Fresh-Water Entomostraca from China and Sumatra. 17 



with mud from Sumatra. It was also found occasionally 

 in the sample taken by Mr. Iversen. 

 D i s t r i b u t i o n. — Ceylon, Australia. 



2. Diaptomiis Cliaffanjoni, Richard. 



(PI. II, figs. 1, 1 a-g). 



Diaptomus Chaffanjoni, Richard, « Sur deux Entomos- 

 tracés d'eau douce recéuillies par M. Chaff anjon en Mon- 

 golie. » Bull. d. Mus. d'hist. nat. 1887, p. 131. 



Specific Characters. — Female. Form of body rather 

 slender, with the anterior division, seen dorsally, oblong 

 fusiform in shape, greatest width about in the middle, ante- 

 rior extremity gradually narrowed, posterior but slightly 

 attenuated. Cephalosome with a slight cervical depression, 

 frontal appendages comparatively small and widely apart. 

 Penultimate segment of metasome confluent with the last 

 one, and exhibiting dorsally in the middle a very conspic- 

 uous spinitbrm protuberance pointing obliquely behind; 

 lateral lobes of last segment of moderate size, bifurcate, 

 and somewhat asymmetrical, left lobe the larger. Urosome 

 rather robust, with the genital segment comparatively large 

 and broad, forming on each side anteriorly an obtuse pro- 

 tuberance tipped with a short denticle, left protuberance 

 the more prominent. Distal part of urosome very mov- 

 ably articulated to the genital segment and generally turned 

 out of the axis of the body to left side, its 2 segments im- 

 perfectly defined. Caudal rami of moderate size and obli- 

 quely truncated at the tip, setæ normal. Anterior antennæ 

 rather slender, reaching, when reflexed, to the base of the 

 caudal rami. Last pair of legs with a well-marked denti- 

 form lobe on the hind face of 1st basal joint, unguiform 



