

778 CRUSTACEA. 



Body smooth. Abdomen with two obsolete prominences above, caudal 

 segment short, very broadly rounded behind. Caudal stylets reach- 

 ing just to line of extremity of abdomen; inner lamella arcuate on 

 outer side, subacute at apex ; outer, straight lanceolate, rounded at 

 apex. 



Plate 52, fig. 3 a, animal, enlarged six diameters ; b, under view of 

 abdomen, in outline ; c, antenna of first pair. 



Valparaiso, Chili. 



Length of body, two lines. The prominences on the last abdominal 

 segment are barely apparent, and have the same position as those in 

 the arrnata* 



Spheroma oregonensis. 



Corpus Iceve. Segmentum caudate breve, posticd latissimb rotundatum, 

 supra lawe. Styli caudales abdomen non superantes, lamella, intemd 

 multo longiore quam externa, fere obtusd, externa obtusd. Flagella 

 antennarum \rnarum 2darumque 12-14:-articulata. 



Body smooth. Caudal segment short, very broadly rounded behind, 

 smooth above. Caudal stylets not reaching beyond line of extre- 

 mity of abdomen; inner lamella much the longer, nearly obtuse; 

 outer obtuse. Flagella of antennae of both pairs twelve to fourteen- 

 jointed. 



Plate 52, fig. 4a, animal, enlarged three diameters; b, part of 

 antennas of second pair; c, under view of extremity of abdomen, 

 showing caudal appendages. 



Puget's Sound, Oregon; also, Bay of San Francisco, California. 

 Collected by Dr. C. Pickering. 



Length of body, four and a half lines. This species is near the 

 chilensis; but the lamellae of the caudal appendages are much more 

 unequal, the flagellum of the first antennae has many more joints, and 

 the abdomen is more broadly rounded behind. 



