490 Cc. A. NILSSON-CANTELL 
Complementary description: This litoral species — one of the largest 
known balanids — is represented in the material by a single small specimen. 
This young individual was situated on a floating specimen of L. anatifera with 
the base on both umbones of the scuta. As regards the external characters 
the species is well known. This little individual has a conical, rather elongated 
shell. It is pale pink coloured. 

Fig. 3. Balanus psittacus (Molina). 
a labrum; 4 mandible; ¢ maxilla 1; @ maxilla IL. 
The ofercular plates are very typical. Without studying them it was 
not possible to determine this individual only from the shell, as it is not 
fullgrown. 
The scutum has on the inside the very typical cavity at the basitergal 
corner. 
The ¢ergum is narrow, with a beak, not so long as in the fullgrown spe- 
cimens. Inside there are no crests as is stated in the originally description. 
