115 



antennae I, in males shorter; the three segmented flagellum consists of a 

 narrow and long proximal segment and two small distal segments. 



The mandibles have a long palp, much longer than the body of the 

 mandible. Maxillae I have a strong outer lobe armed on the distal margin. 



The maxillipeds have a narrowly oval, highly armed outer lobe and 

 a small tapering inner lobe. 



Pereopods I have a distally highly broadened, almost triangular 5th 

 segment and a conical or ovally conical 6th segment. Pereopods II are 

 longer than pereopods I; their 5th segment is weakly broadened, and the 

 6th segment narrowly conical. Pereopods IV are longer than pereopods III. 

 Pereopods V are simple or have a weakly developed subchela. Pere- 

 opods VI are longer than pereopods V, but with the same length ratios, 

 always simple, and with a long strong claw. Pereopods VII are shorter 

 and weaker than pereopods VI; the claw is either free or partly retractile, 

 sometimes forming with the 6th segment a weakly developed subchela. 



Type species: Mimonecteola diomedeae Woltereck, 1909. 



An analysis of the material available to us of the genus Mimonecte- 

 ola from various regions of the ocean and of the published information, 

 100 revealed that specimens could be separated into groups exhibiting at least 

 slight but stable differences. We consider these groups to be different 

 species, although possibly they are lower in rank. 



The genus Mimonecteola comprises five species, one of 

 which — M. macronyx Barnard — has been so cryptically described and 

 fragmentarily and schematically illustrated that its structure cannot be 

 compared with the other species; as a nomen dubium it must be excluded 

 from consideration. 



KEY TO SPECIES OF GENUS MIMONECTEOLA 



1 . All pereopods simple, without subchelae and retractile claws 2. 



— Pereopods V with subchela, although latter poorly developed; pere- 

 opods VII with partly retractile claw 3. 



2. Fifth segment of pereopods III, IV, and VI elongated-oval; 6th seg- 

 ment of pereopods V almost not narrowing distally, bearing tuft of 

 strong setae at base of claw 2. M. diomedeae Wolt. 



— Fifth segment of pereopods III, FV, and VI with parallel margins; 6th 

 segment of pereopods V narrows distally, without special ornamen- 

 tation at base of claw \. M. beebei Shoem. 



3. Sixth segment of pereopods V broad, with weakly developed sub- 

 chela formed by long thin claw and long, undulating, well-developed 

 palmate margin armed with strong spines. Pereopods VII with long, 

 almost straight, partly retractile claw ..... 4. M. subchelata Vinogr. 



— Sixth segment of pereopods V with barely perceptible subchela 

 formed by thin claw and steep, poorly developed palmate margin 



