70 
MOLLUSCA. 
Turritella. 
which the base is provided with a deep umbilicus, which is 
nearly concealed by the reflection of the columellar lip. 
Found in the Crag at Holywell. 
7. T. cingenda —The Girdled Turritella, pi. XXXVIII. 
fig. 9. 
Turritella cingenda . Sowerby, Min. Conch. V. p. 160, pi. 
499? fig- 3. Phillips, Geo. of Yorkshire, I. p. 129, pi. 11, fig. 
28. Fleming, Brit. An. p. 304. 
Shell subulate; body not a third of the total length; spire 
consisting of about fourteen volutions, with concave sides, and 
each with a crenated girdle upon their lower edges; whole shell 
covered with distinct, but fine, spiral striae, which are closer in 
the middle of each volution; the superior volutions of the spire 
faintly ribbed, but these become obsolete as they descend, until 
they totally disappear; base flat, with a rounded edge, from 
which the girdle emanates that winds around the spire. 
Found in the Shale, Robin Hood’s Bay, near Scarborough; 
and common in the Inferior Oolite. 
8. T. muricata.— -The Prickly Turritella, pi. XXXVIII. 
fig. 6. 
Turritella muricata. Sowerby, Min. Conch. V. p. 159? pi. 
499? fig. 1, 2. Fleming, Brit. An. p. 304. Phillips, Geo. of 
Yorkshire, I. p. 102, pi. 4, fig. 8. 
Shell subulate; body more than a third of its length ; spire 
consisting of ten or eleven rounded, and deeply separated volu¬ 
tions, with their upper edges flattened, terminating in an acute 
apex; whole surface with strong, rough, muricated spiral stria?, 
the spinous murications being most prominent on the edges of 
the volutions, and also provided with longitudinal arcuated ribs; 
base convex, with elevated sharp striae, but destitute of spines. 
Length nearly an inch. 
Found in the Coral Rag, and Shale of Robin Hood’s Bay, 
and also at Steeple Ashton ; Seamar, Malton, and Pickering, 
Yorkshire. 
9. T. abbreviata. — The Shortened Turritella, pi. 
XXXVIII. fig. 13. 
Turritella abbreviata. Sowerby, Min. Conch. VI. p. 125, 
pi. 565, fig. 2. 
Shell very short, conical, acute; body large, occupying nearly 
half the length of the shell; spire consisting of seven volutions, 
each of their edges defined by a large, obscurely granulated 
ridge, and two small close-set ones wind round the centre from 
the base to the apex; the base produced, and provided with a 
single ridge. 
Found in the decomposing Mountain Limestone, Bradley, 
near Newton Bushel, Devonshire. 
10. T. cosTATA_The Ribbed Turritella, pi. XXXVIII. 
fig. 24. 
Shell subulate, much elongated, and acute; body short, occu¬ 
pying about a fourth of the shell; spire abruptly tapering, 
consisting of fifteen or sixteen well divided volutions, at the 
base of each a thread-like, cariuated spiral ridge strongly marks 
the separation of the volutions; whole surface covered with 
longitudinal costa?, which are crossed by numerous fine stria?, 
giving the shell a rough appearance; base flat, with a carinated 
margin. 
Found in the Whetstone pits, Blackdown. 
11. T. excavata. — The Excavated Turritella, pi. 
XXXVIII. fig. 8. 
Turritella excavata. Sowerby, Min. Conch. VI. p. 126, pi. 
565, fig. 5. Cerithium excavatum , Cuvier and Brongniarte, 
Env. de Paris, p. 399? pi. 9? fig. 10. 
Shell subulate, short, smooth; body short, occupying about a 
third of the shell; spire with eleven or twelve volutions, which 
are concave in the centre, with prominent edges both above and 
below; base convex. 
Full grown shells have their lower volutions with a ridge in the 
middle. 
Found in the Limestone at Chilmark, Tisbury, Wiltshire. 
12 . T. granulata. — The Granulated Turritella, pi. 
XXXVIII. fig. 18. 
Turritella granulata. Sowerby, Min. Conch. VI. p. 126, pi. 
565, fig. 1. Cerithium turritellum , Parkinson, Org. Rem. III. 
p. 71. 
Shell subulate, tapering acutely; body occupying more than 
a third of the length of the shell; spire consisting of about 
fourteen slightly inflated volutions, terminating in an acute 
apex, the upper edges of the volutions with a pretty broad, fiat 
spiral band; whole shell covered with spiral stria? and numerous 
nearly regular granules, but with three or four of them some¬ 
what larger than the others. 
bound in the Whetstone pits at Blackdown. 
13. T. Terebra —The Wimble Turritella, pi. XXXVIII. 
fig. 27. 
Turritella Terebra. Lamarck, Hist. Nat. VII. p. 56. 
Sowerby, Min. Conch. VI. p. 126, pi. 565, fig. 3. 
Shell turreted, much elongated; body short, about a third 
the length of the shell; spire consisting of thirteen or fourteen 
venlricose volutions, and terminating in an acute apex; whole 
shell covered with numerous, almost equal, spiral sulci. 
This shell is stronger than the recent species of the same name, 
but differs in no other particular. 
Found in the Suffolk Crag, and has been met with in a clav 
pit at Tottenhill. 
14. T. Piiillipsii.— Phillips’s Turritella, pi. XXXVIII. 
fig. 4. 
Turritella ? Phillips, Geo. of Yorkshire, p. 94, pi. 2, fig. 38. 
Shell subulate, smooth; body occupying about a fifth of the 
entire shell; spire consisting of seven narrow, somewhat ven- 
tricose and deeply divided volutions, terminating in an acute 
apex. 
Found in the Speeton Clay at Speeton. 
15. T. quadrivittata —The Four-banded Turritella, pi. 
XXXVIII. fig. 16. 
Turritella quadrivittata. Phillips, Geo. of Yorkshire. I. p. 
129, pi. 11, fig. 23. 
Shell elongated; body occupying nearly half its length; spire 
consisting of six ventricose, deeply divided volutions, crossed by 
numerous strong, slightly muricated spiral stria?, and terminating 
in an acute apex ; outer lip thin; inner lip slightly reflected on 
the columella. 
bound in the Blue Wick of the Inferior Oolite. 
This shell feels rough to the touch, in consequence of its muri¬ 
cated stria?. 
16. T. tenuistria -The Thin-striated Turritella, pi. 
XXXVIII. fig. 11. 
Turritella tenuistria. Phillips, Geo. of Yorkshire, II. p. 
229? pi. 16, fig. 11. 
