Genus Bowmaniella, n.g

Archaeomysis .— Tattersall, 1932, 1951: 86 (in part, not Archaeomysis Czerniavsky, 1882).

Gastrosaccus .— Tattersall, 1951: 89 (in part, not Gastrosaccus Norman, 1868). Bowmaniella Bäcescu, 1968: 356 . (nomen nudum).

Bowmaniella (Coifmanniella) Bäcescu, 1968: 356 (in part) (nomen nudum).

Diagnosis. Carapace with posterodorsal margin having mid­dorsal lobe convex and adjacent medial lobes quadrate not attenuated or reflected anteriorly (Fig. 8 F). Abdominal segment 5 with articulated process present on posterodorsal margin. Third male pleopod highly modified; terminal male without bow (Figs. 2 D), or if bow present (Fig. 6 D, E), lacking apophysis; penultimate male lacking ventral process on outer branch, inner stylet present on inner branch (Figs. 2 C, 6C). Uropodal endopod lacking small spiniform­setae immediately distal to statocyst (Fig. 5 A, B). Telson cleft shallow, less than 15% of telson length (Fig. 4 A, B).

Type species. Gastrosaccus dissimilis Coifmann, 1937, here designated.

Other species. Bowmaniella banneri (Băcescu, 1968) .

Etymology. The genus was named in honour of the late Thomas Bowman, Senior Curator of the Division of Crustacea, National Museum of Natural History, The Smithsonian Institution.

Remarks. As now defined Bowmaniella n. g. contains two species, the type B. dissimilis (Coifmann, 1937) from the western Atlantic, and its eastern Pacific cognate, B. banneri (Băcescu, 1968) . Bowmaniella is characterized by: (1) an articulated, posterodorsal process on the fifth abdominal segment (see Fig. 1); (2) the ultimate or terminal male form with third pleopod lacking a bow, or if bow present, lacking apophysis; (3) the penultimate male form with third pleopod lacking ventral process on outer branch and having an inner stylet present on inner branch; (4) lacking small spiniform­setae posterior to the uropodal statocyst; and (5) the posterodorsal margin of carapace having mid­dorsal lobe convex with adjacent medial lobes quadrate, not attenuated or reflected anteriorly. Based on examination of type material and the literature, two of the four nominal species attributable to Bowmaniella n. g. are synonyms. The status of these synonymies is discussed in the remarks section for the type species.