NATURAL SCIENCES OP PHILADELPHIA. 17 



I had intended, in the present communication, to give a resume of species 

 contained in the "blue clay" of the Delaware river alluvium, and in adjacent 

 localities along the river. This last I shall be obliged to defer; but as 

 several of the figures published in my last paper were designed to illustrate it, 

 I will briefly describe them. 



"Amphora intermedia," n. sp. ? (pi. i., 7 a, b and c). F. V. linear elliptic, 

 or elliptic ; margin of the inflected portion of the valve recurved, resembling a 

 small ala; marginal puncta distinct, V. arcuate, with rounded apices finely 

 striated. 



Hab. Atlantic, N. J., rare. 



This delicate and beautiful species, belongs to the complex Amphoric of Dr. 

 Gregory. Its outline and appearance on the F. V. are suggestive of Amphi- 

 prora, from which genus, however, the absence of the terminal nodules and 

 its valvular outline remove it. The few specimens I have found, do not en- 

 able me to judge accurately as to its average length or striation. 



Navicula n. sp. ? (pi. i., fig. 8) V. rhomboid, with cuneate slightly pro- 

 duced extremities, stria? radiant, moniliform. 



The only specimen I have of this diatom, is a detached valve, from which 

 the figure (pi. L, fig. 8), is taken. 



Hab. Blue clay, Kaighn's point, Del. river. 



Amphiprora puLCHRA,var. p. A. convpicua (Greville )? (pi. i., fig. 10, a and b). 

 I am not sure, whether this fine diatom is identical with that figured in the 

 Mic. Journal as A. conspicua. (Trans. Mic. Soc, vol. ix.,pl. 10, fig. 16). 



My figure, which is carefully drawn from a slide of Rockaway mud, differs 

 certainly from that of the Mic. Journal. The frustules are always twisted, as 

 shown in fig. 10a, pi. i., and the elongated nodules have much the look of 

 canaliculi. Its habit is that of A. pulchra, of which species I have thought it 

 a variety. It rarely attains half the size of that species ; occurs sparingly in 

 many brackish and marine localities. 



Mastogloia elegans, n. sp. (pi. i., fig. 9). F. V. as shown at pi. ii., fig. 16. 

 V. large, lanceolate, elliptic ; extremities sometimes a little produced ; loculi 

 numerous; very minute ; marginal; striae sharp, clear, parallel ; about 36 a 40 

 in 001 // . Median ?wdule laterally produced into a fine point. Habit and 

 growth of M. apiculata, of which species it may be a permanent variety. I 

 have not, however, been able to trace the connection. 



It occurs along with M. angulata, and the above, at Atlantic, N. J., Cape 

 May, (Schellinger's Inlet), and as a pure gathering ; abundant. 



Mastogloia kinsmanii, n. sp. (pi. ii., fig. 15 a and b.) F. V. as shown at 

 fig. 186. V. lanceolate or elliptic, with more or less produced ends ; loculi 

 less numerous than in 31. apiculata or M. elegans ; the central 4 or 5, larger 

 than the others ; (this is a constant character). 



Median line with a narrow blank space on either side, connivent at the 

 apices; slrice sharp, radiant, about 40 in -001. Habit and growth of the pre. 

 cedirg. 



Hab. Cape May, Cold spring, Atlantic marshes. 



Not an uncommon species at the above localities. The frustule is quite 

 thick, and of a dark, chocolate, brown color, when dry. This somewhat 

 doubtful species I have named (provisionally) after my friend Mr. Kinsman, of 

 this city, who first directed my attention to it, and to whom I am under great 

 obligations for aid in mounting and preserving specimens, and for many 

 valuable hints in their study. 



There remain to be noticed, two very similar Naviculae, having strong 

 affinities with JY. Lewisiana, (Grew) One of them (pi. ii., fig. 19.) frequently 

 occurs along with it, and is probably, an early stage of that diatom ; and the 



1865.] 2 



