240 



University of California. 



[Vol. i. 



form apparently similar in this respect to Hagiastrum. From Angel 

 Island. 



Suborder, Cyrtoidea, Haeckel. 

 Genus, Dictyomitra, Zittel. 

 Sp. a (Fig. 15). Test elongated, conical, summit acute; gradu- 

 ally and evenly increasing in width to the base. There are five or 

 six transverse partitions or constrictions. No perforations shown. 

 Length .27 to .301 mm., width at base from .1 to .13 mm. This is 

 not an uncommon form; it occurs both at Angel Island and Buri- 

 buri Ridge. 



Sp. b (Fig. 16). Test conical, summit obtuse, gradually increas- 

 ing in width to the base. There are nine or ten nearly straight 

 transverse partitions, about an equal distance (.025 mm.) apart. 

 Length .26 mm., width at base .14 mm. Rare. Buri-buri Ridge. 



Sp. c (Fig. 17). Test elongate conical, summit obtuse, very 

 gradually increasing in width to the base. There are about five 

 projecting ridges, which represent as many constrictions or segments. 

 Length .2 mm., width at base .08 mm. Not uncommon. Angel 

 Island. 



Genus, Lithocampe, Ehrenberg. 

 Test subcorneal, summit obtuse (Fig. 18); in the upper por- 

 tion there are two or three small partitions and two larger below. 

 The aperture constricted. Length .085 mm., width a short distance 

 above the base .08 mm. Rare. Buri-buri Ridge. 



Genus, Sethocapsa, Haeckel. 

 Flask or pear shaped, surface smooth, no perforations shown. 

 (Fig. 19.) Length .21 mm., greatest breadth .135 mm. Angel 

 Island. Rare. 



EXPLANATION OF PLATE I 4. 



Note. — The heavier shading on the outside of the figures is intended to 

 represent the rock matrix in which the forms are imbedded. Scale, nat. x 200. 



