FROM THE GULF OF GUINEA. 131 



Habitat. Lat. 1° 55' 5" N., long 5' 55' 5" E., in a tow-net gathering from 30 fathoms, 

 collected January 22nd. One specimen only was obtained. 



Hessella, Brady. 



Hessella cylindrica, Brady. 



1883. Hessella cyl'indnca, Brady, ' Cliallcnger' Copepoda, p. 13G, pi. Iv. figs. 9-13. 

 18G0. ? Baculux elnnyatus, Lubbock, Trans. Linn. Soc. vol. xxiii. p. 190, pi. xxix. fig. 40. 



Habitat. Station 3, in a tow-net gathering from 25 fathoms, collected January 2nd. 

 Only one sjiecimen of this interesting species was obtained. 



This appears to be the Baculus elongatm, Lubbock, described by Sir John Lubbock 

 in his paper " On some Oceanic Entomostraca collected by Caj)tain Toynbee," and 

 imblished in vol. xxiii. of the Transactions of the Linnean Society. If my con- 

 jecture is right, Sir John Lubbock's name must take precedence of that of Dr. Brady. 



Incert.e Sedis. 



PONTOPSYLLUS BLONGATTJS, U. g. et sp. (PI. XIV. figS. 24-30.) 



Length 2'23 mm. (1-llth of an inch). Body cylindrical ; first segment four sevenths 

 of the whole length of the animal and equal to twice the combined length of the remaining 

 three segments, which are subcqual. Abdomen very short, composed of four segments ; 

 the two intermediate segments, which are of about equal length, are shorter than the 

 first or fourth. Caudal stylets rudimentary and furnished with a moderately stout 

 curved plumose terminal seta and three small marginal ones ; the integument of the last 

 abdominal segment is covered with minute cilia, and the terminal seta of each of the 

 caudal stylets is curved inwards (fig. 24). Anterior antenniB short, 5-jointed, bearing a 

 few scattered hairs ; the anterior distal angle of the basal joint is provided with a long 

 plain seta that reaches beyond the apex of the antenna. The proportional lengths of the 

 joints are as follows : — 



27 -IS . 15. 15 . 1 8 



T 2 3 4 5 ■ 



The posterior antennae are 2-jointed and very short and stout ; a strong curved claw, 

 articulated to the exterior half of the truncate apex and opposed by a stout pointed 

 tooth, forms a powerful grasping-organ (fig. 20). Mandible and maxiUge rudimentary ; 

 the first consists of a simple, somewhat stylet-shaped appendage, the other of two strong 

 hooked spines attached to a stout 1-jointed basal part (figs. 27 a, b). Posterior foot-jaws 

 large ; the dilated basal joint carries an elongate, slender, apical appendage, the distal end 

 of which is clothed with fine cilia, and, becoming gradually attenuated, terminates in a 

 small spiral coil of about one-and-a-half turns, as shown in figure. The four pairs of 

 swimming-feet are all similar and consist of two short 2-jointed branches ; the exterior 

 distal angles of the joints of the outer branches are furnished with stout dagger-shaped 

 spines, finely serrate on both edges ; the broad terminal spines, which are more than twice 



