518 MESOZOIC FLORAS OF UNITED STA'IT.S. 



tlioni arc rhizomes, many with tulu'i'des attached. These are globular in 

 form, proportionally large in size, and they seem to grow in pairs, one on 

 each side of the rhizome, opposite to each other. PI. CIX, Fig. 10, shows 

 one of these rhizomes. Most of the specimens were collected on October 

 2, 1892, and all at the locality on the east side. The one figured was col- 

 lected on July 7. 1893. 



Onyciiiopsis psilotoides (Stokes & Webb) Ward." 

 PI. CXIII, Fig. 1. 



The only specimen of this plant that was found, a rather poor one, 

 has been drawn to form Fig. 1 of PI. CXIII. It is a portion, 6 cm. long, 

 of a penultimate pinna with a number of parts of ultimate pinnae attached 

 to it, and some detached, all carrying fragments of pinnules. Some of 

 these show distinctly the characteristic narrow acute lobes and teeth 

 of the species. It is similar to the form figured in Monograph XV, pi. 1, 

 fig. 2. It was collected by Professor Ward and Doctor HoUick on October 

 2, 1892. 



Thyrsopteris rarinervis Fontaine.'' 

 PI. CXIII, Figs. 2, 3. 



As above stated, Thyrsopteris rarinervis is the most abundant fossil 

 found here. No fewer than 60 specimens were ol)tained, and many 

 more might have been secured had it been desirable. Some of them 

 are pretty well preserved. One of these is drawn to form PI. CXIII, 

 Fig. 2. It shows considerable portions of several penultimate pinnae 

 with good ultimate ones, carrying well-preserved pinnules. Most of 

 the specimens, however, are fragments of ultimate pinna^. 



This fern seems to have had very long, slender stipes, which some- 

 times are shown without any foliage, and then seems to be a fossil quite 

 different from that in which the foliage is shown. PI. CXIII, Fig. 3, 

 shows an extreme case of this kind. The specimens all come from the 

 locality on the east side of the reservoir. One was obtained on October 

 2, 1892, and one on July 7, 1893. The rest, including the ones figured, 

 occur in the original collection made on September 18, 1892. 



" For llie synonymy of this species see p. 1.55. 

 '' For the synonymy of this species see p. 225. 



