12 American Quarterly Microscopical Journal. 



DESCRIPTION OF XEW SPECIES OF DIATOMS. 



BY PROF. H. L. SMITH. LL.D. 



HomoeocIaJia capitata, n. sp. H. L. S. Hab. Black Rock, 

 Cal. Mr. C. Febiger. Frond membranaceous, umbellately 

 branched: branches elongated, and with cor}Tnbose capitate 

 apex. Frustules linear, valves lanceolate with acute and ver}- 

 slightly constricted apices : frustules densely packed, but not 

 in series, or fascicles: marginal punctae faint. 35 in .001. 

 Length of frustule .cccS in, breadth, .C002 in.; Frond 1.5" to 

 2". Plate III. fig. I. 



I received the material containing this well-marked species 

 from Mr. C. Febiger. who procured it in California as a gath- 

 ering containing his Biddulphia Edicardsi. In this gathering 

 I found the fronds of the present species. The well marked 

 |)eculiarity of corymbose apices, and the close resemblance to 

 Kutzing's Schizomma capitatum suggested the name, possibly it 

 may be Kutzing's species, though he states that the frustules 

 are arranged in rows, but the outline figure which he gives of 

 the frustules agrees, as also the size, with the present form. 

 It is not, however, a Schizonema (Micromcga) since the frustules 

 are unmistakably Xitzschioid. The walls of the filaments are 

 dense, and the frustules so closely packed as to appear opaque 

 even after prolonged burning at a full red heat. 



Meridion intermedium, n. sp. H. L. S. Hab. Knoxville, Tenn. 

 Josiah Curtis, M. D. Frustules sessile, cuneate, margins nearly 

 smooth, valves with verj- faint pervious costae in f. v. which 

 are scarcely discemable in s. v., cuneate, rounded at the larger 

 extremity. Length .00166 to .003. Plate III, fig. 2. 



This curious modification of M. circulare was found growing 



DESCRIPTION OF PLATE m. 

 Fig. I. Homoeodadla capl2ta, n. sp. H. L. S. 

 Fig. 2, Meridian inUrrmdium, n. sp. H. L. S. 

 Fig. 3. Xavicula Kutsingiana, n. sp. H. L. S. 

 Fig. 4. Xavicula pan-ula, n. sp. H. L. S. 

 Fig. 5. Xiizschia Kittoni, n. sp. H. L. 5. 

 Fig. 6. Raphomis auslralii, n. sp. H. L. S. 

 Fig. 7. Rkizc.-cknia Eriensij, n, sp. H. L. S. 

 Fig. 8. CiJtodiscus Baileyi, n. sp. H. L. S. 

 Fig. 9. Amphora mucrcTtata, n. sp. H- L. S. 

 Fig. I a Act-.-nacyclu: Xligjrcu, n, sp. H. L. S. 



