284 MB. G. p. FARBAN ON COPEPODA 



tlie view in Dana's figures, which, apparently, include two 

 different species. 



Wolfenden (11) also believes that he has recognised the 

 C. 2}6ttit'Cidus of Dana, but his figures and descriptions refer 

 undoubtedly to the species which Giesbrecht has described as 

 C. gibhidus. 



Dahl, in the paper referred to above (5), which is a prelimi- 

 nary note on the Oopepoda of the Plankton Expedition, has 

 drawn up a useful diagnostic table of the members of the genus 

 C'oryccBus as recognised by. him. The poi-tion which refers to the 

 genus Gorycella has been translated by Dr. Wolfenden (11) in his 

 account of the Maldive Oopepoda. In this table Dahl gives as 

 a mark to distinguish the other members from C. rostrattis, 

 "Yiertes Beinpaar mit einem inneren Za pf en welch er eine Borste 

 triigt." If by " Zapf en " is meant endopodite, as is undoubtedly 

 the case in the latter part of the table, and as Wolfenden trans- 

 lates it, this statement is an error, as the endopodite is absent 

 throughout the group. There is a misti-anslation in Wolfenden's 

 table which detracts somewhat from its usefulness ; the sentence 

 " Genital openings of $ set at end of abdomen " should read 

 " distant from end of abdomen," " vom Ende des Abdomens 

 entfernt." 



The specific characters in the genus Gorycella are very slight 

 and depend mainly on the shape of the abdomen and the third 

 thoracic segment. The following is an attempt to draw up 

 a diagnostic table, to include the females of which a recognisable 

 description exists and two new species from the Christmas 

 Island collection, which are describee! below. 



1. Furca only twice as long as broad C. rostrata. 



2. Fnvca three or more times as long as broad. 



A . Furca shorter than widest part of abdomen in dorsal view. 

 a. Widest part of abdomen behind the middle, 3rd thoracic 



segment with dorsal hvimp. 

 a. Abdomen less than twice as long as high in lateral 



view, median furcal spine short and stout C. f/ilihila. 



/3. Abdomen ca. 2f times as long as high in lateral view, 



median furcal spine slender C. Irevig, sp. n. 



h. Widest part of abdomen in front of middle, 3rd thoracic 

 segment not humped dorsallj'. 

 a. Thoracic spines long, abdomen with ventral setose 



pad C. ca rinata . 



13. Thoracic spines short, abdomen without setose pad ... C. citrta, sp. n. 



B. Furca longer than widest part of abdomen. 



a. Furca less than half as long as abdomen, 3rd thoracic 



segment with dorsal hump C. Inngicmidis. 



b. Furca less than half as long as abdomen, 3rd thoracic 



segment without dorsal hump C. concinna. 



CoRYCELLA GiBBULA Giesbr. 



Coryccmis gihhidus Giesbrecht (10). 



Corycmus pellucidus Wolfenden (11). 



? Corycceus onegalops Will.-Suhm (1). 

 Common in all the gatherings, upwards of 120 specimens. 

 The most easily recognised characters of the female of this 



