716 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxl 



First segment with anterior margin straight, the posterior slightly 

 and broadly emarginate in the middle, curved cephalad on each side; 

 posterior corners somewhat greater than a right angle, rounded; a dis- 

 tinct lateral margin continuous in front nearly to the middle of the 

 segment, posteriorly broader and becoming obsolete at the posterior 

 corner; the segment is evenly convex in general contour, the cariniv 

 not being tilted as in Omodesmns. 



Segments 2 to 4 with lateral margins distinct and continuous along 

 the anterior <n\ix,e, but not on the posterior; their carime not tilted out 

 of the general dorsal curve, though the anterior corner of the second 

 segment, like that of the first, is strongly decurved. 



Segments dorsally nearly even, the surface even and shining, faintly 

 coriaceous or rugulose under a lens; on posterior segments very nearly 

 obsolete granules in transverse rows can be traced under a lens. 



Lateral carinie about one-fourth as wide as the body cavity; thick- 

 ened margins distinct, continued in fine ridges on the anterior and 

 posterior edges, twice as broad on poriferous as on the other segments; 

 marginal callus of fifth segment broadest, the pore located nearer to the 

 mesial edge than to the margin and somewhat behind the broadest part 

 of the callus, which is distinctly narrowed caudad; on other segments 

 except the seventh the callus is as broad o])posite the pore as elsewhere 

 and tapers almost equally to both ends. 



Below the carinte the segments are more or less rugulose and with a 

 distinct prominence at the middle of the base of thecarinte; as this 

 prominence does not appear on jioreless segments, it is jirobably cor- 

 related with the presence of the repugnatorial gland. 



Above the base of the posterior leg of each segment is a distinct 

 longitudinal row of granules or secondary carina. 



Anterior subsegments faintly rugulose-punctate under a lens. 



Penultimate segment with the apices of the rather short carinne 

 sometimes equaling or slightlj'' exceeding the posterior corners of the 

 eighteenth. 



Last segment with the exposed basal portion rather long; the pro- 

 jecting triangular part broad, the apex rather broadly punctate, the 

 setiferous punctations not located on tubercles. 



Anal valves vertically rugulose, especially below ; the setiferous tuber- 

 cles small; the margins thin and prominent, not greatly exceeded bj^the 

 apex of the last segment. 



Preanal scale rugulose; the setiferous tubercles distinctly conic, pro- 

 jecting somewhat ventrad, scarcely equaling the minutely apiculate 

 apex. 



Sterna densely hirsute with long hairs, especially on the posterior 

 slopes of the very prominent transverse ridges. 



Process of the sternum of the sixth segment somewhat longer than 

 broad, quadrate, with a small median apiculus; the process is rather 

 densely hirsute with short hairs, except the apiculus; antically the 



