FROM THE GULF OF GUINEA. 37 



its upper distal angle ; tlie next three joints are short and stout, and bear four long 

 fllamentiferous setre similar to those of the anterior foot-jaws. The end joint is small 

 and rudimentary, and terminates in one short and two long non-plumose hairs. The 

 swimming-feet are as in Hemicalanus longicornis ; the five pairs are 2-branched and 

 each branch 3-jointed, all of them being more or less thickly beset with short spinous 

 hairs. The basal joint of the outer branches of the first pair bears on its posterior distal 

 angle an elongate spine, which extends to the extremity of the last joint. The exterior 

 distal angles of the first and second joints of the outer branches of the third and fourth 

 pairs bear one very stout spine, having a short spinous process on each side of it at its 

 base. Abdomen short, 3-jointed, the first joint much longer than the otherjtwo together. 

 Caudal stylets short, somewhat divergent, each with six plumose hairs, four terminal, 

 which are moderately long and subequal ; a smaller one on the lower outer margin, 

 and one very slender hair near the base of the second terminal seta, counting from the 

 inside. 



Habitat. (1) Station 3, 100 fathoms tow-netting, January 2nd (day collection), specific 

 gravity of the water 1-0260S, temperature 56"-4 F. (2) Lat. G° 38' N., long. 12^ 37' W., 

 25 fathoms tow-netting, January 6th (day collection), sp. g. of the water (surface) l"02i00, 

 temperature (surface) 83°-5 F. (3) Lat. 1° 55' 5" N., long. 5° 55' 5" E., 35 fathoms 

 tow-netting, January 22nd (day collection), temperature at 30 fathoms 63°"98 F. (1) Off 

 Sao Thome Island, lat. 0°3i'N., long. 6° 20' 4" E., 20 fathoms tow-netting, January 23rd 

 (day collection). 



Only one adult specimen and a few others more or less immature were obtained ; the 

 adult specimen is from locality (3), and is the one from which the drawings were made. 



The peculiar short flat-topped filaments (sense-organs ?) with which several of the 

 hairs of the maxilla? and foot -jaws are furnished resemble those observed and described 

 in Atlcjaptilis longiccmdahis, which Prof. Claus speaks of as " sehr zierlich geknopfte 

 Seitenspitzen," but instead of the tops being circular like a button, as in that species, 

 they are broadly crescent-shaped; the " bvitton-tops " are also larger than those of 

 Augaptilis longictmdatiis. In AngaptiUs Rattrayi there are about forty button-topped 

 filaments in the length of a millimetre, but in Aifgctptilis lofigicaitdatus the number of 

 filaments in a millimetre is about one hundred and forty-seven. The filaments in each 

 double row are usually opposite each other, as shown in the enlarged drawings. They 

 give a pecuHar and striking appearance to the setse that are provided with them. 



Genus Calocalanus, Giesbrecht (1891). 



Elenco dei Copepodi pelagici,— R. Corvetta ' Vettor Pisaiii.' (Atti della Reale Accademia 



del Lincei, serie iv. Rendiconti, vol. v. pt. 1.) 



Calocalanus pavo (Dana). (PI. VI. figs. 9, 10.) 



1852. Calanus jnivo, Daua, loc. cit. p. 1061, pi. 72. 



1892. Calocalanus pavo, Giesbrecht, op. cit. p. 185, pis. 1, 4, 9, 36. 



