426 PROCEEDINGS OF THE MTlONAL MUSEUM. voi - 



B 6. Anterior antennae six- or seven-segmented. Free swimming in plankton, or in 



the branchial Bacs of Ascidians Lichomolgus. 



Anterior antennae three-segmented. < >therwiseas Lichomolgus. Washings from 



dredgings, Indian < >cean Paralichomolgus. 



B 7. Inner ramus of fir.-t Leg three segmented : B 8. 



Inner ramus of firsl leg two-segmented B LO. 



B8 Firsl antenna not more than five-segmented. Fifth legs two-branched, folia- 



ceous. One egg sac. Males unknown. Moderate depths Heteropsyllus. 



First antenna more than five-segmented, seven-to nine-segmented B 9. 



B 9. Caudal ramilongand narrow, discontiguous. Firsl antenna seven-segmented. 

 Fifth legs two-segmented, the basal segmenl scarcely wider than the terminal 

 one. Inner rami of second, third, and fourth legs two-segmented, more or 



less modified. One hundred fathoms or more Cervinia. 



Caudal rami short and broad. First antenna nine-segmented. Tidal pools 



amongsl algae Paratachidius. 



B lit. Rostrum anchor-shaped, of three strong spines, the two outer ones slightly 

 curved outward at end. Towings, Pugel Sound.. Pseudolichomolgus (male). 



Rostrum nol anchor-shaped or of three spines B II. 



B M. Fifth legs one-segmented, sometimes plate-like B 12. 



Fifth legs two-segmented B 18. 



B L2. Fifth legs forming enormous concave plates which serve for holding ova. 



Male unknown. Muddy bottom, 10 to 30 fathoms Phyllopodopsyllus. 



Fifth legs normal, nol used for holding ova 1! L3. 



B L3. Basal segmenl of all the legs, elbow-like. Fifth legs long and narrow. Littoral, 



10 to 30 fathoms Laojihonlodcs i malei. 



Masai segment of all the legs, not elbow-like, normal B 14. 



B II. Furcal rami long and narrow, strongly divergent. Fifth leg plate-like. Two 



egg sacs. Male unknown. 50 fathoms, muddy bottom Stenheliopsis. 



Furcal rami, normal, fifth legs variously shaped I! L5. 



B I"). Anterior antennae five-segmented B Hi. 



Anterior antennae seven- to eight-segmented B 17. 



B L6. Body almost exactly cylindrical, about eleven times as long as wide. Anterior 

 and posterior maxillipeds claw-like. (Parasitic?. Fifth leg narrow. Littoral. 



Muddy bottoms, r> to 1.". fathoms Cylindropsyllus. 



Body suhcylindrical, aboul seven times as long as wide. Fifth leg broad. 



Littoral. L0to30 fathoms Enhydrosoma (male 



B 17. Fifth leg plate-like and two-lobed. Inner rami of third legs modified. Oyster 



washings, Indian Ocean'. Ceylonia (male 



Fifth leg much longer than wide. Second maxilliped forming a prehensile 



clawed hand, littoral, muddy bottoms Teiragonicepa 'female. 



B 18. Outer rami of firsl legs two-segmented B 19. 



( >uter rami of firsl It ;mented B 20. 



I; hi. Firsl legs prehensile. Body depressed. Caudal rami lamellar, apical setae rudi- 

 mentary. Inner ramus of third leg transformed in male. Littoral. .Asellopsis. 

 Ii: I legs Mot prehensile. I '.ody suhcylindrical. Caudal rami not lamellar. 

 Inner ramus of third leg transformed in male. Fresh water. One egg Bac, 



Mara nbiotus. 



B 20. Firsl lege prehensile B 21. 



Firsl legs nol prehensile B 25, 



B 21 . Basal segmenl of inner ramus of first leg with no seta on its inner ma ruin. R 



tral plate qo1 well defined at base I! 22. 



Basal segment of inner ramus of firsl leg with a seta. Rostral plate well 



defined at base Inner rami of first leg alwavs two-segmented . O 'gg 



sa< " .B 23. 



