364 PROF. EHRENBERG ON ANIMALS OF THE CHALK 
59. Triceratium striolatum, P\. VIII. fig. 9. T. testule lateribus trique- 
tris convexis, angulis subacutis, superficie subtilissime punctato-li- 
neata, dorso cingulo medio levi. 
Recent near Cuxhaven. Size ,'”. 
60. Tripodiscus Argus, Pl. VII. fig. 6. T. testule magne orbicularis 
compress valvulis leviter convexis, cellularum in series radiantes 
dispositarum margine, interdum et interstitiis, punctatis asperis, pro- 
cessibus lateralibus brevibus hyalinis. 
Recent near Cuxhaven. Diameter ),"’. 
61. Zygoceros Rhombus, Pl. VIII. fig. 11. Z. major, testula turgida a 
latere rhomboide angulis rotundatis, superficie subtilissime striata et 
granulosa, dorsi angulo medio levi. 
Recent near Cuxhaven. Diameter 7;'". 
62. Zygoceros Surirella, Pl. VII. fig. 12. Z. minor, testula compres- 
siore a latere lanceolata, apicibus constrictis obtusis, superficiei 
lineis granulatis in medio conniventibus magis distinctis, dorsi cin- 
gulo levi latiore. 
Recent near Cuxhaven. Size 75/". 
XI. Summary of Results considered with relation to the present 
state of our knowledge. 
It should be the endeavour of one who has collected new facts 
not merely to bring them accurately and clearly under review, 
and to compare them according to his own idea of them with 
the existing state of science, but also to elucidate the conclu- 
sions which directly and necessarily result from them. This 
additional task is generally very difficult, sometimes leading to 
the discovery that what had been supposed new was not so, or 
not of sufficient importance for such an extended investigation ; 
sometimes rendering a fresh and more profound examination 
requisite, or misleading to an evident exaggeration of the facts 
discovered and to conclusions which they do not justify, and is 
therefore very frequently avoided from motives of fear or con- 
venience. To leave this to others lightens indeed the labour of 
the task ; but this alleviation at the same time lessens the value 
of isolated observations, and throws a doubt upon the care em- 
ployed in making the comparison. 
Along with the general view of the facts advanced, I have also 
aimed at forming comparisons and conclusions, not in order to 
veil any erroneous view of the facts, but to render it the more 
conspicuous where it had gained ground; and on the other — 
hand to render the truth discovered more striking, and thus 
