84 



observed. The last thoracic segment is obtusely triangular in outline, with the apex very narrowly 

 rounded. The rostrum is robust and strongly bifurcate. The rami are truncate at the apex and 

 bear a moderately long curved filament. 



The abdomen is composed of four segments. The combined length of the abdomen and 

 furca is contained about two and a half times in the total length of the cephalolhorax, from 

 the frontal margin to the base of the genital segment. The genital segment is rather shorter 

 than the combined length of the second and third segments. The anal segment is very small 

 and is equal to about one-third of the length of the third segment. The furcal joints are as 

 long as broad, and are equal to the length of the anal segment. 



The antennules are composed of twenty-four joints, and extend to the end of the second 

 abdominal segment. The basal joint of the antennules appears to be divided. 



The antennae, mandibles, maxillae and maxillipedes are similar in structure to those 

 of Cornucalanus chelifer. The curved spine on the apex of the first maxilliped, is furnished 

 with a frincre of short hairs on the middle of the internal and external marQÏns. The internal 

 base of the spine carries a short stout process, which is produced at the apex into a long 

 whip-like seta. The apex of the first maxilliped bears six short sensory organs with tufted heads, 

 and two long simple filaments. 



The four pairs of swimming feet are similar to those of Onchocalauus. 



The fifth pair of feet is very small. Each foot consists of two free joints attached to a 

 basal part. The first joint is furnished with a small tuft of spinules at its posterior end. The 

 second joint is furnished with three or four transverse rows of spinules. The joint terminates 

 in two small apical spines. 



No figures of Cormica lamis simplex have previously been given, but so far as Wolfendex's 

 very brief description goes, the 'Siboga' form appears to agree with that species. The 'Siboga' 

 specimen is an adult female, and by the absence of the cephalic spine is evidently distinct from 

 Cornucalanus chelifer. The remarkably strong and curved claw with the peculiar process at 

 the base, on the apex of the first pair of maxillipedes, is sufficiënt to separate this genus from 

 any of the other members of the family Phaennidae. 



Occurrence. — One female was obtained from the plankton collected with the Hensen 

 vertical net at Station 143, 1000 metres to the surface. 



Genus Amallophora T. Scott, 1893. 



This genus was established by my father in 1S93, for a Calanoid, which was readily 

 distinguished from any other known form by the presence of a peculiar appendage, resembling 

 a sheaf of corn, on the apex of the first pair of maxillipedes. Other forms were included in 

 the genus, but these are now clearly not congeneric. Aniallophora was afterwards included under 

 the genus Xanthocalanus by Giesbrecht and Schmeil. 



Saks has recently revived the genus for the reception of one of the species originally 

 included in it by my father. Farran rightly points out, however, that this use cannot be upheld, 

 as Amallophora inagna is not congeneric with Aniallophora typica. 



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