234 Miscellaneous. 
Mactra subtruncata, Da Costa. | Donax anatinus, Lam. 
solida, Linn. Syndosmya alba, Wood. 
Lutraria elliptica, Lam. prismatica, Mont. 
oblonga, Chem. | Ceratisolen Legumen, Linn. 
Tellina donacina, Linn. | Solen Siliqua, Linn. 
incarnata, Linn. Ensis, Linn. 
tenuis, Da Costa. _—— marginatus, Pulteney. 
crassa, Pennant. pellucidus, Pennant. 
fabula, Gronovius. |Corbula nucleus, Lam. 
pygmeea, Phil. Saxicava arctica, Linn. 
Psammobia tellinella, Lam. Thracia phaseolina, Lam. 
Ferroensis, Chem. | Pandora obtusa, Leach. 
Number of Species :—Cephalopoda...... 2 
Gasteropoda...... 78 
Lamellibranchiata. 72 
Total’ s-a0b2 
The part explored was very limited in extent and range of depth, 
nowhere exceeding 15 to 16 fathoms, which accounts for so many 
fewer species being obtained than in Vigo Bay. Had our researches 
extended to the inlet forming the harbour of Ferrol, it is probable 
that we should have been much more successful. 
Of the species enumerated, only fifteen species of Gasteropoda 
and four of Lamellibranchiata are not known inhabitants of the 
British seas, including the Channel Islands. 
The genera Ringicula, Mitra, Solarium, Solemya, and the species 
Cyprea candidula, Scalaria crenata, Dentalium dentale, Auricula 
Firminii, Chiton fulvus, Cardium ciliare, and Lucina digitalis are 
supposed to reach the northern limit of their range in the neighbour- 
hood of Corunna, and are not found further east in Asturias. 
The genus Cassis and species Murex Edwardsui, Purpura hema- 
stoma, Mangelia elegans, and Lucina pecten have been obtained on 
the coast of Asturias, and find their respective limits northward on 
the Spanish or French shores of the Bay of Biscay. 
Lacuna puteolus is the only northern form which reaches its 
southern limit of range in the neighbourhood of Corunna. 
Of the most characteristic forms in Vigo Bay—viz. Chiton fulvus, 
Ringicula auriculata, Turritella triplicata, Nassa trifasciata, Fusus 
contrarius, and Mactra rugosa—only the first two were obtained at 
Corunna. 
On Arachnactis brachiolata, a Natatory Actinia, discovered near 
Nahant, Massachusetts. By ALEXANDER AGASSIZ. 
The Zoophyte described by Mr. A. Agassiz is a near relative of 
the Arachnactis described by Sars in his ‘ Fauna Littoralis Norvegie.’ 
Mr. Agassiz insists particularly upon the bilateral structure of this 
type, which is nearly as striking as that of Philomedusa and Hal- 
campa. The mouth is excentric, and elongated into a fissure. The 
