414 PROCEEDINGS OF THE NATIONAL, MUSEUM vol. 83 



Ten-segmented oviger in both male and female, provided with 

 a terminal claw, and last four segments armed with an 

 inner row of elongate teeth ; body elongated and distinctly 



segmented ; 4 pairs of walking legs Nymphon Fabricius 



&. Chelae short and thick; eye tubercle pointed and turret- 

 shaped; legs fairly well armed with slender spines (fig. 



33, g-k) Nymphon turritum, new species 



c^ Chelae long and slender ; eye tubercle heavy at base and 

 with slender tip; legs almost naked (fig. 33, a-d) 



Nymphon solitarium, new species 

 &^ Palpi absent ; oviger present only in male and without termi- 

 nal claw ; body elongated, segmented ; eye tubercle borne on 

 anteriormost part of anterior segment ; 4 pairs of legs ; gen- 

 ital apertures in both male and female on all 4 legs 



Phoxichexidiidae Sars 

 Ovigera 5-segmented ; first trunk segment not greatly pro- 

 duced in front above proboscis 



(Phoxichilidium Edwards) P. femoratum (Rathke) 



a^ Cheliferl weakly developed, shorter than proboscis, not chelate 



in adult forms ; palpi usually longer than proboscis ; ovigera 



present in both sexes, 10-segmeuted and without terminal 



claw ; 4 pairs of legs ; genital openings in male on legs 3 and 



4, in female on all 4 pairs Ammotheidae Dohru 



&\ Cheliferi 2-segmented, palpi 8-segmented Ammothea Leach 



&. Cheliferi half as long as proboscis ; abdomen reaching only 

 to second coxal segment of posterior legs or slightly be- 

 yond (fig. 33, e, f) Ammothea discoidea, new species 



<f. Cheliferi less than half as long as proboscis ; protuberance 

 on dorsal side of first coxal segment half as long as seg- 

 ment, genital protuberance same length Ammothea alaskensis Cole 



^>^ Cheliferi 3-segmented, palpi 9-segmented 



(Ammothella Verrill) A. longicaudata (Stimpson) 



Genus NYMPHON Fabricius 



NYMPHON SOLITARIUM, new species 



FiGUKE 33, a-d 



Description. — Body slender, elongated, segmentation conspicuous, 

 lateral processes widely separated, legs very long and slender. 

 Trunk segments almost equal in thiclmess, except posterior segment, 

 which is slenderer; segments of approximately same length, each 

 thickest where lateral processes originate, a little behind middle of 

 segment. Anterior segment bearing high eye tubercle dorsal to 

 origins of ovigera, which are anterior to walking legs; eye tubercle 

 heavy and abruptly pointed distally, with eyes large and basal, 

 sometimes almost contiguous (in some specimens eyes hardly visible 

 and may be rudimentary). Anterior segment in front of eye tubercle 

 prolonged into neck, which is swollen anteriorly, bearing the cheliferi 

 dorsally, palpi laterally, and proboscis anteroventrally. Proboscis 



