. Papers and proceedings of the Royal Society of Tasmania. the shell. Beak, in young exampleswith faintly, in older ones distinctly, developed plates in the illustrated example touching eachother. In the largest example (from which fig. 9 isderived) they are separated, which possibly results fromabsorption in the dead shell. The Brachial apparatus isnot completely preserved in any of the examples (onlyempty shells are displayed), yet they show, aa we can con-clude from the remnants, the characters of Terehratelladorsata (fio-. 9). There is a bigh median-septum developed,which i
. Papers and proceedings of the Royal Society of Tasmania. the shell. Beak, in young exampleswith faintly, in older ones distinctly, developed plates in the illustrated example touching eachother. In the largest example (from which fig. 9 isderived) they are separated, which possibly results fromabsorption in the dead shell. The Brachial apparatus isnot completely preserved in any of the examples (onlyempty shells are displayed), yet they show, aa we can con-clude from the remnants, the characters of Terehratelladorsata (fio-. 9). There is a bigh median-septum developed,which is connected at the back with the hingeplate. Atthe point where the connection of the descending limbreaches the septum, this subsides, curving gently towardsthe front, to end rather far in front of the middle of theYalve. The described general characters of the shell would,apart from its small size, hardly suffice to permit a defi-?iite distinction of the jtresent species from 1\ , the characters of the pores provide Terehratella mayi—outev surface of the middle part ofthe dorsal valve (10(3 x, 9 sq. mm.) The nunaber of pores in the sq. nun. amount to 300 (inT. dm-saia, 180-212). Th<! inner diameter of the shelltubes is U)fi., and the outer oval opening of the samemeasures 60/35^. BY F. BLOCHMANN. 115 1913. Dimensions in miUimet)t»s. Largest example. Example figs. 8,9. Length 12-0 10-5 Breadth 11 0 ... 93 Thickness ... 60 5-5 Habitat, off Cape Pillar, Tasmania, at a depth of 180 ;100 fathoms). 3. Argykotheca (Cistella) Mayi, d. s}-. (Phite xi., fig. 10, 11.)Outline, nearly rectangular, broadened more or less to--v^rards the front, so that the outline is nearly front edge is slightly indented. Both valves have aslight median-sinus. Hinge line nearly straight. Dorsal-valve is perforated. Beak very short and broad; beak•edges sharp. Adjoining these towards the middle is a flat^rea. Stem hole very wide, bordered on
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Keywords: ., bookcentury1800, bookdecade1860, bookidpapersprocee, bookyear1863
