KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 52. N:o [6. 
~I 
A. Marine Mollusea. 
1. Mollusea from the shores of Broome. 
Pinna bicolor Curmnirz, var. A great many specimens of this species were 
taken on the muddy shores of Broome, the largest one measuring 22 cm in length. 
The colouration, consisting of dark radiating stripes, corresponds to that of the typical 
P. bicolor (figured by Reeve, Conch. Icon. 11, fig. 17) but the shape differs in its 
straighter, obtusely truncated and not slowly curving posterior margin. The specim- 
ens are like some from Madagascar collected by Dr. KaupmRN; an especially char- 
acteristic feature are the sinuous squamular scars, which give the longitudinal ribs 
an imbricate appearance. Traces thereof, together with distinct squames, are present 
in the typical P. bicolor, judging from specimens in the Swedish State Museum. 
The Australian form is only somewhat darker than that from Madagascar and shows 
confluent rays, especially on the inner shell surface; at the posterior margin there 
is, however, a lighter zone, where they appear clearly. 
P. nigra Cuemnitz, | shell of 29 cm, interiorly dark brown with the mu- 
scular scar causing a curving-out of the pallial line, exteriorly with obscure broad 
longitudinal ridges, with dense squamular scars, 
P. chemnitzi Hanury, 1 sh., 1. 206 mm. 
Ostrea hyotis Linnr, 1 sh., diam. (breadth) 17 em. 
0. imbricata Lamarck, 1 sh., diam. (breadth) 12 cm. 
On these Osirea shells there were attached several mollusca, such as Seplifer, 
Chama, Sigaretus. 
0. inermis SowrRBy, some worn shells, max. |. 62 mm. 
0. ordensis Savirte-Kentr. Broome, on twigs of White Mangrove (Avi- 
cennia officinalis), many sps, max. l. about 15 mm. This small-sized form was 
discovered by Savitte-Kent in Cambridge Gulf and briefly mentioned by him in 
1889 (Proc. Roy. Soc. Queensland, 6, p. 224—5). He described it in 1891 and later 
