26 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loa 



(4-5) mm. long, without apophysis; near its junction with the head an 

 anteromedian bulging area (pulvillus) bearing minute spinules 7-10 

 microns long ; a padlike area of cuticular verrucae on the medioanterior 

 and anteromedian sides of its lower half, with a prominent, uncorni- 

 fied, anterior protuberance near the proximal end of the verrucose 

 area. The proximal article presents a more or less prominent genicu- 

 late bend as seen in lateral view, with the uncornified bulge at the 

 angle of the bend. Distal article of the antenna 2.5 (2-3) mm. long, 

 somewhat flattened laterally, curving gently inward to a pointed tip 

 with a roughened area. Thoracic appendages typical of the genus; 

 branchial lamina entire with serrated margins; endopodite produced 

 medially, the heavy spines of the distal end and median border thickly 

 beset on all sides with distally directed spinules. Second genital 

 segment with a pair of hollow eminences on ventral side. The penes 

 bear each a chitinized spur 0.26 (0.22-0.31) mm. high near the tip of 

 the rigid portion ; the retractile portions when fully protruded present 

 two distal lobes, each with 6 to 10 pyramidal teeth. Cercopods 2.3 

 (2-2.75) mm. long, distinctly articulated to the telson, with long, 

 plumose hairs on both lateral and median margins. 



Female: Total length, from front to end of cercopods, 29 (21.5-33.5) 

 mm. Average ratio of length of head and thorax to genital segments, 

 abdomen, and cercopods 1:1.48. Transversely oblong nuchal organ 

 on top of head, A retrorse, papillose protuberance, rising 0.35-0.55 

 mm. above the surface, is located on each side of the head dorsal to 

 the mandibular articulation. Compound eye in lateral view slightly 

 flattened dorsoventrally, 0.62 (0.6-0.7) mm. by 0.76 (0.6-0.85) mm. 

 Antennule 1.8 (1.5-2.5) mm. long, terminated by three setae and eight 

 aesthetascs. Antenna 3 (2.2-3.5) mm. long, cylindrical, vnih. a me- 

 dian spur 0.18-0.35 mm. long at the junction of the middle and distal 

 thirds, distal to which the antenna tapers to a sharp, incurved point. 

 Thoracic segments 6 to 11 each with a right and left dorsolateral, 

 conical protuberance, of which the last four, only, are large enough to 

 be conspicuous. The largest protuberance, 0.5 to 0.9 mm. high, usu- 

 ally on segment 10, occasionally on segment 11. Ovisac fusiform, ex- 

 tending backward for the length of 4.75 (4.3-5.8) abdominal segments; 

 may contain up to 416 eggs. Eggs from preserved specimens 0.29- 

 0.34 mm. in diameter. Cement glands consist of two closely ap- 

 pressed masses of large cells at anterior end of ovisac; from each mass a 

 row of cells extends for from 65 percent to 80 percent of the length of 

 the ovisac on its dorsal side and widens at its posterior end, and 

 similar rows of cells extend posteriorly along the midventral line for 

 about half the length of the ovisac, without the posterior expansion. 

 Shaft of cercopods 2.2 (1.9-2.8) mm. long, with long plumose setae 

 on lateral and median borders. 



