578 PROCEElUXaS of TIIIC national musk I'M. 



tooth, curved inward and upward and with crenulated outer margin; 

 a short, bhmt tooth at tlio base ol" the second joint; a tooth on the 

 outer margin, forming i)ait of the wall of the orbit, iind two laminate 

 teeth between tlio outer sinus and the buccal cavity. 



(!helii»e(l8 one and one-third times the length of the carapace in the 

 nnile. Upi)er surface of the merus and cari)ns with sonu' scattered 

 tubercles; outer surface of merns with a longitudinal row; also two or 

 three tubercles at the proximal end of the outer lower margin. I'alm 

 long and narrow, nuirgins i)urallel, sui)erior length twice the width 

 and more than one and a half times the length of the dactylus. Pollex 

 not bowed downward as in .1/. pUdysoma Stimpson. The chelipeds of 

 theleniale dilfer in being juorc slender and about nine-tenths the length 

 of the carapace. First pair of ambulatory legs reaching half the length 

 of the i)alm of the chelipeds in the male and equaling the chelipeds in 

 the ^cmah^. Merai Joints of ambulatory legs armed with spines and 

 tubercles on the superior and outer or i)osterior surfa(;es; carpal joints 

 with two or three si)ines; margins hairy. 



Dimensions. — Male: Length, 15.;} mm.; width, including spines, 

 14 mm.; oxchuling spines, ll.Snnn. Female: Length, 15 mm.; width, 

 including spines, 14 mm.; excluding spines, 11.5 mm. 



Typcu. — No. 2157(», IT.S.N.M. One male, two females, Magdalena 

 l>ay. Lower ( 'alifornia, VI fathoms, station liS,'U. 



Additional localities. — Oil' Abreojos Point, Lower Oalifornia, 48 

 fathoms, station li834: Gulf of California, northwest of Guaymas, 22 

 i'athoms, station 3012. 



39. MICROPHRYS TRIANGULATUS (Lockington). 



AUfhr((cnlitf< lri(iti()iiUiliin Lockinuion, I'ror. Ciil. Acad. Sfi., .)nly 17, 187(i, 1K77, 



VI I, p. 7:5. 

 Milhra.i- Iridiniiilii^as Kinc;si,ky, I'loc. liostoii Soc. Nat. Hist., 1879, XX, p. Mi). 



Southern i)art of the (Julf of Oalifornia, 7 to 10 fathoms, stations 

 2824 to 2S2S, inclusive. 



This species, according to the structure of the orbits and antenna^, is 

 a Mlerophri/s. The shape and i)i'otuberances of the carapace arc also 

 similar to species of that genus. The rostrum is short, as in many 

 species of Mithra.i-. , 



40. PITHO QUINQUEDENTATA Bell. 

 niho iiiiiiKiiicdoilala l?i<:i.r,, rioc. Zool. Soc riOudon, 1S;)5, III, p. 172. 



Southern part of Oulf of Oalifornia, 10 fathoms, station 2828. 



41. PITHO LHERMINIERI (Schramm). 



Olhoiiiti llicrmiuieri Sc^uKAiMM, Crust. («iiad('lou])o, 1S67, p. 20. 

 ruho Iheriiiinicri Kaiubun, Aim. lust. .laniaicu, 1897, 1,]). 8. 



Oir Cape St. Iloque, lira/il, 20 fathoms, station 2758. 



