114i MR. T. SCOTT ON ENTOMOSTEACA 



Uahltat. Station 23 (lat. i^ 26' 7" S., long. 10 1' 8" E.), 30 fathoms, in a tow-net 

 slathering collected between 11 a.m. and 3 p.m. A few specimens (male and female) 

 were observed ; they were readily distinguished by being larger and much broader in 

 proportion to the length than the others. 



? COPILIA DENTICULATA, Claus. 



1863. Copilia denticulata, Claus, Die freilebenden Copepodcn, p. 161, pi. xxv. figs. 14-20. 

 One or two specimens ( 2 ) of a Copilia apparently belonging to this species occurred 

 in a few of the tow-net gatherings along with Copilia mirabilis. 



Copilia Pultoni, n. sp. (PI. XI. figs. 15-50 ; PL XII. figs. 1-3.) 

 Length, including caudal stylets, 5"3 mm. {\j of an inch), the length of the caudal 

 stylets is about 1"6 mm. The first cephalothoracic segment is equal to about four-tenths 

 of tlie entire length of the animal, including the stylets. Anterior antennae as in Copilia 

 mirabilis, Dana, 6-jointed, the proportional lengths of the joints as in the formula : — 



40 . 35^ 17^5^. 17_^ 

 1 2 "~3 ^ 5 W 



Posterior antennse and mandibles also nearly as in Copilia mirabilis, except that the 

 third joint of the posterior antennse is scarcely two-thirds the length of the preceding 

 joint, and tlie marginal spine of the second joint is much smaller than that on the intero- 

 distal angle of the first joint (PI. XL figs. 47-48). The maxillfe consist each of a single 

 broadly spatulate joint bearing three apical spines (PI. XL fig. 49). Anterior foot- 

 jaws stout, 1-joiuted, and provided with two terminal spines and two lateral spiniform 

 seta3 (PL XL fig, 50). Posterior foot-jaws 2-jointed and armed with a stout, nearly 

 straight claw (PL XII. fig. 1). SAvimming-feet as in Copilia mirabilis. Fifth pair rudi- 

 mentary, each consisting of one small joint provided with a terminal spine and two small 

 setae. The abdomen is 4-jointed and is about equal to the combined length of the 

 last three thoracic segments ; the postero-distal angles of the first a1)dominal segment 

 each bear two small spiniform seta?, and the last joint is about equal to the combined 

 length of the two preceding joints. The second last thoracic segment only is produced 

 into a median dorsal spine. 



Habitat. Station 23, in a tow-net gathering from 30 fathoms, collected February 5th. 

 Only three specimens were obtained. 



The comparatively short posterior abdominal segment distinguishes this species at a 

 glance from Copilia mirabilis, Dana. It differs from Cojjilia Briicll, I. C. Thompson, 

 by the evenly rounded outline of the first body-segment, in the proportional length of 

 the joints of the posterior antenna;, in the second last thoracic segment being produced 

 into a median dorsal spine, and in the presence of a fifth pair of feet, besides one or two 

 other points shown by the drawings. 



In the Report on the ' Challenger ' Copepoda the abdomen of Copilia is, in the 



