U.S. NATI 
ONAL MUSEUM BULLETIN 100, VOL. 14, PART 4 PLATE 18 
' SPECIES OF SCAPHOCALANUS, SCOLECITHRICELLA, TORTANUS, AND EUCHAETA. 
227-229, Scaphocalanus robustus (T. Scott), female: 227, Dorsal view; 228, lateral view; 
229, third leg.® 
230-232, Scolecithricella dentata (Giesbrecht): 230, Lateral view, male (fifth legs ampu- 
tated); 231, fifth legs, female; 232, fifth legs, male. 
233, 234, Scolecithricella vittata (Giesbrecht), female: 233, Dorsal view; 234, fifth leg. 
235, 237-241, Tortanus murrayi A. Scott, female: 235, Dorsal view; 237, second antenna; 
238, mandible; 239, first maxilla; 240. second maxilla; 241, fifth legs. 
236, 242, Tortanus murrayt A. Scott, male: 236, Dorsal view; 242, fifth legs. 
243, 244, Euchaeta spinosa Giesbrecht: 243, Urosome, lateral view, female; 244 distal, 
portion of left fifth leg, male. 
