173 Dr. G. Lawson on Lepas anatifera. 



EXPLANATION OF PLATES. 

 Plate VL 



Fig. 1. Praniza Edwardsii : I c/, maxilliped ; 1 k, gnathopod, 



Fiff. 2. Larva of ditto. 



Fig. 3. Ditto, older, of C(Bruleata7 



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

 4/, maxilla; 4(7, maxilliped; 4 /«, gnathopod. 



Fig. 5. Ce})halon and ap])endages (dorsal surface): b, superior antenna; 

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

 enlarged. 



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

 tenna (inferior). 



Fig. 7- Ce])ha]on and appendages (ventral aspect) : a, eye ; d, mandible 

 (turned bade); 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 j^ereion. 



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



Fig. 10. Nervous system. 



Plate VIL 



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

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

 maxillarin and Praniza cceruleata respectively.] 



Fig. 1. Anceus maxiUar is. 



Fig. 2. Cephalon, lateral view. 



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



mandibles ; h, gnathopod ; 3 g, maxilli])ed ; 3 h, gnathopod ; 



h", cilia enlarged. 

 Fig. 4. Ventral aspect of body of Praniza. 

 Fig. 5. Ditto of Anceus. 

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

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

 Fig. H. 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 Uth 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, co))ij)letehj covered throughout its entire lower surface with 

 a dense crtjp of barnacles. 



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

 supply of specimens for examination. The species is Lepas 



