BIHAXG TILL K. SV. VET.-AKAD. HANDL. BAND 13. AFD. IV. N:0 O. 21 



II. Conchse. 



Pecten. Name from Plinius and aiict. Kept up in the 

 notes and iu tlie Hanley ^IS, afterwards inchided in the 

 following. Twenty two spccics, for tlie most part in the M. 

 L. U. ^ 



OsTREUM. Thus writtcn iu the notes and the Hanley MS. 

 Eleven species: now of Piacuna, ^leleagrina, Avicula, Ostrea, 

 Chama (lazarus), Mallens. 



AiJCA. The only genus among the Coneh^e of which the 

 species are marked with numbers in the pencil-notes. Six 

 species, Area and Pectunculus, beginning as elsewhere with 

 1. A. tortuosa. 



Phola«. Name in eommon with the pencil-notes and the 

 Hanley MS. The eharacters of the genus are given thus: 

 »Testa lenticularis (like a convex microscopic lens), orbiculata. 

 The rima looks as if cut witli a knife; at the anus it has an 

 impression of a fignra eordata. Tlie shell is thick.» 



; 1. Phulas siilco antiee lougiliuliiiaJi. Akgknv. t. 24, f. N. Is 

 found at Jamaica. Pennsylvania. KAL>i.> This is the Venus pensyl- 

 vanica, 114, S. N. ed. 10; 67, M. L. U.; 138, S. N. ed. 12; Lu- 

 cina pennsylvanica Lamck. Hanley remarks: »the oharacter, in the 

 M. L. U., xintus versns marginem violacens» was, I snspect, intended 

 for punctata on the opposite page». It is probably a mistake of 

 tlie copyist. 



:>2. Pectinata, Rumph. t. 43 ') f. B. Pholas longitudinaliter 

 striata. Internallv it is lino<l witli a thick bark, which is whi- 



as Bartholin and Kkdi.j AVith regard to Redi he soou recognised his 

 error, and in 1754. in the Museum Adolphi Frlderici, p. 96, describes 

 an Ascidia under the name of Microcosnius gelatinosus. In the tenth 

 edition of S. N., 1758, it has, however, disappeared. In the Lectures of 

 1765, speaking of Helix (Planorbis) spirorbis, he says: >the larva of the 

 Phryganea makes use of this shell in bullding its house. The ancient 

 authors speak of an animal called Krake, which stånds in the S. N. ed. 6 

 as Microcosmus. People who believe they have seen it say that it re- 

 sembles a floating island and that its test is composed of stones, shells 

 etc. If it really exists, it may be soniething in the Phryganea way.» 



') In the editio princeps of the Raritelten-Kammer, of 1705, every 

 plate bears, at the top, to the left, the nnmber of the page in front of 

 which it is to be placed, and to the right the ordinal number of the 

 plate itself. At the bottom nothing is seen except here and there the 

 engraver's signature. Two of the plates had been wrongly numbered by 

 the engraver. When that numbered XLIII is placed according to the 

 direction, in front of page 138, to which it refers, it happens to precede 

 the one beariug the number XLII, the place of which is indicated to be 

 iu front of page 140. Now, in the Drottningholm copy this error had 



