64 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.60 



timate joint is the shortest. The anal laminae are broad, longer than 

 the last two abdomen segments together, and each tipped with threa 

 long plmnose setae. 



The appendages are like those of the female except that the mouth 

 parts are more heavily armed with spines and setae, and in the 

 swimming legs the short spines of the female are replaced by long 

 plumose setae. 



Color similar in all respects to that of the female. 



Total length, 2.15 mm. Cephalothorax 0.86 mm. long, 0.65 mm. 

 wide. 



Internal specifc characters of feinale. — Esophagus with a sharp 

 bend near its center, opening into the ventral surface of the stomach a 

 short distance back of its anterior end. Stomach considerably en- 

 larged, but abruptly narrowed at the posterior margin of the cephalo- 

 thorax. Intestine somewhat convoluted, extending through the center 

 of the body, narrowed in the genital segment and then widened into 

 a fairly long rectum. 



Supraesophageal ganglion large and well defined ; inf raganglion a 

 long spindle reaching back to the posterior margin of the cephalo- 

 thorax. Ventral nerve running back to the fifth segment. 



Ovaries above the stomach at the posterior end of the cephalo- 

 thorax, each ovate and filled with genital protoplasm and ^%^ fila- 

 ments. The latter are divided transversely into separate cells, the 

 eggs each with its own nucleus and nucleolus. These cells are 

 separated as they pass into the oviduct and each develops into an 

 ^^z^. The oviduct opens out of the posterior end of the ovary and 

 runs through the thorax dorsal to the intestine and outside of the 

 cement glands. It is convoluted in each of the free segments, and 

 when the eggs are mature it fills practically all the space between 

 the intestine and cement glands and the dorsal and lateral walls of 

 the body. The oviducts open out of the dorsal surface of the genital 

 segment, and just before reaching the external openings, the vulvae, 

 each receives the duct of the cement gland on its side of the body. 



The cement glands are situated on either side of the midline in 

 the third, fourth, and fifth segments, dorsal to the intestine; they 

 are cylindrical in the fifth segment with a wide diameter, are nar- 

 rowed rapidly in the fourth segment, and just reach across the 

 posterior margin of the third segment; they are not segmented. 



The sperm receptacle is a large sack lying ventral to the intestine 

 in the posterior end of the fifth and the anterior portion of the 

 genital segments. It has already been noted that the spermatophores 

 are exceptionally large, and this sack is correspondingly large, since 

 it must hold the contents of two spermatophores. 



The excretory glands are not readily located, but apparently they 

 are situated at the posterior margins of the thoracic seerments, espe- 



