FROM THE GULF OF GUINEA. 137 



Pamily CYTHEEID/E. 

 Cythere, Miiller (1785). 



Cytheue mtjlticava, n. sp. (PL XIV. figs. 42, 43; PI. XV. figs. 13, 15.) 



Shell elongate, rather tumid ; seen from the side, dorsal margin highest and bluntly 

 angular in front of the middle ; thence it slopes gently backwards in a nearly 

 straight line to the rounded, obscurely crenate, posterior end ; anterior uiargin oblique, 

 interiorly rounded and crenulate, ilatteued al)ove, and sloping posteriorly upward to the 

 hinge-prominence. Heigiit rather less than half the length. As seen from above 

 oblong, sides nearly parallel, slightly gibbous in front; width about two fitths of the 

 length ; posterior extremity broadly rounded at the sides, centrally produced and trun- 

 cate ; anteriorly the valves taper gently to the obtusely pointed extremity. Shell 

 ornamented with numerous small circular depressions arranged in irregular lines. 

 Length '77 mm. 



Antennules 6-jointed, first and second joints long, the others small ; their relative 

 lengths ai"e as follows : — 



25 . 27 ■ 10 . 6 . 8 . 10 

 I 2 4~5 6' 



A stout spine springs from the exterior distal angle of the third, fourth, and fifth, and 

 from the apex of the last joint. 



First and third joints of the antennse elongate, subequal, about three times as long as 

 the second joint; last joint very small, aiKl furnished with two apical spines. A long, 

 hair-like appendage carried by the second joint is connected by a duct with a (?) poison- 

 gland situated at the base of the antennae. 



Habitat. Loanda Harbour, in a gathering collected February 13th. A few specimens 

 only were obtained. 



Cytheue sculptilis, n. sp. (PL XIV. figs. 4f, 45.) 



Shell : viewed laterally, the outline of the shell is broad and ol)liquely rounded in front, 

 narrow behind ; greatest height in front of the middle equal to fully half the length ; 

 dorsal margin forming a sinuous declivity towards the posterior end ; posterior extremity 

 subtruncate, somewhat produced below and bluntly dentate ; lower part of anterior 

 margin crenate or bluntly toothed, ventral margin shallow concave. Seen from above, 

 subquadrangular ; anterior end truncate ; sides subparallel, sinuated ; greatest width 

 scarcely equal to half or three sevenths of the length, constricted behind the middle, 

 gently rounded and converging posteriorly. Towards the posterior end the edges of the 

 valves become flattened and are produced backwards, and terminate in obliquely truncate 

 ends as in the figures. Length "54 mm. 



Habitat. With the last in a surface tow-net gathering from a lagoon, Sao Thome 

 Island. One specimen only obtained. 



second series. — zoology, vol. VI. 18 



