Gammaridae, Boruta 



867 



44 s 



45 



46 



47 



48 



49 



Groups of dorsal spinules limited to 



pleon Segments 4 — 6 44. Gen. Gammarus .... 



& 47. Gen. Heterogaramaxus *) 

 Groups of dorsal spinules (Fig. 89) 



not limited to pleon segments 



4— 6 — 45. 

 Antenna 1, peduncle longer than pe- 



duncle of antenna 2 45. Gen. Poekilogammarus 



Antenna 1, peduncle shorter than pe- 

 duncle of antenna 2 46. Gen. Echinogaminarus . 



Pleon Segments 1 — 3 without median 



carina 48. Gen. Parapallasea . . . 



Pleon segments 1 — 3 with median 



carina — 47. 

 Body with median carina only — 48. 

 Body with median and lateral ca- 



rinae — 40. 

 Peraeopod 5, 2d Joint with broad 



lower hind lobe 49. Gen. Amathillina . . . 



Peraeopod 5, 2d Joint without broad 



lower hind lobe 50. Gen. Carinogaramarus . 



ßostrum long 51. Gen. Gammaracanthus 



Rostrura short 52. Gen. Aeanthogaminarus 



p.46a 

 p.494 



p.477 

 p.47» 

 p.497 



p.499 



p. 501 

 p. 507 

 p.508 



1. Gen. Boruta Wrzesn. 



1888 Boruta (Sp. un.: B. tenebrarumy Wrzesniowski in: Pam. Fizyjogr., v.8 

 p.264 1 1888 B., T. Stebbing in: Rep. Voy. Challenger, v.29 p. 1656 1 1890 B., Wrzesniowski 

 in: Z. wiss. Zool., v.50 p. 639 | 1893 B., A. Della Valle in: F. Fl. Neapel, u20 p. 647 | 

 1896 Crangonyx, Vejdovsky in: SB. Böhm. Ges., nr. 10 p. 5. 



Close to Synurella (p. 368). Pleon segments 4 — 6 coalesced (Fig. 84)» 

 Eyes wanting. Lower lip without inner lobes. Mandible, molar with a very 



Pleon segments 4— 6. 



Fig. 84. B. tenebrarum, ? . 



Lateral view. 



[After Wrzesniowski.] 



Short, apically truncate seta. Maxiila 1, inner plate with 7 setae, outer with 

 7 spines, which are apically broad and pectinate, 2"^ Joint of palp canying 

 curved setae on both the right and left maxilla. Maxillipeds with more setae 

 on outer plates than in Synurella. Telson emai-ginate, not cleft. 



1 species. 



") For the differences of these two genera see p. 494. 



