12 BIOLOGICAL SURVEY OF 



OSTRACODA PODOCOPA 



CYTHERIDAE 



Palmenella americana spec. nov. (fig. 5) 



The shell seen from above has the sides nearly parallel, 

 but divided almost into thirds by distinct sinuses. The pos- 

 terior tips of the ventrolateral wings are acute. Seen lat- 

 erally, the shell has nearly the same shape as in P. limicola, 

 but the ocular node is better developed and there are but two 

 nodes on the posterodorsal portion. 



The terminal portion of the penis is less sharph^ acuminate 

 than in P. limicola. 



Length : Male, 0.69 mm. 



Type : Male, B 172. 



Remarks: This, the second known species of PalmeneUa, 

 bears a close general resemblance to P. limicola (Norman). 

 It has, however, only been taken in comparatively shallow 

 water, 5 to G fathoms, while P. limicola is recorded generally 

 from rather considerable depths, up to 100 fathoms. The 

 chief structural difference is the presence of a well-developed 

 eye in P. americana, which is entirely wanting in the other 

 species. As regards the shell, tips of the ventrolateral wings 

 are obtuse in P. limicola and the posterodorsal portion has 

 three nodes. 



Cythereis inexpectatus spec. nov. (fig. 7) 



The shell is rather transparent and smooth-surfaced. The 

 only sculpture consists of two fins, one near the dorsal mar- 

 gin, the other ventrolateral. The dorsal fin parallels the 

 hinge and is quite near it. The ventral fin forms the lateral 

 margin of the shell as seen from above and consists of a row 

 of triangular points joined together by a very thin lamella 

 of shell. This type of ornament is found, I believe, on no 

 other species of Cythereis. The shells of the two sexes are 

 very similar. 



The penis has the terminal portion rather short and high 

 and the basal part of the dorsal margin produced to form an 

 ano'le. 



