A/ 
330 GINGLYMACONCHA. PINNADZ. 
Pinna pectinata, Dill. Desc. Cat. 326; Lam. Hist. Nat. des 
Anim. sans Vert. vi. part. i. 133, var. 3. 
This species inhabits the Atlantic, the western coasts of De- 
von, the southern coasts of Ireland, and the northern coasts of 
Scotland in deep water. It varies in having the ribs spiny ; 
the processes or spines erect, anteriorly excavated or hollowed ; 
or with having the ribs nearly obsolete, simple, and without 
spines: it is most common in the Salcombe Estuary. Mr. 
J. Cranch, when in a trawl-boat near the Eddystone lighthouse 
in the Plymouth Sonnd, found the specimen described above, 
measuring 13 inches long, and 8 in height anteriorly, which 
contained several muddy pearls. In this species I have fre- 
quently seen the Pinnoteres Veterum™, mentioned by Apuleius, 
and in the fable so beautifully told = Oppian, which is also 
alluded to by Ciceroy. Aristotle supposed that they acted 
as sentinels, which was also believed by Rondeletius and other 
naturalists. 
2. PINNA ELEGANS. 
Shells with their valves slender, thin, transparent, longitudi- 
nally ribbed; the ribs narrow, very numerous, placed very 
near to each other, gradually attenuated behind and spiny ; 
the spines concave; the anterior margin nearly equal; the 
epidermis pale horn-coloured, behind purple, inclinmg to blue 
or greenish. Length seven inches; height anteriorly three 
and a quarter inches. 
Pinna ingens, Penn. Brit. Zool. iv. 115. 
Pinna pectinata, Da Costa, Brit. Conch, 240. t. xvi. f. 3; Pult. 
Cat. Dorset. 39. t. iil. f. 3; Mont. Test. Brit. 178; M. & 
R. Trans. Linn. Soc. viii. 113; Turt. Conch. Dict. 148. 
* Described in my ‘ Malacostrata Podophthalmata Britannica,’ article 
Pinnoteres, where all the British species yet discovered are described and 
figured. 
+ “ Pinna vero (sic enim Greece dicitur) duabus grandis patula conchis, 
cum parva squilla quasi societatem coit comparandi cibi. Itaque cum 
pisculi parvi in concham hiantem innataverint, tum admonita a squilla, 
pinna morsu comprimit conchas.””—Cicero de Nat. Deor. lib. ii. s. 48. 
