600 PROCEEDINGS OF THE NATIONAL MUSEUM. vul. 47. 



3. A distinct dorsal carapace; second and third thorax segments more or less differ- 

 entiated; no genital process nor anal laminae; two posterior processes ventral to 

 the egg strings; male type B, pi. 25 Lernaeopoda Blainville, 1822, p. 631. 



3. A distinct dorsal carapace; trunk unsegmented; no genital process nor anal 



laminae; two posterior processes dorsal to the egg strings; male type D, pi. 25. 



Lernaeopodina, new genus, p. 639. 



4. Fused head and trunk covered mth longitudinal rows of knobs or tubercles; male 



unknown Basanislcs Nordmann, 1832, p. 643. 



4. Fused head and trunk smooth, without tubercles or knobs; male type N, pi. 28. 



Vanbenedenia Malm, 1860, p. 644. 



5. Cephalothorax distinctly separated from the trunk; second maxillae united at the 



tip and furnished with a bulla; male unknown. 



Tracheliastes Nordmann, 1832, p. 644. 



6. Second maxillae shorter than the cephalothorax, three-quarters fused and with 



branching horns instead of a bulla; mouth tube depressed; male unknown. 



Brianella, new genus, p. 647. 



6. Second maxillae twice as long as the cephalothorax, entirely separate and with an 



ordinary bulla; mouth tube projecting prominently; male unknown. 



Thomsonella, new genus, p. 649. 



7. Trunk, or second maxillae, or both, with deeply incised, fimbriate processes; 



cephalothorax in line with the trunk 8. 



7. No fimbriate processes on either the trunk or the second maxillae; cephalothorax 



inclined to the trunk 9. 



8. Cephalothorax short, thickset, and straight; anterior fimbriate processes on the 



second maxillae; posterior ones on the posterior margin of the trunk; male 

 type C, pi. 26 Thysanote Kr0yer, 1863, p. 650. 



8. Cephalothorax long, slender, and curved; both sets of processes entirely separate 



from the second maxillae and the posterior margin; male type H, pi. 26. 



Thysanotella, new genus, p. 651. 



9. Cephalothorax short and stout, in line with the trunk, the two separated by a 



distinct and very narrow neck; second maxillae entirely fused, with a bulla; 

 no genital process, anal laminae, or posterior processes; male unknown. 



Cauloxenus Cope, 1872, p. 665. 



9. Cephalothorax short and stout, flexed backward; second maxillae entirely sepa- 

 rate, each ending in a clasping enlargement; no bulla, genital process, or anal 

 laminae; two small posterior processes, dorsal; male type I, pi. 26. 



Charopinus Kr0yer, 1863, p. 652. 



9. Cephalothorax elongate and wormlike, curved or flexed at an angle with the 

 trunk; second maxillae in the form of broad clasping muscle bands; no bulla, 

 genital process, or posterior processes, but an unsegmented abdomen with anal 

 laminae ; male type J, pi. 27 Naohranchia Hesse, 1863, p. 657. 



9. Cephalothorax elongate and wormlike, flexed at an angle with the trunk; second 



maxillae normal and furnished with a bulla 10. 



10. Second maxillae short and completely fused, often entirely lacking; a genital 

 process, but no abdomen or anal laminae, and usually no posterior processes. 11. 



10. Second maxillae long and separate to their tips; a genital process and from two to 



six posterior processes, but no abdomen or anal laminae 12. 



11. Second antennae uniramose, tiu-ned down across the frontal margin; first maxillae 



bipartite; first antennae three-jointed; male type M, pi. 27. 



Clavella Oken, 1815, p. 666. 



11. Second antennae biramose, turned down across the frontal margin, ventral ramus 



two-jointed; posterior processes sometimes present; first maxillae bipartite; first 



antennae four-jointed; male type, K, pi. 27 Clavellopsis, new genus, p. 686. 



