OSCAR SUND 



[REP. OF THE "MICHAEL SARS" NORTH 



Review 



of the species of Sergestes. 



Names of species treated in this paper are printed in heavy type. 



A. First joint of antennular peduncles much longer than third. 



I. Two outer joints of antennular peduncles robust, nearly as broad 

 as first 



1. Cornea small, not broader than stalk, integument soft 



2. Cornea larger than stalk, skin hard as in prawns, 

 a. No ocular spot or tubercle 



«. No luminous organs (?) 



B. 



S. mollis Smith . 

 S. inous Faxon . . . 

 S. japonicus Bate. 

 S. profundus Bate 



S. bisulcatus W. Mason 

 5. bisulcatus Stebbing . 

 5. prehensllis Bate 



/?. Luminous organs present 



+ On scaphocerite and uropods only 

 + + Also on other parts 



b. Ocular spot present 



c. Ocular tubercle present. 



S. robustus Smith . . 

 5. grandis n. sp. ... 



S. Challenged, H. J. H. 

 S. gloriosus Stebbing . 

 S. splendens n. sp. . 

 5. Gardlneri Kemp, . . . 



5. Kroyeri Bate 



S, phorcus Faxon .... 

 S. tropicus n. sp. . . . 



II. Two outer joints of antennular peduncles slender much narrower 

 than the first 



1. Body very slender, cephalic portion very long 



2. Body not so slender, no abnormal distance between mouth 

 and eyes: 



a. Hairfringe on more than half the length of outer uropod 



b. Hairfringe on less than half the length 



First joint of antennular peduncle shorter than third or of same 

 length. 



I. Mxp. 3 not thicker and longer than trl. 3 Outer edge of outer 

 uropods fringed with setae for less than half their extent, the 

 hairfringe limited proximally by a tooth. 



1. No spine on epimeron of 5th abd. segment 



2. Curved spine present on 5th abd. epimeron 



II. Mxp. 3 more robust than trl. 3 Tooth on outer uropods generally 



absent. 



1. 6th joint of mxp. 3 divided into 6 subjoints 



2. 6th joint of mxp. 3 div. into 5 subjoints. Mxp. 3 with "comb- 

 -like" row of short spines 



3. 6th joint of mxp. 3 divided into 4 subjoints. 



a. Hairfringe on less than half the length of outer uropod. 



b. Hairfringe on more „ — „ — — „ — — „ — 



a. 20 — 25 spines on 6th joint of mxp. 3 



ft. 13-15 „ - 6th „ - „ 



I- 3rd joint of antennular peduncle as long as the 1st 



+ + 3rd joint of antennular peduncle Va longer than 



the 1st 



S. tenuiremis Kr. 



S. arcticus Kr 



S. slmilis H. J. H 



S. Henseni (Ortm.) H. J. 



H. 



A. 

 P. 

 P. 

 P. 



I. 



A. 

 P. 



NAM. 



A. 



P. 



A. 



A. 



I. 



P. 



P. 



A. 



A.P.I. 



N.A.M. 



P. 



A. 



5. atlanticus H. M. Edw 



S. cornutus Kr 



M.A.I.P 

 A. 



f 5. corniculum (Kr.) 



S. Edwardsi Kr 



S. rubroguttatus Wood Mason l ) 



M.A.I.P 



A. 



I. 





A. 



S. incertus H. J. H 



A. 



S. vigil ax Stimpson 



A. 



S. dlapontius Bate, H. J. H 



A. 





A. 



l ) The structure of the mxp, r; not known to me, but probably like that of 5. corniculum. 



