18 NILS HJ. ODHNER, MOLLUSCA. 
Septifer bilocularis LINNÉ, var. 45 miles W. S. W., 80 feet (?”/s), 1 sp., 1. 25.5 
mm; 60—72 feet, many sps, max. 1. 45 mm; 48 feet (/1), 4 sps, max. 1. 40 mm; 
42 miles W. S. W., 70 feet ("”/s), many sps, max. 1. 35 mm. The shells (fig. 2) are 
red and green in colour, like Mytilus nicobaricus or M. kraussi of REEVE (Conch. 
Icon. 10, figs. 42 and 40); the colours may be more or less marbled. 
With respect to the great polymorphism of the Septifer bilocularis series, I 
hold it to be of great scientific import to state which of the forms included in the 
species may be the typical one. The original specimen of LInnÉ had not been 
hitherto identified with certainty. As it belonged to the Museum Ludovicae Ulricae, 
I hoped to find it in the collections of Linnean conchylia at Uppsala. Through the 
kindness of Professor A. WIRrRÉN, I am able to give a description and some figures 
of, as it seems, LINNÉ's original specimen of this species (fig. 1). Professor WIRÉN 
Fig. 1. Septifer bilocularig LINNÉ. LINNÉ'S original of Fig. 2. Septijer bilocularis LINNÉ var. Cape Jaubert, Australia. 
Mytilus bilocularis, Syst. Nat. X, p. 705. a right, b left a right, b left valve, c another left valve; slightly enlarged. 
valve; slightly enlarged; c umbonal parts with septa 
and hinges, X 2. 
communicates the following remarks on the shell: >»On account of the defective label- 
ling in earlier times it is not absolutely certain that the specimen is the same as 
that described by LINNÉ. The labels originate from THUNBERG, the printed one from 
a later time. LINNÉ mentions that his M. bilocwlaris is to befound in M(useum) L(u- 
dovicae) U(lricae). This museum was inherited by King Gustaf IV Adolf and was 
presented by him to Uppsala, for which reason it is designated »Mus. Gust. Ad.» on 
the labels of THUNBERG. It can be shown that this collection was added to and altered 
during the period between LInNf's examination of it and its presentation to Upp- 
sala; however, as only one specimen of M. bilocularis exists, it is, of course, very 
probable that this is really the one described by LINNÉ. It agrees with the descrip- 
tion and is, like many others of the royal conchylia, carefully polished.> 
The specimen (fig. 1), both valves of which are quite entire — only the ligament 
has been removed — has a total length of 33 mm at a height from dorsal to ventral 
margin of 21 and a crassitude of 16.5 mm. Its outline is somewhat quadrangular, 
due to the high dorsal margin. "The colour of its anterior and ventral part is, as 
