42 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 85 



Plate 15 



PAGE 



Naraoia spinifer, new species 15 



Fig. I. (X2.) Posterior dorsal shield with traces of segmented body 

 and thoracic limbs ; a dorsal view of another specimen shows 

 clearly defined exopodites with the slender, distal ends of 

 endopodites projecting from beneath them. 



Naraoia compacta Walcott 10 



Fig. 2. (X2.) Smaller, retouched picture of the specimen shown in 

 fig. 4, pi. 13. 

 3- (X I-5-) Incomplete individual clearly showing the axis. 



Biirgessia bella Walcott 15 



Fig. 4. (X3.) Specimen showing the outlines of 10 thoracic legs 

 formed of the six joints of the endopodite and the large 

 protopodite, also the annulated intestine and fragments of the 

 crushed carapace. 



5. (X 4-) A dorsal view of a specimen in which the stomach and 



portion of the intestine as well as the large hepatic tubes are 

 distended so as to be moderately convex. The specimen also 

 shows the position of the antennae and portions of the hepatic 

 caeca. 



6. (X4-) A macerated specimen indicating the position of the 



eyes, the antennae, a portion of the labrum, the mandibles, 

 the maxillulae, and the maxillae ; also the proximal portion 

 of seven pairs of the thoracic limbs, with a fair indication of 

 the point of attachment of the limbs to the body. 

 "• (X3-) Another very fine individual. 



Plate 16 



PAGE 



Biirgessia bella Walcott 13 



Fig. I. (X2.) Fragmentary specimen indicating structure of limbs. 

 (Possibly oriented incorrectly.) 



2. (X 4-) A specimen preserving 10 pairs of thoracic limbs, show- 



ing their approximate place of attachment to the body, and 

 also their expanded joints and general form. 



The carapace has been crowded back and crushed, but the 

 antennae project from its anterior side in an almost natural 

 position. 



3. (X2.) A badly decayed specimen that shows the manner of 



attachment of the limbs. 



4. (X4-) Dorsal view of a specimen with the digestive organs 



beautifully preserved. These include the intestine posterior to 

 the large hepatic tubes, the stomach anterior to the latter, 

 and also the anterior and posterior branches of the main 

 hepatic tubes and the numerous finer hepatic caeca, which 

 occur on both the outer and inner sides of the main branches. 

 This specimen gives most of the data for tlie restoration 

 of the digestive organs as shown by text fig. 3. 



