CRUSTACEA COLLECTED IX PUGET SOUND, N.A. 277 



Spirontocaris lamellicornis (Dana). 



Eight specimens. Length 40 mm. 



Very variable in the number and form of the teeth of 

 the rostrum and dorsal carina, but the latter always 

 begins at the hinder margin of the carapace instead of 

 before the middle (" antice ultra medium") as in Hippo- 

 lyte ochotensis, Brandt. From S. spinus (Sowerby) it 

 differs in having two post-ocular spines instead of one. 



Spirontocaris prionota (Stimpson, Proc. Acad. Xat. Sci., 

 Phil., 1864, p. 153). 



Six specimens. Length 35 mm. 



Easily distinguished by the serrate margin of the dorsal 

 teeth 



Spirontocaris cristata (Stimpson, 1. c, 1860, p. 33). 

 Four specimens. Length 18 mm. 



Spirontocaris herdmani, n. sp. PI. XVI., fig. 2. 



One female with ova. Length 30 mm. 



Carapace smooth ; a strong tooth below the eye and a 

 small one at the lower anterior angle ; no post-ocular 

 spine. Dorsal carina beginning rather in front of the 

 middle ; rostrum horizontal with sub-parallel margins 

 reaching a little beyond the end of the peduncle of the 

 inner antennae ; upper margin with five teeth, of which 

 two are on the thorax, the 2nd, 3rd, and 4th close together, 

 the distance from the 5th to the point equal to the length 

 from the 2nd to the 4th. Lower margin with one tooth 

 near the point. 



Inner antennce with a spine on each joint of the 

 peduncle. 



Outer anteniue. Scale broad at the base, narrowing 

 distally, with a strong spine, half as long again as the 

 sub-equal antennal and antennular peduncles. 



