38 



BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



Via. 12. CHASMOPHOKA MACROPHTHALMA, FE- 

 MALE HOLOTYPE. a, CARAPACE, EYES AND AN- 

 TENNAE, DORSAL VIEW, X 5 j I 6, RIGHT CHELA, 

 OUTER VIEW, X 7J. 



a short blunt inner tooth which is continued inferiorly as a blunt 

 prominence. Lower margin of propodus of cheliped a little sinuous. 

 The palmar portion is slightly margined above and below; fingers 

 broad and flat, not gaping, with a narrow granulate border on the 

 outer edges; prehensile margins crenate, with a slightly larger lobe 



near the base of the dactylus, 

 and a three-lobed prominence 

 at the base of the pollex. 



Color. In alcohol, the cara- 

 pace is marked with patches 

 of dark blue. 



Measurements. Female 

 holotype, length of carapace 

 3, width of same 5.1 mm. 



Material examined. Pana- 

 ma Bay; lat. 7 56' 00" N.; 



long. 79 41' 30" W.; 51| fathoms; gn. M.; March 30, 1888; sta- 

 tion 2805, Albatross; 1 female holotype (21591). 



Genus SPEOCARCINUS Stimpson. 



Speo&irvinus STIMPSON, Ann. Lye. Nut. Hist. New York, vol. 7, 1859, p. 58; 

 type, <S. carolinensis Stimpson. 



Carapace subcylindrical. Fronto-orbital width three-fifths to two- 

 thirds of the entire width. Antero-lateral margin arcuate, dentate, 

 teeth small; postero-lateral margins parallel or 

 nearly so. Eyestalks small, filling the orbits. 

 Antennules transverse. Basal joint of antenna 

 scarcely reaching the front, the next joint stand- 

 ing in the orbital hiatus. Epistome narrow ex- 

 cept at the middle. Buccal cavity strongly 

 widened anteriorly, maxillipeds gaping, the 

 merus as long as broad, its antero-external angle 

 prominent. 



Chelipeds moderately unequal, much stronger 

 than the legs 



Third pair of legs the longest. Dactyli sharp, 

 those of last pair curved upward. 



Abdomen of male much narrower at its base than the sternum; 

 third to fifth segments more or less fused. 



Restricted to America. 



Analogous species on opposite sides of the continent: carolinensis 

 (Atlantic) ; granulimanus (Pacific). 



FIG. 13. CHASMOPHORA 

 MACROPHTHALMA, AN- 

 TERIOR VIEW OF OKniT 

 OF FEMALE HOLOTYPH, 

 SHOWING HIATUS IN 

 WHICH LIES THE AN- 

 TENXAL FLAGELLUM, 

 X ABOUT 13. 



