ORDER I. SESSILES. 19 



Example. 

 PI. V. Fig. 1 to 1 1 . 



Octomeris angulosa, Sowerby, Zool. Journ., vol. ii. p. 244 ; Supp. 



pi. 12. 

 Octomeris Stuchburii, Gray- 



CONIA, Ranzani. 



Testa conica, valvis quatuor porosis insequalibus lateraliter ferruminatis 

 composita ; apice pervio, basi valva testacea clausa. Operculum 

 valvis quatuor compositum, pari postico prominulo. 



The species which have been associated under the title of Conia were 

 separated from the Balani by Ranzani, in which arrangement he was 

 followed by Dr. Leach in the ' Supplement to the Encyclopedia Britan- 

 nica.' Their shell is composed of four pieces only, so closely cemented 

 together, that the divisions are scarcely discernible ; and they are cha- 

 racterized by being more or less perforated with numerous cellular pores. 

 The operculum is the same as in the shell of Balanus, and, as in that 

 genus, the base is testaceous, flat and irregular, according to its acci- 

 dental position of growth. 



Examples. 



PI. VI. Fig. 1,2,3. 



Conia porosa, Leach, Enc. Brit. Supp. 

 Lepas porosus, Linnaeus. 

 Balanus stalactiferus , Lamarck. 



PI. VI. Fig. 4 and 5. 



Conia Lyonsii, Leach, MSS. Brit. Mus. 

 Lepas Lyonsii, Wood. 



