4 
THE VOYAGE OF H.M.S. CHALLENGE R. 
shells from the sediments of twenty-one stations most rich in Thecosomata. The results 
of the study of these shells are detailed in this Report under the title of “ Deposit-shells.” 
In the different shell-containing sediments which I have examined, I have found 
twenty-four species of Thecosomata, of which a dozen occur in considerable abundance at 
many of the stations. One of these forms is quite new. The various forms are distri- 
buted as follows in the different genera — 
Genera. 
Species previously known. 
New Species. 
Limacina, ..... 
6 
Peraclis, ..... 
1 
1 
Clio, ...... 
8 
Cuvierina, ..... 
1 
Cavolinia, ..... 
7 
... 
Besides these twenty-four species there are five which do not occur in the Challenger 
collection of preserved Thecosomata. The total number of Pteropoda Thecosomata thus 
amounts to thirty-three, of which one is new, and a number either insufficiently known 
or not previously figured. 
Limacina, ...... 8 
Peraclis, ...... 2 
Clio , . . . . . . .12 
Cuvierina, ...... 1 
Cavolinia, ...... 8 
Cymbulia, ...... 1 
Gleba, ...... 1 
that is, in 7 genera, . . . . . .83 species. 
