REPORT ON THE OSTEACODA. 67 



produced in the median line both above and below ; surface of the valves marked through- 

 out -ttdth large, closely-set, angailar fossae. Length, l-40th of an inch ("66 mm.). 



Dredged off Booby Island, lat. 10° 36' S., long. 141° 55' E., 6 to 8 fathoms. The- 

 nearest known ally of this species is jirobably the familiar Cythere tuherculata, Sars, an 

 abundant North Sea species. The southern form is, however, much more regularly ovate 

 in contour, has fewer surface rugosities, while, in lateral ^'iew, it has its extremities more 

 evenly rounded, and is destitute of any marked angular elevation in the situation of the 

 anterior hinge-joint. 



[PI. XIV. fig. 4, a-d. a Shell seen from left side, 6 from above, c from below, 

 d from front. Magnified 60 diameters.] 



9. Cythere fidvotincta, n. sp. (PI. XIV. fig. 5, a-d). 



Shell compressed, oblong ; seen from the side, subreniform, scarcely higher in front 

 than behind, height equal to somewhat more than half the length ; anterior extremity 

 boldly rounded, posterior subtruncate, scarcely rounded ; dorsal margin gently arched, 

 obscurely angulated behind, ventral slightly sinuated in the middle ; seen from above, 

 club-shaped, widest near the hinder end, the width equal to considerably less than half 

 the length ; anterior extremity broad, produced in the middle, posterior obtusely rounded ; 

 lateral margins protuberant near the hinder extremity, from which point they converge 

 suddenly backwards, and with a gradual sinuous curve towards the front ; end view 

 broadly ovate, sides convex below, and sinuated above the middle, base broad, apex 

 narrowed and truncate. Shell-surface marked with irregularly angular, excavated areola?; 

 anterior hinge-tubercle distinct. Length, l-45th of an inch ('53 mm.). 



Found in anchor-mud from a depth of 6 fathoms, Stanley Harbour, Falkland Islands. 



[PI. XIV. fig. 5, a-d. a Shell seen from left side, h from above, c from below, d from 

 front. Magnified 60 diameters.] 



10. Cythere torresi, n. sp. (PL XIX. fig. 8, a-c). 



Valves, seen from the side, subelliptical, rather higher behind than in front, height 

 equal to more than half the length ; anterior extremity rounded, and produced into 

 four squamous, tooth-like processes ; posterior wider, squamous, and bearing at the lower 

 angle four distinct spines ; the dorsal margin forms a flattened arch ; the ventral is 

 straight or only slightly sinuated ; seen from above, the valves are tumid, and strongly 

 convex in the middle, sloping to either extremity -wdth a hollow curve ; extremities 

 produced and obtuse ; the end view shows a projecting median keel, both above and 

 below, and has two distinct lateral dorsal prominences. The central portion of the valves 

 is much elevated, and is limited by a squamous encii'cling ridge, and the surface is 

 closely set with rounded excavations. Length, l-70th of an inch ('38 mm.). 



One valve only found in a dredging from Torres Straits, 155 fathoms (Station 185). 



