PLATE I. 



In all figures representing the male petasma or the distal half of its pars media the following lettering 

 is used. a. pars astringens; e. pars externa; lam. lamina externa of pars externa; pu. processus uncifer of 

 pars externa; m. pars media; pb. processus basalis; pv. processus ventralis; la. lobus armatus ; Ie. lobus 

 connectens; li. lobus inermis; //. lobus terminalis; lac. lobi accessorii. 



Fig. I. Ser gestes inous Faxon. 



Fig. i a. Left petasma, from behind ; X /■ 



Fig. 1 b. Distal portion of pars media of the same petasma, from behind; X 19. 



Fig. ir. Distal portion of pars media of the same petasma, from in front; X 19. 



Fig. 2. Ser gestes G ar diner i Kemp. 



Fig. 2a. Left petasma, from behind; 20. 



Fig. 2b. Distal portion of pars media of the same petasma, from behind ; X 40. 



Fig. 2c. Distal portion of pars media of the same petasma, from in front; X 40. 



Fig. 3. Sergestes bisitlcatus Wood-Mason. 



Fig. 3#. Front end of the carapace of a female, from the left side ; X 6. 



Fig. 3<5>. Left petasma, from behind; X 13- 



Fig. 2> c - Distal portion of pars media of the same petasma, from behind; X 30. 



Fig. T,d. Distal portion of pars media of the same petasma, from in front; X 30. 



Fig. 4. Sergestes Challengeri H. J. H. 



Fig. 4a. Front end of the carapace of a female, from the left side; X 13. 



Fig. 4b. Right eye-stalk with eye of a female from Stat. 46a, from above; X 23 / 2 - 



Fig. 4c Third joint of left antennular peduncle with the proximal parts of the two flagella of a male from 



Stat. 185, from the left side; X 15- 



Fig. \d. Third joint of left antennular peduncle of another male from Stat. 185, from the left side; X '^/^ 



Fig. 4e. Third joint of left antennular peduncle of a female, from the left side; X 2 %- 



Fig. 4/. Distal portion of pars media of left petasma of a male from Stat. 185, from behind; X 32. 



Fig. 4g. Same distal portion of pars media of left petasma, from in front; X 32. 



Fig. 4/1. Distal half of processus uncifer of the same petasma, from behind ; X 32. 



Fig. 41. Antenor part of a very young specimen, 13.3 long, from Stat. 143, from above; X 13. 



Fig. 4k. Exopod of left uropod of a Mastigopus, 12.3 mm. long, from the outer side; X 14. 



Fig. 4/. Anterior part of a Mastigopus, 12.3 mm. long, from Stat. 148, from the left side; X 13. a. rostrum; X 32. 



Fig. 5. Sergestes sp. 



Fig. 5«. Third joint of left antennular peduncle with the proximal parts of both flagella of an adult male 

 from Stat. 100, from the outer side; X 9- 



Fig. 6. Sergestes fulgens n. sp. 



Fig. 6a. Anterior part of the carapace with left eye and the basal parts of antennula and squama of a 



male, from the left side; X 6. 

 Fig. 6b. Third joint of left antennular peduncle with the lower flagellum and the proximal part of the 



upper flagellum of an adult male, from the left side ; X 9- 

 Fig. 6c. Proximal half (the clasping organ) of the lower flagellum of the same antennula, from the outer 



side; X 24. 

 Fig. 6d. Distal part of third maxilliped of a male; X 14. The terminal setae wanting. 

 Fig. 6e. Left petasma, from behind; X 12. 



Fig. 6/. Distal portion of pars media of the same petasma, from behind; X 22. 

 Fig. 6g. Same distal portion of pars media of left petasma, from in front; X 22. 



Fig. 7. Sergestes seminudus n. sp. 

 Fig. ja. Left petasma, from behind; X 16. 



Fig. jb. Distal half of pars media of the same petasma, from behind; X 31. 

 Fig. 7<\ Distal half of the same pars media of left petasma, from in front; X 31. 



