G. C. KAROP ON STAURONKIS LEGQMEN. 367 



kindly undertook to ask Signor Pero, but, at any rate as yet, I 

 have not received any. I also wrote to Dr. A. M. Edwards, of 

 N"ewark, JSTew Jersey, U.S.A. It would be very interesting 

 to compare specimens named by competent observers from 

 different localities to see how far they correspond. In a 

 paper in the Proceedings Acad. Nat. Sci. of Philadelphia, 

 published in 1865, by Dr. F. W. Lewis, entitled "On some 

 extreme and exceptional variations of Diatoms from some 

 White Mountain localities," I find a figure (Plate II., Fig. 14) 

 of St. legumen, so-called, styled " the aberrant variety," which 

 differs greatly from the type form, being without apiculated 

 extremities and possessing no inflations, and Mr. Grove informs 

 me that it is not St. legiime?i at all, but, according to Cleve, the 

 St. obtusa of Lagerstedt, described in his Diatoms from Spitz- 

 bergen. Gregory also gives a figure of St. legumen in the plate 

 accompanying his paper on " IS^ew Species of Brit. F. W. 

 DiatomaceiB " in the Quart. Jour. Micros. Sci. for 1856 (Plate 

 I., Fig. 9), but there is no comment in the text. 



In order that these various figures may be compared without 

 the trouble of consulting the several authors cited, I have 

 copied them as faithfully as possible on Plate XVIII. , including 

 an original figure of the Lea form, and I trust we may have 

 some further communications on this interesting subject. 



It should be stated that St. legumen^ St. liiiearis, with some 

 half-dozen other allied forms, including St, acuta, now constitute 

 the division ' Pleurostaurum ' of Habenhorst, which Grunow 

 and Cleve have adopted, altering the final syllable um to on, 

 thus ' Pleurostauron.' 



While these remarks were in the printer's hands I received 

 some slides (and material) from Dr. Edwards, labelled ' Raised 

 Coast Period, Peddie Street Ditch, Newark, N.J.,' which he 

 said contained a few specimens of tire form figured by Lewis, 

 and which, in his opinion, in spite of the difference in outline 

 from the Chili or type form of Ehrenberg, were to be referred 

 to S. legumen. 



Unfortunately the slides were mostly broken in transmission, 

 but by careful examination I have found one or two of the 

 diatoms in question, which appear to me to be intermediate 

 between Lewis's ' aberrant variety ' and S. linearis, possessing 

 the entire outline of the former with the apiculated extremities 



