208 CALIFORNIA ACADEMY OF SCIENCES. 



Spirontocaris lamellicornis (Dana). 



Hippolyte lamellicornis DANA, Proc. Acad. Nat. Sci. Phila., 1852, p. 24; 

 Crust. U. S. Expl. Expd., Part 1, 1852, p. 567, PI. XXXVI, fig. 6. 

 STIMPSON, Journ. Boat. Soc. Nat. Hist., Vol. VI, 1857, p. 498. KINGS- 

 LEY, Bull. Essex Inst., Vol. X, 1878, p. 62. 



Spirontocaris lamellicornis WALKER, Trans. Liverpool Biol. Soc., Vol. XII, 

 1898, p. 277. 



"Beak long, broad, lamellate, produced nearly to posterior margin 

 of thorax, bifid at apex, undulate above, four spines upon cephalothorax 

 and about six upon proper beak, teeth or spines unequal, all nearly 

 equally spaced; outline of beak below triangulately salient, two-dentate. 

 Inner antennae little longer than the beak. Anterior feet very slender, 

 but little stouter than the next pair. Second pair hardly shorter than the 

 third, carpus elongate, seven-jointed, third joint quite long. Tarsi of 

 following pairs nearly unarmed, a few very minute spiuules towards the 

 base. Outer maxillipeds spinulous at apex, last joint pubescent above. 



"Length of body one and one-half to two inches. The four dorsal 

 spines are rather larger than those of the beak proper; and the first and 

 last of the latter (not counting the bifid tip), are much smaller than the 

 others; the outline of the whole is separately arcuate along the back and 

 along the beak, with a concave outline between the two parts. The naked 

 tarsus is peculiar. The base of the inner antennae is hardly as long as 

 half the beak, and the flagella scarcely reach beyond the tip of the beak. 

 The second and third joints of the abdomen have the lateral margin trian- 

 gulate or obtusely pointed, and in the next two this margin is acute. 

 The third joint of the carpus of the second pair of feet is twice as long 

 as the first and second joints together. The six posterior legs are nearly 

 naked. 



"Dungeness, in the Straits of De Fuca, Northwest 

 America." 



Species not seen. 



Family PANDALID^E. 



Rostrum long, slender and spiny. Eyes free. Mandibles with a two- 

 or three-jointed palp. First pair of pereopods simple; second pair chelate, 

 with the carpus annulated. 



