304 DEEr-SEA DIATOMACE.E — MANN. 



may have been convey*'*' hew by (he (liilf Stream, wliicli Hows iioith- 

 ward near tins point. 



Uy laborious <'xainination of nearly all tlic lihMatnn' on (lie Diato- 

 macoa' 1 Ibuml it unnecessary lo jfive a new name to a sin<;ie one of 

 the many species discovered. ^Pliis is I'cally a cause fbi- congratulation, 

 for, li(»wever enticiui;' to the investi{]jator tlu' opporl unity of naininj;" 

 "new I'orms'" may he, it is a Ihini; to Ix' avoided wiienevcr possible. 

 AH depart menis of natural science are afllicted with a host of unwar- 

 ranted names, and none more so t han t hat of the 1 >ialomacc;e, where at 

 leastliOpere«Mit of the^enorieand specilic naniesare liclitious. for (liis 

 reason 1 hav«' been compelled to make, in the |»a,u('s Ibllowini^, a num- 

 ber of corrections of familiar names. 



The entire absenceof new species in this ^atheriiii; is an ad<litional 

 conlirmation of the statenuMit that it is entirely the prodiu't of trans- 

 l)orlalion; siiu'e diatoms fouiul {^fowini;- at so unusual a depth woidd 

 ha\(' (pnte certainly sui)plied some hitherto unknown tonus. 



Followinj;' is a list of j;eneia and species fouiul, l(»,u('ther with refer- 

 eiu'es to the drawinj;' and descriptions in i)ublished works by which 

 they wci'C idciit ilied. 

 ActinocycluB ciassua W. S. (Van lIcMrrk's SynopHis. pi. llM, lii^. S. Siiiitli's H. 



1)., i>l. 1, lijr. 11.) Very HCiiicc. 

 Actinocyclus Ralfsii W. S. (Xnn Uourrk's Syiioi).. pi. ll*:i. li;;. (>.) (Vniinimi. 



The tbrms here found are sonu'what internu'diatc between the above 

 and .1. I'jhtvnhvriiH Ilalfs. In fact, these two species .wv known to 

 Hiade into each other by almost indistin«iuishable forms; so that it is 

 l)robable they should constitute oidy varieties of one species. 

 Actinocyclus Ralfsii, \ ai . spaisus (=Eiipodiscus sparsiis, Oiog.). (I'l itcliiird's 



Inl'nsoria. ]). SUf); Mocliiua's I'laios, \t\. I'J, li<x. 171.) Ficqucnt. 

 Actinocyclus subtilis Ixall's. (Van Ilonrck'H Syu., ])1. 124, lij::. 7, pi. 125, li^js. !» and 



11.) Scarce. 

 Actinoptychus hexagonus (liim. (Scliiiiidl'w AtlaM, pi. 1. li-;. l.^.) Nciy scarce. 

 ActinoptychuB splendens Ivalt's. (Nan ihiirck's Syn., \\\. \\\\ li';s. l-l, jil. 120, 



li.i;M. l-ti.) l''rc(iiii'nt . 

 Actinoptychus undulatus I'.lirl). (Sclnuidt's Atlas, pi. 1, (ij;B. l-<i.) Common. 

 Amphipioia oinata Uail. (\ an llt<nrck's Syn., ])1. 22 bis. lijj. h.) ^'cl•y scarce. 

 Amphora bigibba (iron. (Sclimidt's Atlas, jil. 2."), (if^s. 0!>-70.) Scarce. 

 Amphora cingulata CHeve. (Sclimidt's Atlas, pi. 2»i, li}j. 17.) Very scarce. 

 Amphora cymbiffera (ire<r- (Schmidt's Atlas, pi. 2.'). ligs. 17-18.) Scarce. 

 Amphora obtusa (irc<:. (Sclimidt's Alias, pi. 10, litj. l(i.) Scarce. 

 Amphora porcellus KiUnn ( A. novce-calidonife (irnn.). (Sclimidt's .Mias, j)!. 



:>lt. lig. IT). ) Scarce. 

 Amphora proteus (ircg. (Sclimidt's Atlas, jil. 27. lifX->. pl- -•'^. tij;. !>.) I'rc.|iiciit . 

 Amphora sulcata lireli. (rrilchard's Infusoria, p. 88:5; " 'I'lie I.eus. " pi. 2, W'^. 11, 



and )>p. 7r>-7f>. ) Very scarce. 

 Asterionella formosa llassal. i Nan licnrck's Syn.. pi. .M, fif;. 22. ) (nmmon. 

 Asterolampra Marylandica I'.hil). ( M()el)iMs's l'lat(^s, i)l. ;{2, tiics. 1-1.) Scirce. 

 Asteromphalus Brookei Hail. var. (Sclimidfs Atlas, pi. SS. tijx. !•. ) 1 rciniciit. 



Althouiih IMof. II. 1,. Smith's suu.u-cstion, to unite the oemis Astcvom- 

 plidlKS with the former .nenus, is alonu (he liiu' of nnich needed abiidjj:- 

 meutj it yet seems that, as most of th(> genera aie now constituted, 



