80 MOLLUSCA 



Genus XXX\I.—ClRRVS.—Sowerbi/. 



Spiral; conical; with a hollow, funnel-shaped axis; 

 volutions contiguous, numerous, rounded, or slightly 

 angulated. 



The shells of this genus nearly resemble those of 

 Trochus, but may be distinguished by their funnel- 

 shaped umbilicus. 



1 . C. NODOSUS.— The Knotty Cirrus, pi. XLI. fig. 9 and 2 1 . 

 Cirrus nodosus. Sowerby, Min. Conch. III. p. 35, pi. 219, 



fig. 1 and 4. lb., II. p. 94, pi. 141, fig. 2, a cast. Fleming, 

 Brit. An. p. 313. 



Shell conical, rugose, reversed, acuminated ; body large, dis- 

 coidal, in diameter, occupying not quite a third of the entire 

 length of the shell ; spire acutely conical, consisting of ten or 

 eleven flat-sided volutions, separated by a narrow suture, with 

 two rows of lengthened tubercles, and crossed by many small 

 carinas ; body with four series of spiral, undulous carinae, which 

 are crossed by numerous lengthened tubercles; between the 

 transverse carinse are fine, regular, elevated striae, which are 

 very conspicuous on the lower portion of each volution. 



Found in the Inferior Oolite, Dundry. 



Fig. 21 is a cast of the shell. 



2. C. Leachii Leach's Cirrus, pi. XLI. fig. 19. 



Cirrus Leachii. Sowerby, Min. Conch. III. p. 36, pi. 219, 



fig. 3. Fleming, Brit. An. p. 313. 



Conical; with numerous longitudinally striated volutions, pro- 

 vided with several rows of tubercles, crossed by numerous small 

 carinje ; the superior row of tubercles on the body volution 

 ci'owned with slightly arcuated, strong compressed spines. 



Found in the Lower Oolite at Dundry. 



3. C. TURBANOIDES. — The Turbanated Cirrus, pi. XLI. 

 fig. 24. 



Cirrus nodosus, var. Sowerby, Min. Conch. III. p. 35, pi. 

 219, fig. 2. 



Shell reversed ; with the body volution discoidal, above which 

 the spire rises into a flattened cone; the four or five superior 

 volutions abruptly conical, and terminating in a rather acute 

 apex ; the whole surface covered with divergent ribs, which do 

 not, however, extend to the four or five superior volutions ; 

 aperture subovate. 



Found in the Lower Oolite at Dundry. 



4. C. PENTAGONALis — The Pentagonal Cirrus, pi. XLI. 

 fig. 16. 



Cir7-us pentagonalis. Phillips, Geo. of Yorkshire, II. p. 

 226, pi. 13, fig. 8. 



Shell conical, obtuse; body large; spire short, with subpenta- 

 gonal volutions ; base flattish, with an acute margin ; umbilicus 

 large, deep, with an acute margin ; aperture subovate, trans- 

 verse, descending ; outer lip thin ; inner lip reflected on the 

 columella, but not intruding upon the umbilicus. 



Found in the Mountain Limestone at Bolland. 



5. C. SPIRALIS The Spiral Cirrus, pi. XLI. f. 18. 



Cirrus spiralis. Phillips, Geo. of Yorkshire, II. p. 226, pi. 



13, fig. 14. 



Shell obtusely conical; body large; spire short, consisting of 

 three moderately rounded volutions, terminating in a sub-acute 

 apex; base rounded; whole surface covered with strong, spiral, 

 and longitudinal nearly obsolete, oblique striae. 



Cirrus. 



Found in the Mountain Limestone at Bolland. 



6. C. piLEOPSiDEOus. — The Cap-like Cirrus, pi. XLI. fig. 



22. 



Cirrus pileopsideous. Phillips, Geo. of Yorkshire, II, p. 

 226, pi. 13, fig. 6. 



Shell considerably depressed ; body very large ; spire small, 

 consisting of three flattened volutions ; whole shell covered 

 with irregular, somewhat arcuated striae. 



Found in the Mountain Limestone at Bolland. 



7. C. ciNGULATUS. — The Small-girdled Cirrus, pi. XLI. 

 fig. 17. 



Cirrus cingulatus. Phillips, Geo. of Yorkshire, I. p. 107, 

 pi. 4, fig. 28. 



Shell subconic, subdepressed, somewhat turban-shaped; body 

 and spire of about equal length ; spire with spiral and longitudi- 

 nal striae; each volution with a smooth girdle at its upper part; 

 body with many longitudinal, arcuated smooth bands ; base 

 rounded ; apex obtuse. 



Found in the Lower Calcareous Grit at Scarborough; and is 

 in the cabinet of Mr. Bean, by whom it was discovered. 



8. C. PLICATUS.— The Plicated Cirrus, pi. XLL fig. 20. 

 Cirrus plicatus. Sowerby, Min. Conch. II. p. 94, pi. 141, 



fig. 3. 



Shell conical; body large; spire small, consisting of four flat- 

 sided volutions, well divided by the suture; the whole shell 

 with pretty wide spiral striae ; base somewhat angular, and its 

 diameter a little more than the length of the shell ; aperture 

 subquadrangular, its width exceeding its length ; umbilicus 

 plaited, and rather small. 



Found at Folkstone. 



9. C. ACUTUS.— The Acute Cirrus, pi. XLL fig. 23 and 25. 

 Cirrus acutus. Sowerby, Min. Conch. II. p. 93, pi. 141, 



fig. 1. 



Shell conical ; body large ; spire short, consisting of six or 

 seven somewhat ventricose volutions, with an obscure carina 

 near the upper part of each, and terminating in a rather acute 

 apex; base rounded; umbilicus funnel-shaped, expanding; aper- 

 ture orbicular ; surface with fine, regular lines of growth. 



Found in the Limestone, Derbyshire. 



10. C ROTUNDATUS. — The Rounded Cirrus, pi. XLI. fig. 

 24 and 27. 



Cirrus rotundatus. Sowerby, Min. Conch. V. p. 36, pi. 

 429, fig. 1, 2. 



Conical, smooth; volutions convex; base rounded; umbilicus 

 large, with an orbicular aperture ; lines of growth fine ; height 

 and diameter of base nearly equal. 



Distinguished from C. acutus, in being devoid of the flattened 

 portions on the upper surface of the volutions ; and in its general 

 aspect has a bluntness, which serves to characterise it. 



Found in the Limestone of the Lead measures, near Settle, 

 Yorkshire. 



11. C. TABULATUS. — The Boarded Cirrus, pi. XLI. fig. 28. 

 Cirrus tdbulatus. Phillips, Geo. of Yorkshire, II. p. 226, 



pbl3, fig. 7. 



Shell subconic, depressed ; volutions few, subquadrate, tabu- 

 late, or concave above, with flattened sides, and their upper 

 margins acute ; aperture transverse, and ovate. 



Found in the Mountain Limestone of Kendal, Bolland, and 

 Northumberland. 



