42 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I48 



Genus OLENELLUS Billings, 1861 

 T)^e species. — Olenus thompsoni Hall. 



OLENELLUS, species undetermined 

 Plate 12, figures 21, 22 



Available material. — A few, incomplete cephala. 



Description. — Glabella well defined by a deep axial furrow, on 

 the average somewhat expanded forward. Frontal lobe large ; second 

 lobe short and wide, set off by narrow, fairly deep lateral furrows 

 at the sides both from the frontal lobe and the third lobe ; both pairs 

 of furrows become very shallow medially. The second lobe expands 

 laterally to touch the palpebral lobe, from which it is separated by an 

 oblique furrow, extension of the first pair of glabellar furrows. Third 

 and fourth glabellar lobes narrower, bounded by the axial furrow 

 laterally, far from reaching the palpebral lobe; third pair of lateral 

 furrows and occipital furrow similar to second pair of furrows. There 

 was a node, broken off in the available specimens, across the occipi- 

 tal furrow, rather than on the occipital ring as usual. Palpebral lobes 

 wide, long, set off by a very shallow furrow from the frontal glabellar 

 lobe, showing a poorly defined rim, set off by an exceedingly shallow 

 furrow, representing about one-third of the width of the palpebral 

 lobe. Other cephalic parts not preserved. Length of glabella plus 

 occipital ring 4-5 mm. 



Occurrence. — Collection cs-4. North Chatham. 



Discussion. — The features of this species, as far as can be observed 

 on the incomplete cephala, agree with Olenellus, but reference to 

 other genera of the family cannot be excluded. The shape of glabella 

 and palpebral lobe shows a marked resemblance to Holmia kjerulfi 

 (Linnarsson). 



Disposition of material. — Figured specimens: U.S.N.M. 146038. 



Family DORYPYGIDAE Kobayashi, 1935 

 Genus KOOTENIA Walcott, 1889 

 Type species. — Bathyuriscus (Koo tenia) dawsoni Walcott. 



KOOTENIA, species undetermined 

 Plate 12, figures 14, 15 



Available material. — A single, incomplete pygidium. 



Description. — Pygidium of relatively low convexity. Axis wide, 

 moderately tapered, straight-sided, composed of six well-defined rings 

 plus a terminal section, reaching the posterior border furrow. All 



