REPOET ON THE OSTEACODA. 173 



[PL XLIII. fig. 5, a~c. a Carapace of male (Wellington specimen) seen from left 

 side, h from below, c from front. PI. XLIV. fig. 1 , a-g. a Female (La Plata) seen from 

 left side, h from above, c from below, d from front ; e male (La Plata) seen from left side, 

 yfrom below, ^from front. All magnified 40 diameters.] 



2. Cijtherella lata, n. sp. (PL XLIV. fig. 5, a-e). 



Shell, seen from the side, subelliptical, higher in front than behind, greatest height 

 situated near the middle, and equal to two-thirds of the length, extremities well and 

 evenly rounded, the posterior the narrower of the two, dorsal margin boldly arched, 

 ventral slightly convex ; seen from above, the outline is regularly ovate. Surface of the 

 shell perfectly smooth. Length, l-16th of an inch (l"55 mm.). 



Figure c represents in all probability the left valve of the species, the right valve of 

 which is shown at a and 6. Figures d and e difi'er considerably from the rest, but 

 perhaps not more than is consistent with the sujjposition that they belong to the young 

 of the same species. 



The specimens — all of them detached valves — which I refer to this species were 

 dredged as follows : — ofi" Culebra Island, West Indies, 390 fathoms, mud (Station 24) ; 

 off Azores, lat. 38° 37' K, long. 28° 30' W., 450 fathoms, sand (Station 75) ; off 

 Pernambuco, lat. 8° 37' S., long. 34° 28' W., 675 fathoms, mud (Station 120) ; Torres' 

 Straits, lat. 11° 35' S., long. 144° 3' E., 155 fathoms, sand (Station 185) ; off Ki Islands, 

 580 fathoms, lat. 5° 26' S., long. 133° 19' S., mud (Station 191a). 



[PL XLIV. fig. 5, a-e. a Eight valve seen from outside, 6 from above; cleft valve 

 from outside ; d right valve of young (Ki Islands) seen from outside, e from above. Mag- 

 nified 40 diameters.] 



3. Cytherella dromedaria, n. sp. (PL XLIII. fig. 6, a, h). 



Valves, seen laterally, elongated, subovate, rather higher in front than behind, 

 greatest height situated behind the middle, and equal to rather more than half the 

 length ; extremities evenly rounded, dorsal margin gently arched and raised behind the 

 middle into a gibbous prominence, ventral margin slightly convex ; seen from above, the 

 outline is regularly ovate, widest near the posterior extremity. Surface of the shell 

 perfectly smooth. Length, l-26th of an inch (-98 mm.). 



Except the gibbous enlargement of the dorsal margin, there is no very marked 

 distinctive character apparent in the single valve upon which this species is founded, 

 yet it seems impossible to refer it to any hitherto known form. It was dredged in 

 Simon's Bay, South Africa, in a depth of 15 to 20 fathoms (Station 140). 



[PL LXIII. fig. 6, a, 6. a Left valve seen from the side, h from above. Magnified 

 50 diameters.] 



