﻿46 MR. F. W. 0. RYMER JONES ON SOME JAA'AN DEEP-SEA LAGEN^E. 



the Miliohe *, including Biloculina, QmnquelocitUna, TbHIocnUna, and otlier varieties are 

 not uncommon. In tliis sounding I have also met with a few very perfect Rotaline 

 " casts," probably of Operculina, 



The T olij cy stin(B are also abundantly represented by many very beautiful forms, some 

 of which I belieye are new to science. 



The DiatomacecBy too, are very numerous, and are well represented by Coscinodism 

 Oampylodiscus cli/peus, Amphiteiras ornately Asteromphahis eleyonSy Cerataulus turgidus 

 and Triceratmm famis , Ehr., the last of which is rather rare, though the quadrilateral 

 form of this species is very common. 



The "tests" of Foraminifera are plentifully met with, and present great variety of 

 shape and texture, some being merely an agglomeration of irregular coarse sand grains ; 

 while others are composed of smooth, stmight sponge-spicules, sometimes loosely inter- 

 woven, or compactly and longitudinally arranged; and those of a third variety are 

 formed by a very translucent exudation from the contained living body, which is 



strengthened in parts or all over by small sponge-spicules, sand grains, and mmute 

 shells of Botalia. 



The valves of Ostracoda appear in considerable abundance ; amongst which are those 



of Cytliere clathmta, Eeuss, Bairdia amygdaloldeSy CytJierideis maculatay CytJiereis 

 lacerata, Eeterodesmiis Adamsii, Brady, and many other varieties. 



The spicules of Sponges which are met with so profusely in the " Spongitenkalk " 

 of Germany, and in the Upper Greensand and Oolitic and Carboniferous Limestones of 

 our own country, are also abundantly present in these seas, and form an important item 

 m the sedimentary deposits of the present deep-sea bed. Their forms are very varied 



and beautiful, presenting so many diversities of shape that the study of these alone is 

 full of mterest. ^ 



The spmes of Echini also are not by any means uncommon, many of them being very 

 elaborate and perfect. 



The LacjencBy which are now under consideration, are tolerably abundant and weU 

 aeveioped m this sounding, though as a rule they are very small. The largest forms 

 i nave met with measure about ^ of an inch long by -^ of an inch wide, the 



wUh an 1? }Tt. ^^' ^'* ^^^ P^^f^^* Entosolenian forms (those provided 

 Tl ZTtr\ " "'""*^ '"^^ *^^i^ ^^^^^ measured no more than ^ of an 



aUowinAo/.I^ ^''. '''''^ ^'^^^- ^^^^^g' therefore, a rough calculation, and 

 ^ol^kll^^^^^ f the shelWaUs, which a great majority of them u. 



these miLZ : C?^^;^^^^^^ T ' ""^^" "^"^^^^ ^^ ^ ^^^^^^ ^^^ ^ ^^"'^I ' 

 about 58 000 t n . i • , "'' ^'^^'"''^^ ^^ the Paris basin is estimated to contain 



or,^ni.!:'i;ZZ'"A '"' ""'^^^^^^^ ^^^^-ted the number of these minute 

 Such an array^, ru ^^^^^ ^^ ^^ ^-m the Antilles at upwards of 3f mihion. 



y n^ures even for one cubic mch of this mud passes far beyond our 



« 



with vmiTio. .^ ' , i'-^'-ci-taueuus, arenaceous, and vitr 



wiin young Bpecimens the shell-wAlk nf x^t.- v 



»ueu wans ot which are as transparent 



vitreous 



itisbyn^ 



n 



J 



