42 THE VOYAGE OF H.M.S. CHALLENGER. 



front, e left valve /right valve ; all magnified 40 diameters. Plate III. fig. 2, a-b. a 

 Second maxilla of male, h second foot.] 



2. Macrocypris catiariensis, n. sp. (PI. II. fig. 3, a-d). 



Carapace, as seen from the side, elongated, arcuate, highest in the middle, the dorsal 

 margin forming one continuous arch as far as the extremities, both of which are subacute ; 

 ventral margin nearly straight ; height equal to one-third of the length ; seen from above, 

 the outline is elongate-ovate, more than thrice as long as broad, widest in the middle, 

 and tapering gradually to the extremities, both of which are acuminate. Surface of the 

 shell quite smooth. Length, l-12th of an inch (2'1 mm.). 



Only one example of this species has been noticed. It occurred in a dredging from 

 a depth of 620 fathoms, ofi" the Canary Islands, on a bottom of sandy mud and shells 

 (Station 8). 



[PL II. fig. 3, a-d. a Carapace seen from left side, b from above, c from below, d 

 from front. Magnified 30 diameters.] 



3. Macrocypris similis, n. sp. (PI. II. fig. 2, a-d). 



Carapace, as seen from the side, elongated, siliquose, highest in the middle, height not 

 equal to one-half of the length ; anterior extremity broadly rounded, posterior acuminate 

 at the ventral angle ; dorsal margin strongly arched, sloping gently towards the front, 

 and with a steep curve to the ventral angle ; ventral margin sinuous, incurved in the 

 middle ; seen from above, ovate, widest in the middle, nearly thrice as long as broad ; 

 extremities acute ; end view subcircular, width less than the height, Shell-surface 

 smooth and polished. Length, 1-1 2th of an inch (2'1 mm.). 



Habitat.— OS Pernambuco, lat. 8° 37' S., long. 34° 28' W., 675 fathoms, mud 

 (Station 120). From a sounding in a depth of 160 fathoms oil" the coast of Patagonia, 

 and ofi" Ascension Island, 420 fathoms. 



This is perplexingly like in its general characters to the next described species, Macro- 

 cypris orientalis ; but it is at least twice as large, and somewhat more compressed. 



[PL II. fig. 2, a-d. a Carapace seen from left side, b from above, c from below, d 

 from front. Magnified 30 diameters.] 



4. Macrocypris orientalis, G. S. Brady (PL II. fig. 4, a-d). 



Macrocypris orientalis, Brady, Les Fonds de la Mer, torn, i., p. 61, pi. vii. figs. 1-3. 

 (?) Cytherina acuminata, Alth.., Eeuss in Haidiuger's Abhandl, 1850, vol. iv. p. 49, tab. vi. 

 fig. 7, a-c, and fig. 8. 



Except in its much smaller size, and in being more robust, there are no characters 

 in this species to separate it from Macrocypris similis. Its length is l-27th of an inch 

 (•9 mm.). 



