VOL. XVI.T 

 ]89;f. J 



I'KOCEEDIJSGS OF THE NAI'IONAE MUSEUM. 



255 



with a rncdiiiii tubeicJc poiiiliii.u ])a(;kwai(l; on the posterior nunj^iii 

 are two tri;iii<iiihii' ohliise, liiiiiiniforni spines, the spaee between con- 

 cave; on the posterior part of the bran(;liial region, Jnst above the iniir 

 gin, there is ;i stout, somewhat tlattened, recurved si»ine, Frontal re 

 gion witliout hirge granules; theie is a cluster of granules at the sum 

 mit of the hepatie region, llostium uptiiriu^.d, truncate. Male abdo 

 men with third, fourth, and tilth segnuuits coalesced, hist segment 

 long, triangular; female abdiMiien with fourth, tifth, and sixth seg 

 ments coalesced, oval; abdomen and sternum in both .sexes granulate. 

 Orbits almost cirrular, with two fissures above and <me below, besides 

 the innc)' hiatus which is nearly tilled by the oblicpiely placed basal 

 anteniuil joint, Antennular fossa' obli(|U(\ Is(;hium of external max- 

 illi]>eds with a longitudinal row of large granuh^s; exognath with large 

 scattered gianules, wide at the base;, outer margin nearly straight, ex- 

 tremity rounded. There is a tubercle on the subhei>ati(5 r<'gion. ( Mieli- 

 l»eds in male abonttwo and a half, in female alxnit one and a half 

 times the length of the carai)ace; merns subcyliudrical with spiuy 

 granules; carpus and haiul with tiattened granules; hand compressed, 

 fingers about two thirds the length of the palm, not gaping, with gran- 

 ulate ridges, inner edges linely toothed and haiiy. Ambulatory legs 

 slender, grainilale; nu'ial Joints cylindrical, of fourth pair with a row 

 of si)iny grannies below; last three Joints tiattened; dactyls hairy. 



Length, withont posterior s]>ines, 12.5; width, 11; length of cheliped, 

 about .'{() millimeters. 



Gulfof ( 'alifornia; (J, S. Fish (Commission steamer Alhatros.s, 1SS8-'.S9: 



2822 



282:i 



.ion 

 :iOJt 



3037 



r.oUoin. 



KV. S.l.rk. Sh.... 



brk. Sli 



riK^KV-SI'ikSli 



K.V.S' 



«n. M 



iitiiro. 



57.9 

 02. 

 65. 2 



Cat. No, 



17386 

 17627 

 17387 

 17388 

 17389 



Myra townsendi. 



Carapace oval-orbicular, granulate, the granules not close together, 

 and on the gastric region few and indistinct; margin slightly concave 

 behind the hepatic; I'cgion; up|)er posterior spine at a, right angle with 

 the other two, longest; all three spines recurved; ptcrygoslomian re- 

 gions produced in a stout spine; frontal not(;h widely but distinctly 

 V-shaped. Male abdomen with the third to tlu^ sixth segments anchy- 

 losed; first three segments granulates, remainder smooth; sternum 

 granulate. In young males the abdomen is granulate for almost its 

 entire length. Female abdomen with the fourth to the sixth segnients 

 anehylosed and oval; the first three segments and the margins of the 

 anchyloscd segment granulate. Anterior margin of buccal cavity with 



