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



the outline is regularly ovate. Length, l-14th of an inch (TS mm.) ; height, l-17th of 

 an inch {1'5 mm.). 



Two specimens taken in the surface-net at Zamboangan, 25th October 1874. 



This species belongs probably to the restricted genus Cypridina, but the dissection of 

 a single very imperfect specimen has not been sufficient to settle the matter. Dana's 

 description, penned long before the researches of G. 0. Sars had led to the breaking up 

 of the old genus Cypridina, is not sufficiently minute to help much, even if one were 

 quite sure that it referred to the species here described. The resemblance to Dana's 

 figures is, however, so close that we need scarcely entertain much doubt as to its 

 identity. 



[PL XLII. figs. 9-11. 9 Carapace seen from left side, magnified 40 diameters; 

 10 Portion of shell showing reticulated structure ; 11 Secondary branch of posterior 

 antenna.] 



2. Cypridina gracilis, n. sp. (PL XXXVIL figs. 1-11). 



Carapace oblong, ovate ; seen from the side, rather narrower in front than behind, 

 height equal to two-thirds of the length ; notch of moderate size, beak short and sharp, 

 posteiior extremity broadly and evenly rounded, anterior considerably narrower, dorsal 

 and ventral margins regularly and moderately arched ; seen from above, the outline is 

 compressed, ovate, rather narrower in front than behind, more than twice as long as 

 broad ; end view ovate, width equal to two-thirds of the height, rounded on the dorsal, 

 and somewhat narrowed towards the ventral, margin. Surface of the shell quite smooth. 

 The first and second joints of the anterior antennae (fig. 4), are much the largest, the 

 fourth and fifth considerably smaller, the third, sixth, and seventh, the smallest of all. 

 The second joint of the mandibular foot (fig. 6) has at the apex two separate setae, and a 

 slender short bisetose appendage ; the fourth joint is much elongated, constricted in the 

 middle, and bears on its outer edge a series of about eight, setse. Length of the shell 

 l-5th of an inch (5 mm.). 



Dredged in a depth of 1000 fathoms, lat. 37° 24' N., long. 25° 13' W., bottom of 

 giobigerina ooze (Station 78). 



[PL XXXVII. figs. 1-11. 1 Carapace seen from right side, 2 from above, 3 from front 

 (magnified 9 diameters), 4 anterior antenna, 5 posterior antenna, 6 mandibular foot, 

 7 first and third maxillae, 8 second maxilla, 9 end of oviparous foot, 10 part of a spine of 

 the same more highly magnified, 1 1 postabdominal laminae.] 



3. Cypiridina dance, n. sp. (PL XXXVL fig. 2, a-d). 



Carapace as seen laterally, irregularly subrhomboidal, notch of moderate size, and 

 seated in the middle of the oblique anterior extremity, beak small and sharp, posterior 

 extremity produced into a truncated or subconical median beak ; dorsal margin boldly 



