108 



Antero - posterior diameter, 57 ; umbo-ventral diatu., 48 ; 

 sectional diam., 32 mm. 



This species differs from C. Hallii by its regularly convex 

 dorsal margin and its wide concentric ridges. 



Gari? sp. 



The collection contains a single example of a member of the 

 family Psammobiidse, as inferred fram its shape and the presence 

 of a ligamental plate, but as the antero-dorsal area is wanting the 

 generic location cannot be fixed. Left valve very flattened, the 

 ventral margin nearly straight, somewhat pointed posteriorly. 



Antero-posterior diameter, 50 ; dorso -ventral diam., 25 mm. 



It does not agree with any described recent species of the 

 family, though it approaches to Solenotellina siliqua, Reeve, 

 inhabiting New Zealand. 



MytilUS, sp. (aff. M. planulatus). 



Shell elongately oval, solid, somewhat angularly attenuated 

 towards the umbo, which is bent downwards, transversely 

 moderately convex. (Smooth with low concentric growth-folds.) 

 Anterior margin straight, dorsal margin uninterruptly arched, 

 ventral margin, 



Length (incomplete), 95 mm.; greatest width medially, 65 mm. 

 (One imperfect valve, much decorticated). 



This fossil is distinct from M. planulatus, Lamarck, and M. 

 latus, Chemnitz, by^its uniformly curved dorsal margin ; being 

 unable to make a comparative study with M. chorus, I avoid 

 applying a distinctive denomination. 



MytilUS, sp. (aff. M. Magellanicus). 

 A mould of a radially sculptured mussel is suggestive of M. 

 Magellanicus, but the fine regular radiating ridges indicate some 

 other reference. 



EXPLANATIONS TO PLATES. 

 Plate II. 



Fig. 



1. Chione permagna. Nat. size. 



2. Chione KergutUni. Nat. size. 



3. Turritella Hallii. a, Nat. size ; b, sectional portion of a whorl, enlarged. 



4. Natica Tremarici. Sectional three views, slightly enlarged — a, from 



above ; b, frontal side ; c, base. 



5. Chione Hallii. Nat. size. 



Plate III. 



Oat's Ears, looking south-east from Long Island, near entrance to Royal 

 Sound. (A sketch by Mr. R. Hall, 4-1-98). 



1. Cat's Ears. 



2. Fossil bed. 



3. Heavy masses of rock. 



4. Lava much contracted and distorted. 



