isopoDs OF Noirrri amkrkw. 



298 



Miciil, iM(li(;itiii<4' pailly coalesced seuniciils. 'I'lie leniiiiial seiiUieiit 

 has two tiilxM'cles situatefl on the coincx dorsal surlace, one on oithcM* 

 ■side of the ni(>dian line, about the middle of tho seonuMit. This seg- 

 uieiit terminates posteriorly in three small teeth, one median and one 

 lateral to this on either side. The inner fixed branch of the uropoda 

 does not extend ))evond the tip of the terminal abdominal seo-ment. 

 Th(» outer post-la tei'al anjj'le is very acute. The outei- branch of th<' 

 uro])()da is \erv lono- and extends beyond the imier l)ranch a distance* 

 equal to half the lennlli of the* iiuiei- bi-anch. ll teiiniiiat<'s jn :i lono- 

 acute extremity. 



Only one specimen of this species was lak(Mi in Florida b\ Pi-of. 

 A. S. Packard. 



The type is in the Museum of Comparative Zoology at Harvard 

 College. Cat. No. ()78ii, M. C. Z. 



This speci(\s is namea for Prof. W. S. Faxon, who very kindly 

 assisted me 1)}' letting me have foi- exan)ination the collection in the 

 Museum of Comparative Zoology at Harvard University. 



EXOSPHiEROMA OCTONCUM (Richardson). 



S/iliiiroiiKi iictuiicHiii Kicii AKDsoN, Proc. U. S. Nat. Mus.,XXI, 1S()7, p. Slid; Ann. 

 Mag. Nat. Mi.< (7), IV, ISHO, p. ISO; American Xatnralif^t, XXXIV, 1900, 

 p. 22:!. 



Locality. — Moutere}' Bay, California. 



Body with all the thoracic^ segments, except the first, marked with 

 four conspicuous })rown spots, two on either side of the median line, 

 and with two spots on the first abdominal segnnwit, one 

 on either side of the median line. 



Head small. First pair of antenna* reach almost to 

 the posterior margin of the tirst thoracic s(>gment. S(»c- 

 ond pair extend fully to the posterior niiu-gin of th(> tirst 

 segment. 



Thoracic segments subequal. Epimera broad and ex- 

 tending downward, forming an angle with the segments. 



First abdominal segment with 

 two low^ tubercles close together, 

 situated oiie on either side of the ^"'- 309.-exos- 



I'H.EROM.\ OC- 



m(>dian line; terminal segment toncum. max- 

 triangular, with apex narrowly '^-liped. x5i|. 

 rounded and sides slightly infolded, forming a 

 small opening when seen from below. Six low 

 tubercles are situated on this segment, two in 

 longitudinal series on either side of the median 

 line — the lower ones being a little farther apart than the upper 

 ones— and one on either side of the scries. The uropoda do not reach 



FlO. 310.— EXOSPH.HROMA OC 

 Tom TM. ABDOiMKN. \ 13;. 



