100 Mil. T. SCOTT OX ENTOMOSTRACA 



long sette on its outer nearly straight marg-in, and another on the inner lateral margin; 

 the hroadly triangular portion oi' the basal joint hears one apical and two suhapical 

 stout plain seta?, and two slender setse spring from the anterior margin (fig. 50). Caudal 

 stylets very short, fringed with long slender serrse ; the longer of the tAvo principal terminal 

 setae is fully twice the length of the abdomen. Ovisacs two. 



Habitat. Accra, in a shore gathering collected January 16th. Off Sao Thome 

 Island, in a tow-net gathering from 20 fathoms, collected January 23rd, and in a 

 tow-net gathering from a lagoon by the shore of Sao Thome Island, collected 

 January 23rd. 



A form, which is probably the male of the Dactylopus now described, occurs in the 

 same gatherings with it. The only important difference is in the anterior antennae, 

 which are somewhat longer and 8-joiuted ; they are hinged between the fifth and sixth 

 joints. But though the anterior auteuuse of the male usuallj^ consist of the same 

 number of joints as in the female, and frequently of a fewer number, it occasionally 

 happens that they are composed of more joints — as, for instance, in I/i/ojysi/Ilns coriaceus 

 (Brady and Bobertson *) and Ilyopsi/llns ajjiiiis, described in this Report, in both of 

 which the male antennai consist of a greater number of joints than those of the female. 



The first swimming-feet of the male of Dactylopus projjinquus are similar to those of 

 the female already described ; the second pair resemble those of the male of Dactylopus 

 Stroma (Baird). The first abdominal segment is provided with a pair of trispinose 

 appendages as shown in PL XL fig. 3 (see also PI. X. fig. 41). 



Genus Thalestris, Claus. 

 Thalestris, Claus, Die freilebenden Copepodeu, p. 128 (1863). 

 Thalestris forpicula, Claus. (PI. XII. figs. 33-11.) 



1863. Tlialeslris forjicula, Claus, Die freilebenden Copepoden, p. 131, pi. xvii. figs. 7-11. 



Habitat. In a shore gathering from Accra, collected January 16th. 



The length ("5 mm.) of the ' Buccaneer ' specimen is less than that stated by Claus, 

 which is 'S mm. The anterior antennae are 8-jointed ; the relative lengths of the joints 

 being nearly as shown by the annexed formula : — 



9.8.6.5.4.4.3.4 

 12 3 4 5 6 7 8' 



The secondary branch of postei'ior antennae 2-joiuted. First pair of swimming-feet 

 elongate, the inner branches considerably longer than the outer ; terminal claws short and 

 stout. Inner branches of the second, third, and fourth pairs shorter than the outer 

 branches : in the fourth pair the inner branches reach only to about the end of the second 

 joint of the outer branches, while the outer branches are long and slender, Avith a long 

 slender terminal sjiine, ciliate on the outer edge (fig. 39). Second joint of the fifth pair 



* Brit. Copep. vol. ii. pi. Ixxxii. fig. 4. 



