14" 



TllK AMI-: Kir AN MONTHLY 



[Miiy. 



hi:it<»iiis of tlir ("tuiiUM'ticut Slioiv. V. 



l\\ W M A. Tl KK\ . 



IIKI.STOI., CUNN. 



M . liinjHic ot I'aris writes that in clcaiiiiiL; llic Naiiiplcs of 

 cartli from the Lectin's Islam! deposit he t'aileil to liiul manv varie- 

 ties which were shown in the sliiles previously sent to liiin. The 

 earth was thrown out in ili«j^in^ for foundations for a railroad 

 hritlge across Leele's creek. After di<;<^in<; stinie seven feet, piles 

 were driven through the deposit ^o or more feet and the abutment 

 was Iniilt up on the piles. The earth was carted away in wlieel- 

 harrows ami dumped. The strata became hopelessly mixed. 

 Besides, the same stratum vai ies <^reatly in richness witliin a few 

 lect of horizontal distance, as will be readily understootl when the 

 method of deposit is stuilieil. The rise of the tide aloiijj the 

 Connecticut shore averajrcs about six feet, causing powerful cur- 

 rents in the bavs and inlets, which deposit the diatoms in eildies 

 and basins. As frecjuent changes occur, the diatoms are very 

 unequallv distributed. In describing the diatoms of Morris cove, 

 in an article published in this Jol'UN.vl in Deer, i8SS. I siiowed 

 how certain varieties grow in narrow belts or zones, limited by 

 the depth of water. These belts were only a few feet in width 

 but some miles in lengtii, and occurred one after the otlier from 

 the shallow margin to about 15 feet ilepth of water at low tide. 

 Subsequent investigation has shown that tiiis arrangement is per- 

 manent, and I can always rely upon linding certain varieties in 

 active life along a line at a particular depth and (hstance from the 

 beach. This shows how useless it is for an explorer to make a 

 dip here and a sounding there, and go away with the idea that he 

 umlerstands the diatoms of any locality. Persistent and syste- 

 matic search is needed in order to arrive at anything like the 

 truth. The following list is from the 15th fascicule of the collec- 

 tion of J. Tcmpere and H. Peragallo. 



No. 492. Leete's Island, U. S. A.. No. i. Lolrd. 



Aclinocvdus ehrenbergii Ralfs. 

 Actinoptvchus undulatus E. 

 Amphiprora elegansSm. 

 pulchra Bail. 

 Biddulphia pulchella Graj. 



rhombus Sm. 

 Coscinodiscus excentricus E. 

 oculus iridib E. 

 radiatus E. 

 Lithodesmium undulatum E. 

 Melobira sulcata K. 

 Navicula formosa Greg, et var. 

 fusca Greg. 

 Ivra E. var. 

 granulata Breb. 

 marina Ralfs. 

 Nitzschia circumsut.i Mail. 



Nitzschia scalaris Sm. 



sigma Sm. 

 Pleurosigma affine Grun. 



balticum Sm. var. 

 strigosum Sm. 

 wansbeckii Donk. 

 Pjxilla dubia Grun. 

 Raphoneis gemmifera E. 

 Rhabdonema adrialicuni K. 

 Scoliopleura tuniida Brcb. 

 Stauroneis salina Sm. 

 Surirella fastuosa E. var. 

 febigerii Lewis, 

 striatula Turpin. 

 Terpsinoe musica E. 

 Triceratium antediluvianum E. 

 t'avus E. 



