154 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



SUKIRELLA CURVIFACIES Brun 



(Brun, Lac. Mar., ou Foss. Diat., pi. 15, figs. 36-37; Schmidt, Atlas, pi. 283, 

 fig. 12.) 



The dates of publication of the above two identical diatoms are 

 Brun's name 1895, and the Atlas S. trauensteinii Hustedt, 1912. 



SURIRELLA DEFLEXA A. Schmidt 



(Janisch, Gaz. Exp., pi. 19, fig. 5; Schmidt, Atlas, pi. 20, fig. 2; pi. 205, 

 figs. 5-6.) 



Schmidt's objections to the suggestion of Brun that S. incurvata 

 (pi. 205, figs. 5-6) is a variety of S. ceylanensis Leuduger-Fortmorel 

 and to the suggestion of Grove that it is an abnormality of S. ma- 

 craeana Greville are both correct. But Janisch rightly takes it to be 

 a narrow variety of S. deflexa.- Note the perfect identity of the 

 border and the ribs. These, taken with the curious deflexion of the 

 middle area, make any other view untenable. 



SURIRELLA FACILIS, new species 



Plate 35, fig. 2 



Valve panduriform, the middle constriction gradual and shallow, 

 the ends semicircular; border narrow, transversely lined, and having 

 superimposed upon it minute beads, one to each rib, and alternating 

 with, not opposite, their ends; ribs distinct but very narrow and 

 hyaline, those at the middle part of the valve without enlargement, 

 those toward the ends of the valve very slightly enlarged, thence 

 running to and touching a well-defined central area, the middle ribs 

 being strictly transverse, the end ribs radial; the central area is bor- 

 dered on either side by a strong row of closely set dashes, the two 

 rows approaching at their middle portion and flaring at their ends, 

 the ends being open; faint dashes mark the two wide outer parts of 

 this central area. 



Length, 0.184; wiath, 0.092 mm. 



This diatom is well figured by Janisch (Gaz. Exp., pi. 16, fig. 13), 

 but not named. By comparing it with figure 3 of the same plate its 

 slight similarity to S. macraeana Greville will be seen. It also has 

 some likeness to figure 10 on the same plate, S. studeri, particularly 

 in the width of its border and the narrowness of its ribs. 



Type.— Cat. No. 43686, U.S.N.M. 



SURIRELLA FASTUOSA Ehrenberg 



(Schmidt, Atlas, pi. 4, figs. 7-15; pi. 19, figs. 1, 8, 13; Micro. Journ., 1862, pi. 

 3, fig. 1.) 



A cosmopolitan marine species, with many striking variations. 

 Those figured in Schmidt's Atlas, plate 5, figures 7-9, 11, 14, are 

 peculiar to both Campeche Bay and the Philippine Islands. 



