46 PROCEEDINGS OF THE NATIONAL MUSEUM vol.82 



SCHMACKERIA POPPEI (Stingelin) 



Plate 22, Figitees 5, 6; Plate 23, Figueb 1 

 Pseudodiaptomus poppet Stingeun, 1900, pp. 200-204, pi. 14, figs. 6-10. 



Feviale. — The head and the first thoracic segment are fused. The 

 sides of the last thoracic segment are rounded; there are two dorsal 

 spines on this segment and rows of small spines on its sides. The 

 abdomen has four segments ; the first three segments have spines on 

 their distal borders. The first antennae have 22 segments. In the 

 fifth foot (pi. 23, fig. 1) the first segment of the exopod has a rather 

 stout external spine and a marked projection of the inner distal 

 angle. The second segment of the exopod has an elongated terminal 

 hook with a hook-shaped branch at its base, a stout terminal spine, 

 and a small lateral spine. 



Length, 1.36 mm. 



Male. — In the right fifth foot (pi. 22, fig. 5) the exopod consists 

 of three segments. The first segment has a spinous projection, which 

 is as long as the second segment; the second segment has a short 

 spine at the distal third of the outer border; the third segment is 

 irregularly curved and about equal in length to the second segment; 

 the terminal hook is short, nearly straight, and its sides are armed 

 with short hairs. The second segment of the basipod of the left 

 foot (pi, 22, fig. 6) has two processes extending distad to about the 

 end of the first segment of the exopod; one process is spatulate and 

 the other pointed. The first segment of the exopod has a spine 

 at its outer distal angle. The second segment of the exopod is 

 longer than the first, is irregular in outline and is lobed at the distal 

 end ; it has a stout dentate spine about midway of the outer border, 

 a group of hairs about midway of its inner border, and, at the end, 

 five short curved spines. 



Length, 1.1 mm. 



Occurence. — Found in a pond in Celebes. 



SCHMACKERIA SERRICAUDATUS (T. Scott) 



Plate 22, Figures 2, 3 



Heterocalanus scrricaudatus T. Scott, 1893, pp. 40, 41, pi. 2, figs. 43-48, pi. 3, 



figs. 1-7. 

 Pseudodiaptomus scrricaudatus Giesbrecht and Schmeil, 1898, p. 66. — A. Scott, 



1902, p. 404, pi. 1, fig. 6. 



Female. — ^Head narrowly rounded. The sides of the last thoracic 

 segment are rounded and bear several small spines. The abdomen is 

 4-segmented, and the distal borders of the first three segments are 

 armed with spines. The branches of the furcal rami are compara- 

 tively short. The first antennae have 22 segments and reach the 

 third abdominal segment. 



