167 



*NitscliIa punctata, Bail. Surirella striatula, Sm. 



Pinnularia nobilis ? Ehr. *Syringidiiim Americanum, Bail. 



" interrupta, Kiitz. * " simplex, Bail. 



" dilatata, B. * " occidentale, Bail. 



*Polymyxus coronalis, L. W. B. Synedra Ulna, Ehr. 

 Pleuroslgma. " acuta, Ehr. 



Pyxidicula ? compressa, B. MS, *Terpsinoe magna, BaU. 



Stauroneis lineolata ? Ehr. * " minima. Bail. 

 Stauroptera aspera, Ehr. " niusica, Ehr. 



" cardinalis ? E. K. * " Tetragramma, Bail. 



" parva. Tetragramma Americana, Bail. 



" lanceolata ? Triceratium alternans, BaU. 



Striatella. " comptum, Sh. 



*Surirella collecta, Bail.=Campy- " favus, Ehr., three 



lodiscus collectus, L. W. B. varieties. 



* " decora. Bail. * " Shadboltii, Bail. 



* " duplex. Bail. Zygoceros rhombus, Ehr. 

 " quatamalensis, Ehr. * " hemitropus, B. 

 " splendida, Ehr. 



The forms marked thus (*) are believed to be new, and are either 

 described on the preceding pages, or will be noticed in connection 

 with the plates hereafter. 



To the above, most of which have been observed by both my 

 father and myself, I can now add several other forms, not observed 

 by him. They are as follows : — 

 Triceratium megastomum, Ehr. Cymbella. 



Ceratoneis ? spii-alis ? Kiitz. Spougiolithis Agaricus, Ehr. 



Eupodiscus crassus. *Amphora obtecta ? B. 



Epithemia. Navicula firma. 



Hyalodiscus Californicus, Bail. 



Together with several Eotalige, Globigerinse, and several minute, 

 undetermined Cocconeidte. 



The following forms are from several different locahties, and will 

 be figured with the preceding : — 



Amphora obtecta. Bail., nov. sp. 



Frustules in front view barrel-shaped, with straight truncated 

 ends ; in lateral view linear-oblong, with concave venter and convex 

 dorsum. Outer portions of valves canoe-shaped ; nodules wanting 

 or obscure. Whole frustule covered T»^ith close transverse strise, 

 which in front view intersect fine longitudinal lines or folds in the 

 connecting membrane, giving the shelly the appearance of being 

 woven over. 



Hab. lat. 0° 19/ 05'' N. ; long. 45° 43^ W W. 



