185 
tiiiction can with justice be made on colour variation alone. 
For the time being I enumerate them as varieties. 
Vfii. testudinis. 
Plate xxviii., fig. 2. 
This conies nearest to the described type. The dorsal 
shield is more closely wrinkled, of an earthy-brown colour, 
with more numerous black blotches, in the centre of the crests 
produced by the wrinkles ; each crest does not necessarily 
carry a blotch. 
Shell calcareous, as described in tyjje above. 
Hah. — St. Vincent Gulf : in 25 fathoms. 
Var. pulchra. 
Plate xxviii. ; fig. 3. 
Dorsal shield comparatively smooth : of a rich yellow 
ground-colour, with large, circular, or oval lighter blotches 
surrounded by wreaths of black. 
Shell calcareous, as described in type above. 
Hah. — St. Vincent Gulf ; in 25 fathoms. 
Var. labyrinthina. 
Plate xxviii. ; fig. 4. 
Dorsal shield wrinkled ; of a faint yellowish ground- 
colour, of which very little remains visible on account of a 
labyrinthine structure, produced by closely set, black, partly 
spiral lines, usually more or less concentric to an enclosed 
nucleus in the form of a black dot, into wTiich the innermost 
line very often passes. 
The internal shell in this case is destitute of calcareous 
matter, consisting only of a soft, transparent membrane, with 
the characteristics described in the type above. 
Hah. — St. Vincent Gulf ; in 25 fathoms. 
EXPLANATIONS OF PLATES. 
Plate XXVI. 
Fig. 1. Liuncllaria (n(.sf;(f//.s\ Basedow — Animal; dorsal sur- 
face. 
Fig. 2. Lamellaria australis — Animal: ventral surface. 
Plate XXVII. 
Figs. 1, 2, and 3. LameUdi'ia ausfralis. Basedow — Internal 
shell, various aspects. 
Fig. 4. LameUaria ausfralis, Basedow — Showing position of 
internal shell with respect to animal. 
Fig. 5. Lamellaria ausfralis. Basedow — A lateral tooth. 
Fig. 6. Lamellaria ausfralis. Basedow — Dentition 1:1:1. A 
single row of teeth, unfolded. 
