18 DEPARTMENT OF THE NAVAL SERVICE 
7 GEORGE V, A. 1917 
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Fig. 6. 
Drawing of lobster larva, twelve days old, carefully 
shaded from the fourth to the twelfth day. 
These larvae moulted on the ninth day, and 
show the swimmerets and the serrations on the 
beak which are the marks of the second phase. 
6. DIATOMS FOUND IN THE REARING Boxes. 
While Licmophora was by far the most plentiful diatom on the lobster larve 
in 1915, other kinds were present in the rearing boxes, and occasionally on the larva. 
A few ribbons of Fragillaria, probably hyalina (Kutz) Grun., were found with the 
Inicmophora, adhering to the bristly appendages of the larve. Others collected from 
the stirring paddle or from the bottom are named below, plentiful in about the order 
of arrangement :— 
Amphora coffaeformis (Ag.) Kutz. 
Cocconeis scutellum Ehr. 
Paralia sulcata Ehr. 
Rhabdonema adriaticum Kutz. 
Nitzschia longissima (Breb.) Ralf. var. parva, Van H. 
Navicula (Stauroneis) spicula Hickie. 
Melosira nummuloides (Bory) Ag. 
Grammatophora marina (Lyng) Kutz. 
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