest breadtb being below, bind margin niinutely crenulate 

 and setuliferous. Uropods 1 and 2 witb subequal rami, apically tufted with 

 strong spines. üropod 3 ratber sbort and tbick, reaching little beyond tbe 

 otbers, outer ramus ratber tbick, sligbtly curved, apex of 1^*^^ Joint mucli 

 l)roader tban tbe small 2*' Joint, inner ramus less tban twice as long as 

 broad. Telson cleft nearly to base, tbe lobes tapering. tbeir narrow apices 

 Standing wide apart, eacb armed witb a spinule and a bair. L. Q 8 mm. 



Caspian Sea. Depth 53 m. 



2. G. aurita O. Sars 1896 O.a., U. (). Sars in: Bull. Ac. St.-Petersb., ser. 5 

 n4 p.437 t. B f. 20— 28. 



9. Peraeon segments 6 and 7 and pleon segments 1 — 3 witb median 

 dorsal carina formed by laminar expansions, rounded ou pleon segment 3, 

 triangulär on tbe otbers. Peraeon segments 1 — 7 witb lateral tubercles less 

 prominent tban in G. tuberculata. Pleon segments 4 — 6 sbort and stout, 

 witb small bairs dorsally, segment 6 witb a very minute denticle on eacb 

 side. Head, lateral lobes small, obtuse-angled, lateral protuberances greatly 

 developed, tbese spiniform projections extending obliquely downward and 

 looking ns seen from above like a pair of pointed ears. Side-plates 1-4 

 ratber less deep tban in G. tuberculata. Pleon segments 2 and 3, postero- 

 lateral corners subquadrate. Antenna 1, flagellum sborter tban peduncle, 

 10-jointed. Antenna 2 more than half as long as antenna 1. Telson triangulär, 

 about as long as broad at base, distally conically tapered, cleft narrow, reaching 

 only to middle, apices acute, eacb armed witb a spinule and 2 bairs. Other parts 

 nearly as in G. tuberculata, ))ut gnatbopods 1 and 2 ratber less unequal. 

 L. 8 mm. — Ö unkuown. 



Caspian Sea. Depth 203 m. 



25. Gen. Hakönboeckia Stebb. 



1899 Hakönboeckia (Sp. un. : H. strauchii), T. Stebbing in : Tr. Linn. Soc. London, 

 ser. 2 V. 7 p. 425. 



Near to Axelboeckia (p. 391) and Gmelinopsis. Peraeon segments witb 

 margins acutely produced. Head with rostral and lateral projections. Antenna 1 

 longer than antenna 2, peduncle of antenna 1 equal to peduncle of antenna 2; 

 accessory flagellum very small. Gnatbopod 1, 6*'' Joint like that of gnatho- 

 pod 2, but longer. Peraeopods 3—5. 2'* Joint broad, not produced down- 

 ward. Uropod 3, rami subequal, outer (seemingly) "l-jointed. Telson cleft 

 nearly to base. 



1 species. 



1. H. strauchii (Dyb.) 1874 Gammarus s., B. Dybovvsky in: Horae .Soc. ent. 

 Ross., r. 10 suppl. p. 112 t. 12 f. 7 | 1899 Hakönboeckia s., T. Stebbing in: Tr. Linn. Soc. 

 London, ser. 2 v.7 p. 425 | 1893 Gammarus strauchi, G.locusta (p&rt.)':!, A. Della Valle 

 in : F. Fl. Neapel, v. 20 i). 930. 



Peraeon segments 1 — 7, like sen'ate edge of a roof broadly expanded in 

 outward and downward directed pointed angles over tbe side-plates, moststrongly 

 in segments 1 — 5. Peraeon segments 6 and 7, and pleon segments 1 — 3 eacb 



