164 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.40. 



produced, the anal valves with prominent margins, the coxae of the 

 fifth pair of legs of males armed with processes, the ventral plate of 

 the coleopods large, and the anterior lobes widely separated. 



Description. — Body rather small and slender, over ten times as long 

 as broad, cylindrical, slightly thicker in front, the sixth and seventh 

 segments of the male distinctly wider. 



Antennae rather short, subclavate, joint 6 the longest, slightly 

 exceeding joint 2 ; joints 3-5 subequal, distinctly shorter than joint 6. 

 Antennas accommodated by a large lateral depression of the head 

 and mandibular^ stipe, but the cardo with a prominent raised rim 

 fitting against the emargination of the first segment, so that the 

 antennas are excluded. Olfactory cones four. 



Eyes of more than 40 flattened ocelli arranged in six or seven 

 vertical curved rows. 



First segment much longer in the middle than in Anelus, much 

 shorter on the sides ; distinctly broader than the second segment, dis- 

 tinctly narrowed by a broad emargination below the level of the eyes, 

 but with rounded lateral angles, both the emargination and the angle 

 bordered by a very distinct, rather narrow ridge. Second segment 

 slightly exposed below the first when viewed from the side, but with- 

 out a crest as in Anelus. 



Segments of middle of body with a slight constriction a little in 

 front of the posterior suture, the hindbelt and midbelt about equally 

 convex. Sutures not indicated by superficial striations, but becom- 

 ing distinct as white lines as the animals dry out, except the median. 

 Forebelt nearly smooth, the striations extremely fine and indistinct. 

 Midbelt rather sparsely covered with short curved striae deepening to 

 a row of distinct punctations in the constriction. 



Hindbelt above smooth and shining, the lateral and ventral stria- 

 tions rather few and weak, and confined to the hindbelt, but the con- 

 striction with more numerous short striations below, replacing of the 

 dorsal punctures. 



Repugnatorial pores nearly on the middle line of side, inserted in a 

 distinct circular depression slightly separated from the posterior 

 suture that bends slightly away from the pore. Lateral suture some- 

 times indicated by a slight groove behind the pore. 



Supplementary margin rather thick and firm, the edge irregularly 

 erose-dentate with short, broad, square or rounded teeth, not regu- 

 larly pectinate with fine teeth as in Anelus. 



Pleural sutures very faintly indicated on the smooth surface, but 

 often marked by a whiter line, especially along the forebelt and mid- 

 belt. 



Sterna quadrate, a little broader than long, the surface covered 

 with close regular transverse striations. 



