iiET. 18 SYNOPSIS OF CALANOID CRUSTACEA — MAESH 31 



Female. — Head and thorax united. Rostrum bifid, with long fila- 

 ments. The last thoracic segment terminates in lateral spines, (PI. 

 15, fig. 3.) The abdomen consists of four segments; there are spines 

 on the distal margins of the first three segments. The furcal rami 

 are seven or eight times as long as broad. The first antennae consist 

 of 20 segments and extend to the second abdominal segment. The 

 exopod of the second antenna is 7-segmented. (PL 15, fig. 5.) In the 

 fifth foot (pi. 15, fig. 7) the first segment of the exopod is elongated. 

 The second segment of the exopod, according to Cleve, terminates in 

 three plumose setae, the central being about twice as long as the 

 inner; Thompson and Scott figure one elongated seta and three 

 spines. 



Length, 1.2 mm. 



Male. — The right fifth foot (pi. 15, fig. 6) has a short endopod 

 armed with three spines. From the first segment of the right basi- 

 pod, the second basipod, and the first exopod there are elongated lin- 

 guiform projections; the one from the first segment of the exopod 

 exceeds in length the second segment. The terminal hook is rather 

 short and falciform. The left fifth foot has no endopod. The first 

 segment of the exopod has a long, slender spine at its outer distal 

 angle. The second segment is oval in outline and has a lateral 

 spine at about one-third of its length. 



Occurrence. — Found in Malay Archipelago, Indian Ocean, Dutch 

 East Indies, and Bay of Bengal under marine conditions. 



PSEUDODIAPTOMUS CLEVEI A. Scott 



Plate 16, Figxxres 1, 2 

 Pseudodiaptomus clevei A. Scott, 1909, pp. 116, 117, pi. 37, figs. 1-8. 



Female. — The wings of the last thoracic segment are pointed ; there 

 are two dorsal spines in the surface of this segment. The abdomen 

 has four segments ; there are spines on the distal margins of the first, 

 second, and third segments. The first antennae have 21 segments 

 and extend to the fourth abdominal segment. In the fifth foot 

 (pi. 16, fig. 1) there are two spines at the inner distal angle of the 

 second segment of the basipod. The second segment of the exopod 

 has an acute spine at the outer distal angle, a terminal spine or hook 

 which has a broad spine near its base, and a broad inner spine which 

 is nearly as long as the terminal central spine. 



Length, 1.75 mm. 



Male. — The fifth foot (pi. IG, fig. 2) has no endopods. The lateral 

 spine of the second segment of the exopod of the right foot is long 

 and slender, reaching the end of the terminal hook. The second 

 segment of the exopod of the left foot is oval in outline, the end 



