EHIZOPODA FROM NORTH AND SOUTH AMERICA. 215 



the animal is scarcely distinguishable from C. flava ; for this reason 

 Dr. Penard is now o£ opinion (private letter) that it should be regarded as a 

 variety of that species. 



Diameter 93-100 fju. 



Distribution. — Rio Janeiro, Brazil. 



Nebela caudata, Leidi/ (6), p. 160, pi. 26. figs. 21-24. (PI. 15. fig. 17.) 



Although never numerous this species is widely distributed throughout 

 the vvorld. In order that a comparison can be made with JY. spicata, sp. nov., 

 a drawing; is o-iven of an individual from near the summit of Corcovada Mt. 



Length, without spines, 80-90 /ju ; breadth 65-75 fi ; aperture 20-25 /x : 

 spines 3 or 4 in number. 



Distribution. — Brazil, Bolivia, and Peru (7) ; Gough Island (13) ; United 

 States (6, 16) ; Canada (11). 



Nebela cockayni (Penard). 



Syalosphenia cockayni, Penard (11), p. 238, pi. 22. fig. 5. 



The individuals found by Penard in Oceania possessed transparent tests 

 with very faint indications of the plates or scales ; those at Puntas Arenas 

 are distinctly marked, having typical Nebela-Yike tests composed of small 

 oval plates closely cemented together ; they are considerably larger than any 

 previously recorded, also less compressed, the thickness being about 0*6 of 

 the breadth ; the aperture in one case was 2'^ X 10 /x, in another 25 X 14 //., 

 being narrowly elliptical. There are, as shown by Penard, two small pores 

 in the sides of the neck and no other openings in the body of the test. Only 

 empty tests were found. 



Length 120-126 /i ; breadth 74-75 jx ; aperture 25-28 yu, ; thickness 42 /*. 



Distribution. — Puntas Arenas ; Australasia (11) ; Auckland Islands (1. 89- 

 100 ^Ji) ; Sydney (1. 100 ^Ji)■, Mt. Cook, New Zealand (1. 115 /i). 



Nebela dentistoma var. hesperia, var. nov. (Pi. 15. fig. 13.) 

 In addition to a few individuals of the typical N. dentistoma, Penard, a 

 form with a much larger test was found numerously in some gatherings, 

 which is here recorded, at least for tne present, as a variety of that species ; 

 a future examination of living individuals may perhaps result in it being- 

 regarded as an autonomous species. The following is a description of the 

 tests, no information as to the plasma, etc., being available. 



Test large, pyriform, compressed, composed of oval, round, or square plates 

 in varying proportions with an occasional admixture of diatom frustules and 

 Englyplia scales ; transverse section elliptical ; aperture elliptical, its border 

 not thickened, slightly undulate and usually formed of o\al scales; in narrow 

 side-view, the fundus rounded, and the sides tapering in convex lines to the 

 aperture. 



