﻿COPKPODA 



109 



Description, f?. Size of speciiiieii fnmi Thor vSl. 1S3 was 5-1 nun.; anterior division 4 nnn.; 

 nrosome I'l nnn. Sars' specimens measured 4-85 mm., Farran's specimens 5-1, .Scott's 54 and 

 Wo If en den's 37 — 4 ram. 



The frontal spine, which has a triani;nlar base, lias as seen in fi<j. 5 a the tip directed forwards 

 and upwards. The distance between the base of the frontal spine and the frontal organ.s, which are 

 placed on a small j^rocess, is almost straight with a low crest. The rostrum is terminally bifurcate. 

 The shape of the body is scarcely different from Farran's figure; the anterior division is 2-5 as long 

 as wide and 3-6 as long as the urosome. The genital somite (fig. 5 b), which is distinctly 1-4 as wide 

 as long and i-i as deep as long, has a fairly prominent receptaculum semiuis. The relative length of 

 the abdominal somites and the furcal rami is the following: 42, 23, 19, 18 and 21; the fnrcal rami are 

 I'l as long as wide. 



The (intiiiiiac. which have the Re about 1-3 as long as the Ri, ha\e the Ri I almost twice as 

 long as Re II, which is 17 as long as Re I, and a little shorter than Re \'II. The Re I has a single 

 terminal seta on a conical protuberance, and the Re II 

 has 3 setae, of which the basal is the longest and 

 like the median one is placed on small protuberances. 

 The inaxiUulac possess 5 setae on Li II; the Li I has 

 no spinules posteriorly and the Li III has none ante- 

 riorl}-. The third basipodite of the iiia.xillipt'ds is 3 

 times as long as the eudoijodite and i'3 as long as 

 the first and second basipodites combined ; the lamina 

 of the second basipodite (text-fig. 26 b), which is folded 

 in a characteristic way, is in the whole length faste- 

 ned to the anterior surface of the segment; the inner 

 margin of the third ba,sipodite is basally not straight 

 as shown in Farran's figure, but slightly convex as 

 figured by Scott. 



The first pair of legs has a well developed 

 articulation between Re I and II, and the Se of Re II 

 almost reaches the end of Re II. The second pair of 

 legs has a well developed articulation between Re I and II, and a glandular pore at the base of Se 

 Re I; the tern:inal seta, which has 23 teeth, is a little longer than the Re III, and of equal length 

 to Re I— IL 



The second basipodite in the fourth pair of legs has about 25 knife-shaped spines as shown 

 in fig. 5 c. 



The oral surface of the labrniii is fairly characteristic, as shown in fig. 5 d, especially the trans- 

 verse rows of granules arouiul the median circular sjjot Nr. 4; the lamina labialis has a characteristic 

 granulation as seen in fig. 5 e, which also illustrates the area in front of it. The arrangement of setae 

 ill the lateral series behind the lamina labialis is not unlike that of G. pilcatus: Ser. set i consists 

 of about 70 short setae placed in a longitudinal grouij: The series 2 seems to be rcpresenteil by 3 



Text-fig. 27. Uaftanus latifrons G. O. Sars. 

 a. f9. MaxiUa sin in post, view X 57- •>■ f?- JIaxillipcs 

 sill, in ant. vnew X 57- c. Y vstage IllJ. Maxilla (k-xt. in 

 ant. view X 57- d. Y (stage III. Maxillipcs sin. in an- 

 terior view X 57- e. YcJ (stage V . Pes V in anterior 

 view >, 57. 



