14 BULLETIN 54, UNITP:D STATES NATIONAL MUSEUM. 



few stout spines, some bifid, otliers serrulate. Onl}^ the anterior 

 three segments of the pleon bear limbs (pleopods). Each of these 

 consists of a flat basal piece (protopodite), to which are attached two 

 one-jointed blades, furnished on their oiiter edges with long pinnate 

 setsB, the exopodite bearing about 35, the endopodite about 15. Both 

 protopodite and endopodite bear a single stout seta on their inner edge. 



"The last segment bears a pair of four-jointed setose limbs (uro- 

 pods), the segments of which are cylindrical and increase in length 

 from base to tip. The marsupia of the female are thin-walled pouches 

 attached to the ventral wall of the sixth thoracic segment (fourth free 

 segment). They increase in size with the development of the eggs 

 and in some specimens extend over segments five to seven, to which, 

 however, they are not attached. 



"The largest specimens collected measure from rostrum to tip of 

 pleon 4.7 mm. and in width 1,4 mm. The ground color in alcoholic 

 specimens is pale yellow. Upon the carapace this is heavily mottled 

 with brownish pigment, excepting over about thirty elliptical and 

 subelliptical areohe symmetrically arranged toward the middle line. 

 The dorsal surfaces of the chela; are similarly marked. The portion 

 of the body and the limbs behind the carapace are much paler, being 

 usually concealed in the tubular dwelling. "^ — Moore. ^' 



The type specimens of this species were sent me from the University 

 of Pennsylvania. As the bottle in which they were placed had been 

 accidentally broken and the specimens allowed to dry up, they were 

 not in a condition to redescribe, so 1 have quoted Doctor Moore's 

 description, which is very full and accurate. 



TANAIS NORMANI Richardson. 



Tanais normani Richardson, Proc. U. S. Nat. Mus., XXVIII, 1905, pp. 369-370. 



Locality. — Monterey Ba}', California. 



Body narrow, elongate, 4 mm. long. : f mm. wide. 



Head as wide as long, with the anterior margin triangulate between 

 the eyes, which are situated at the extreme antero-lateral angles. 

 The head is half as Avide anteriorly as it is posteriorly. The e3^es are 

 small, but distinct. The first pair of antennm are composed of three 

 articles, and have the first article longest, about two and a half times 

 as long as wide; the second article is half as long as the first; the third 

 is a little shorter than the second, and terminates in a bunch of long* 

 hairs. The second pair of antennge are composed of five articles and 

 have the first article about three times as long as the second; the third 

 is twice as long as the second; the fourth is one and a half times 

 longer than the second; the fifth article is minute and terminates in a 

 bunch of hairs. 



«Proc. Acad. Nat. Sci. Phila., 1894, pp. 90-94. 



