FEOM THE GULF OF GUINEA. 135 



covered with minute clots that appear to have a linear arrangement when viewed iu 

 certain positions. Length of shell '61 mm. (l-41st of an inch). Antennules 7- 

 jointed, hasal joint large, the others small ; the formula shoAv s the relative lengths of the 

 joints : — 



32 . 10 ■ 11 . 8 ■ 7 . 6 . 9 

 1.2.3.4.5.6.7' 



The last tw^o or three joints are provided with several long plain sette ; there are also a 

 few scattered sette on the other joints. Antennae 4-jointed; the proportional lengths 

 of the joints are as follows : — 



10 ■ 14 ■ 10 . 4 

 1.2.3.4' 



Pive long and nearly equal setse spring from the end of the second joint ; the terminal 

 claws reach only to about the middle of the setse. Post-abdomen moderately stout, 

 armed at the apex with two strong, curved, and nearly equal claws, and a small seta ; a 

 small seta also sj)rings from near the middle of the lower margin of the post-abdomen. 



Sabitat. Lat. 5° 53' 0" S., long. 11 31' 1" E., in a surface tow-net gathering collected 

 11.30 P.M., February 18th. (Off the mouth of the Ptiver Congo, about 40 miles from 

 land.) 



A considerable number of specimens w'ere obtained. The occiu'rence in the open sea 

 of a species so closely related to a freshwater Cijpria is of interest as forming another 

 link connecting the truly freshwater with the truly marine Ostracoda. 



Pigure 33, PI. XIV., is that of an immature specimen. 



Phltctenophora, Brady (1S80). 



Phlyctenophora africana, n. sp. (PI. XIV. figs. 31, 35 ; PI. XV. figs. 17-19.) 

 Shell elongate ovate ; seen from the side the dorsal margin forms a depressed arch, 

 rather highest in front of the middle ; ventral margin sinuated in front, gently 

 convex behind ; anterior extremity somewhat attenuate and evenly rounded ; posterior 

 margin slightly produced and angular below the middle ; greatest height equal to five 

 tAvelfths of the length. The outline seen from above is compressed ovate, widest in the 

 middle ; greatest width a little more than a third of the length ; sides tapering similarly 

 and evenly to both extremities, which are subacute. Length 1 mm. (l-25th of an inch). 

 Antennules 7-jointed ; relative lengths of the joints nearly as in the formula : — 



22 . 5 . 5 . .5 . 6 . 4 . 4 

 12 3 4 5 6 7' 



The last joint bears a moderately stout and long apical spine ; the other joints are more 

 or less setiferous; setse plain. Anteimse 6-jointed, sparingly setiferous ; the first three 

 joints large, the last three small, as shown by the relative lengths of the joints given in 

 the formula : — 



17 . 16 . 17 . 4 ■ 7 . 3 



1 2 3 4 5 6' 



