Plate XIII.
Fig.
1. Pecten limaeformis Morris, p. 94. 277.
2, 3. Pterinea macroptera Morris, p. 96. 276.
4. Orthonota ? compressa Morris, p. 96. 274.
Plate XIV.
1. Pecten squamuliferus Morris, p. 96. 278.
2. ——— Fittoni Morris, p. 96. 277.
3. ——— Illavarensis Morris, p. 91. 277.
4a. b. c. Productus brachythaerus G. Sow., p. 87. 91. 94. 284.
The figures illustrate the external surface and the internal structure of the dorsal and ventral valves.
Plate XV.
1. 1a. Spirifer Stokesii König, p. 283.
2. Spirifer (Terebratula?) crebristria Morris, p. 88. 279.
3. ——— Tasmaniensis Morris, 280.
1. Variety of the same, with unequal costæ ; from Mr. Darwin's
collection.
5. Spirifer subradiatus G. Sow., p. 94. 281.
This is presumed to be the species described by Mr. G. Sowerby
(the original specimen not having been examined); it is a very
variable species, and attains considerable size ; the figures on
Plate XVI. are considered to be varieties of the same species,
intermediate forms having been observed between specimens
having " indistinct costæ" and those destitute of them.
Plate XVI.
1. Spirifer subradiatus, from Illawara, p. 89. 96. 281.
2. A siliceous cast, from Van Diemen's Land, showing the spiral
lamellae, one of which is distorted from the natural position.
3. Internal cast of ventral valve.
4. Internal cast of dorsal valve.
Plate XVII.
1. Spirifer vespertilio, G. Sow., p. 97. 282.
2. A siliceous cast of the same, with the spiral lamellæ visible
along the hinge-line.
3. A short variety of the same, showing the cast of the imbricated
costæ. This specimen is much compressed.
4, 5. Terebratula cymbaformis Morris, p. 87. 278.
6. Spirifer avicula G. Sow., showing the divided ribs towards the
margin, p. 97. 282.
