What are the (correct) terms for these flagella-arrangements?
A good source on this subject is Tortora's Microbiology. Unfortunately, it uses a different terminology.
Have a look at this image (click on it for a bigger size), chapter 4, page 81:

As you can see, the lophotrichous arrangement is the one with the flagella at one end of the bacterium (which agrees with the arrangement at the Wikipedia page).
However, the opposite arrangement (flagella at both ends) is called amphitrichous (which, by the way, makes more sense), not cephalotrichous.
The text below that image says:

Lophotrichous: a tuft of flagella coming from one pole;
Amphitrichous: flagella at both poles of the cell;

If you assume that &quot;amphitrichous&quot; is synonym of &quot;cephalotrichous&quot;, then the correct book would be your second one, which says:

A - Lophotrichous (tuft of flagella on one end)
B - Cephalotrichous (tufts of flagella on both ends)

However, there is no evidence that one should consider &quot;amphitrichous&quot; and &quot;cephalotrichous&quot; as synonyms. Besides that, things seem to be way more complicated: if you search those terms at Google Books, you'll see that most books say that amphitrichous bacteria have only two flagella, one at each end. And, indeed, some have completely opposite definitions.

Source: Tortora, G., Funke, B. and Case, C. (2010). Microbiology. San Francisco, California: Pearson Benjamin Cummings.