2!)\ M.W Cir.M.lxA VM> SI'l'.Cll.S OK CK'VUS 1»\IIIIU'N. 



pr(>sstMl t iibtM'clos uitt MUMitioncMl in iMlwardvs's Wosciipt it»n, but piMliaps 

 iiuliciUtMl ill tlio ti.uiirc bv tli(> roil spots. 'riuMc :irr llin'c on lli(> in«Mli;iii 

 lino. In tlio yoiiii;; tlicsi* tiibcrcli's nic iiiorc proniiiu'iil ;iiiil llic I;ittM';il 

 ;iihI iii(M;i1 spiiu>s iuc proporlioiiMlly mucli Ioii^m' tli:in in iubills. 



Milno iMlwanls says of pnidUclitiuilii tlial I lie simoikI aiiibnlaldry loji' 

 is loiimM' than tlic liist. In this stMics of spcciiinMis tlic two Icjis arc 

 vory noaily v'tpial in Kmi^iIk soiiu'liiiM's (he lirsl bciiij; a little loiiiicr 

 and soiiu'limos the stM'ond; this ditVerence may orcnr on (tpposite sid(>s 

 t)t tlu> same indix idiial. Th(> \ aria t ion is due to the tact that, all lion uli 

 the nieral joint is always Ioniser in tlit> seeond pair, the earpal and 

 teiininal joints are alwayvS lon.uer in the tirsi pair; (he prop(»dal joints 

 are more nearly equal, but when there is a dillereneis it is always lonj^tM' 

 in the tirst h\u. 



The eharaeters above nuMitioued, whieli are eonstanl in the hundred 

 spoeimens examined, taken in couiioction with the ,iiiea( ditVerenee in 

 habitat, art\ 1 think, siitlieient basis for the t'ormation of a species. 



I.eiiiith of carapace, (il; wid(h to base o\' spine. *.».""»; Icn^tli of spine, 

 1 I millimeters. 



('(•Ilectcd by the Allxitros^ Ai the Ibllowin^- stations oil the coast of 

 California : 



One half of the s]>ecimeiis colhM'ted arc yoiiniLr. k:^(atioii ."S-OT yielde»l 

 (lie iire;dest number. 



Family MHCl )Sll D.K. 



Subfamily li.iiN.i;. 



Ebalia ainciicana. 



Carapace lonucr than broad. sub(til)iciilar. con\'c\; a distinct uroove 

 separates tluMardiac. branchial, and intestinal regions; entire surface 

 fiiannlar, tlM> small ,uraiinles t'rowded together, (he lar^c oiu>s pronii- 

 milt, numerous, spiny; intestinal rei;ioii obli(pie, very much n)iiiided. 



