172 Dr. G. Lawson on Lepas anatifera. 



EXPLANATION OF PLATES. 

 Plate VI. 



Fig. 1. Praniza Edwardsii : I g, maxilliped; 1 h, gnathopod. 



Fig. 2. Larva of ditto. 



Fig. 3. Ditto, older, of cceruleatal 



Fig. 4. Praniza cceruleata : 4 b, upper antenna; 4 c, lower ditto; 

 4/, maxilla; 4 g, maxilliped ; 4 h, gnathopod. 



Fig. 5. Cephalon and appendages (dorsal surface) : b, superior antenna ; 

 c, inferior ditto ; d' 1 , labium ; h, gnathopod ; 5 a, part of the eye 

 enlarged. 



Fig. 6. Labium enlarged (from below) : d", siphon ; d, mandible ; b, an- 

 tenna (inferior). 



Fig. 7 - Cephalon and appendages (ventral aspect) : «, eye ; d, mandible 

 (turned back) ; d", labium and siphon ; e,f, maxillae ; g, maxilli- 

 ped ; h, gnathopod. 



Fig. 7 d". Ditto, lateral view. 



Fig. 8. Lateral view of head and anterior part of pereion. 



Fig. 9. Ditto of pleon and posterior part of pereion. 



Fig. 10. Nervous system. 



Plate VII. 



[The four lines at the top of Plate VII. represent the natural sizes of 

 the larva at the time of being hatched, and a little later, of Anceus 

 maxillaris and Praniza cceruleata respectively.] 



Fig. 1. Anceus maxillaris. 



Fig. 2. Cephalon, lateral view. 



Fig. 3. Ditto, seen from below : b, upper antenna ; c, lower ditto ; d, d, 



mandibles ; h, gnathopod ; 3 g, maxilliped ; 3 h, gnathopod ; 



h", cilia enlarged. 

 Fig. 4. Ventral aspect of body of Praniza. 

 Fig. 5. Ditto of Anceus. 

 Fig. 6. Ova of Praniza (early stage). 

 Fig. 7 • Pereion of Praniza with ova : 7", ova of same. 

 Fig. 8. Pereion of Praniza with ova; 8", ova of same. 



Plymouth, July 20, 1858. 



XVII. — Remarks on Lepas anatifera, Linn. 

 By George Lawson, Ph.D. 



On the 9th July, 1858, while the steam-ship 'Dundalk' was 

 passing through Banff Bay, on her passage from Inverness to 

 Granton, the attention of the crew and passengers was attracted 

 by a remarkable object floating in the water, which was at first 

 supposed to be a huge fish. A closer examination proved it to 

 be a squared log of fir timber, somewhere about thirty feet in 

 length, completely covered throughout its entire lower surface with 

 a dense crop of barnacles. 



The log was brought to Granton Pier, whence I obtained a 

 supply of specimens for examination. The species is Lepas 



