42 PROCEEDINGS OF THE NATIONAL MUSEUM vol.82 



No process on second segment of basipod of right fifth foot of 

 male ; in female two spines on dorsal surface of last thoracic 

 segment poppei (Stingelin) 



4. An endopod on right fifth foot of male 5 



No endopod on right fifth foot of male 6 



5. Process of second basipod of left fifth foot of male consisting of 



a broad blunt-pointed expansion of the segment annandalei (Sewell) 



Process of second segment of basipod of left fifth foot of male 

 long, slender, and sinuate serricaudatus (T. Scott) 



6. Process of second segment of basipod of left fifth foot of male 



having a broad spine on its dorsal border near the base, per- 

 haps indicative of the 2-branched condition seen in smithi, 



tollingeri, and poppei 7 



Process having no spine or indication of division 8 



7. All furcal setae of female of approximately same width ; external 



spine of first segment of right exopod of male as long as sec- 

 ond segment forbesi Poppe and Richard 



Third furcal seta of female much broader than others ; external 

 spine of first segment of right exopod of male shorter than 

 second segment inopinus Burckhardt 



8. In male process of second segment of basipod of left fifth foot 



pointed ; in female third furcal seta broader than others. 



binghami (Sewell) 

 In male process of second segment of basipod of left fifth foot 

 rounded; in female furcal setae of approximately equal 

 width lobipes (Gurney) 



SCHMACKERIA ANNANDALEI (Sewell) 



Plate 20, Figure 8 ; Plate 21, Figure 1 



Pseudodiaptomus annandalei Sewell, 1919, pp. 5-7, pi. 10, fig. 9; 1924, p. 787 

 pi. 44, fig. 2. 



Female. — The head is fused with the first thoracic segment. The 

 rostrum is bifid. The last thoracic segment is rounded and has on 

 each side a comb of six to eight coarse teeth. The abdomen has four 

 segments. The first segment is produced on each side into a large 

 recurved spine. Segments 2 and 3 have spines on the distal 

 borders. The furcal rami are short and ciliate on the inner borders. 

 The third seta is much broader than the others. The first antennae 

 have 21 segments and reach the second abdominal segment. In the 

 fifth foot (pi. 21, fig. 1), according to Sewell's figure, it appears 

 probable that the second segment of the exopod has a small outer 

 spine, a hook with a long slender spine from its base, and a rather 

 broad inner spine; it seems that the separation of the hook from 

 the second segment of the exopod is not shown in the figure. 



Length, 1.18 mm. 



Male. — Sewell states that the male fifth foot consists of three seg- 

 ments, which he considers as belonging to the exopod. An examina- 

 tion of his figure (pi. 20, fig. 8), which, evidently, was imperfectly 



