8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 128 



Type species. — Proteonina jusiformis Williamson, 1858. Subsequent 

 designation by Rhumbler (1904, p. 244). 



Diagnosis. — Test elongate, fusiform in outline, consisting of a sub- 

 globular proloculus and elongate, flask-shaped later chambers, few in 

 number; sutures somewhat obscure or slightly constricted from the 

 exterior, nearly horizontal ; wall agglutinated, with coarse particles ; 

 aperture terminal, rounded, slightly produced. 



Types. — Williamson's types are deposited in the B.M.N.H., lecto- 

 type (here designated) No. ZF 3605 (fig. 2) and paratype No. 

 96.8.13. 1 (figs. 3a, b), both Recent, from Skye, in sand dredged by 

 Mr. Barlee. 



Discussion. — Williamson's figured specimen was a three-chambered 

 form (a typical Reophax) with somewhat indistinct sutures due to the 

 coarseness of the particles in the agglutinated wall. Williamson ( 1858, 

 p. i) stated in his generic diagnosis that Proteonina possessed "a 

 slight disposition in its young state to become convoluted" ; but he 

 says also, 'T have hitherto failed in tracing any internal septa in the 

 Proteonina." 



Williamson described also P. pseudospiralis (1858, figs. 2, 3), but 

 his types are apparently lost. From the illustrations it seems to be 

 generically distinct from P. fusiformis, as it is compressed and has a 

 narrow slitlike aperture and the outline of the test suggests an initial 

 coil. 



Proteonina thus is a multilocular, uniserial agglutinated form, and 

 not a single-chambered form as has been commonly considered. The 

 name Proteonina is therefore suppressed as a synonym of Reophax 

 Montfort, 1808. The majority of other species that have been placed 

 in Proteonina can be placed in Saccammina Sars, 1869, Lagenammina 

 Rhumbler, 191 1, or other genera, and there seems no necessity to 

 create another generic name to replace Proteonina. 



PLANCTOSTOMA Loeblich and Tappan, new genus 

 Plate I, figures 6-12 



Type Species. — Textularia luculenta Brady, Rep. voyage Chal- 

 lenger, vol. 9 (Zoology), p. 364, pi. 43, figs. 5-8, 1884. 



Derivation. — plank tos Gr., wandering, roaming + stoma Gr., mouth. 

 Gender, neuter. 



Diagnosis. — Test free, elongate, chambers biserially arranged, but 

 in rare specimens the last chambers may lose the biseriality and be- 

 come central, very rarely the last few chambers being uniserial; wall 

 agglutinated, simple in structure; aperture at the base of the last 



