24 One Thousand Objects 



ends rounded. Each segment is somewhat square at the 

 base, with concave sides, from which the end lobe is se 

 parated by a deep notch on each side. (PI. III., fig. 



7-) 



172. WARTY EUASTRUM (Euastrumvermcosnni). This 

 is a very characteristic species, though not so common as 

 some others. The surface is rough with warty granules ; 

 each segment is broader than long, being broadly wedge- 

 shaped and three-lobed, each lobe with a concave de- 

 pression in the centre. 



173. TRIANGLE EUASTRUM (Euastrum didelta). In 

 this species each segment is pyramidal, the basal corners 

 rounded, the sides with a convex projection, the ends 

 flattened and squared, with a narrow terminal notch. (PL 

 III, fig. 8.) 



174. EARED EUASTRUM (Euastrum ansatuni). Smaller 

 than the last, each segment triangular, with a blunt apex, 

 the sides concave and the apex notched. (PL III., fig. 9.) 



175. PECTINATE EUASTRUM (Euastntm pectinatuni). 

 Each segment in this species is three-lobed, the end lobe 

 being broad, almost flat ; the side lobes with a concave 

 depression or blunt notch in the centre. The whole plant 

 is twice, or more, longer than broad. It is not so common 

 as many other species. 



176. ELEGANT EUASTRUM (Euastrum elegans). This 

 is a very minute species, of an oblong form, with a broad 

 shallow notch on each side, and a broad end notched in 

 the centre. (PL III., fig. 10.) 



177. CRENATE COSMARIUM (Cosmarium crenaiuni). 

 About twice as long as broad, divided at the centre into 

 two equal lobes, which are flattened at the sides and end, 

 and the margin crenate, or serrated with blunt rounded 

 teeth. Smaller than the next. (PL III, fig. n.) 



178. PEARLY COSMARIUM (Cosmarium margaritifenini}. 

 The commonest species of its genus. The surface rough 

 with little granules ; divided into two kidney-shaped seg- 

 ments, which sometimes are almost circular. (PL III, 

 6g. 12.) 



179. PYRAMID COSMARIUM (Cosmarium pyrawidaluni). 



