168 TRANSACTIOMS OF THE [maR. 19, 
fragments of spicules were common in it, as well as in the clay 
from Dosoris Islands, Pl. 1V., Figs. 4 and 5. 
The last Long Island clay examined was that from Lloyd’s 
Neck, near Cold Spring. There is in the upper portion of Ham- 
mond’s clay bank a bed of diatomaceous earth, and its position 
is shown in the following section given by Merrill : (1. ¢.) 
See? tan ShrAatMMleUL tribes cielotees eee a ce cate 10 feet. 
Qiurarizoravel eas cece Sidi feranaee Teens Sean 
Red:and: blue? ‘“losm™= sor sandy claysseeee- =... 2 ie Ae 
Diatomaceoussesmtlin, .2 iste petece oe Sere on. sade rN oie 
Mellowsand red*stratified ‘sand. ac. aeerm.... . vee 20 a 
ied “plastic clay... <): sMiseale aiaee hey ae eye REM eo 0% 5: ehh 20) Ree 
Brown plastie-clayacer.: = ete<' eho clap Be ee sehen 20 oe 
MOC ala signa ction ey os loscvent SLs SRR esis ooh 143 feet. 
“The bed of diatomaceous earth is of undetermined extent, 
and appears to be replaced a little to the east by a blue clay, 
which, however, contains some diatoms. It is undoubtedly 
equivalent to the bed of ochre which overlies the sand through- 
out the remainder of the section.” 
The following diatoms, all fresh water species, occur in it: 
Melosira granulata [Ehr.] Ralfs. Pl. IV., Figs. 26 and 27. 
Stephanodiscus niagare Ehr. Pl. IV., Fig. 28. 
Epithemia turgida | Ehr.] Kutz. PI. IV. , Fig, 22. 
Encyonema ventricosum, Kutz. PI. IV., Fig. 18, 
Cymbella delicatula, Kutz. 
Cymbella cuspidata, Kutz. Pl. 1V., Fig. 12. 
Nawioula viridis. Kouta. BV is 
* cocconetformis, Greg. Pl. 1V., Fig. 23. 
major, Kutz. 
varians, Greg. 
ee lata. preba Ply UNG. Eo alcic 
Hunotia monodon, Ehr. PI. 1V., Fig. 16. 
Gomphonema capitatum, Fhr. Pl. 1V., Fig. 21. 
Stauroneis Pheenecenteron, Ehr. Pl. 1V., Fig. 24 
Fragilaria construans, Grun. PI. [V., Fig. 20. 
eyneara ajinis, K. B. PIL1V., Fic. 19: 
Campyloneis Grevillet var Regalis. Pl. 1V., Fig. 13. 
Traceratvum trijoliatum. Pl VV. His 5: 
The Melosira and Stephanodiscus are present in countless 
numbers. Only two specimens were found of the T’riceratium, 
and Dr. D. B. Ward, of Poughkeepsie, who has also given me 
much aid in the identification of my material, informs me that 
this species is very common in the diatomaceous earth from 
