Fosus. 



MOLLUSCA. 



61 



shell covered with numerous, nearly obsolete, spiral striae; aper- 

 ture oblong-ovate, slightly pointed above and below, ending iu 

 a short, nearly straight canal ; inner lip smooth, rather broad in 

 proportion to the size of the shell ; outer lip thin and even on 

 the edge. 



In some fossil specimens the beak is considerably curved. 



Found at Holywells, Aldborough and Walton, Suffolk. 



11. F. Manni.— Mann's Fusus, pi. XXXVI. fig. 20, 21. 

 Murex rugosxcs. Sowerby, Min. Conch. II. p. 225, pi. 190, 



fig. 1,2. 



Shell subfusiform; spire consisting of five or six well rounded 

 volutions, terminating in a somewhat obtuse apex, with about 

 twelve longitudinal, elevated ribs ; the whole shell covered with 

 regular spiral stri«e, and the body volution devoid of ribs ; aper- 

 ture elliptical, a little pointed above, and terminating beneath 

 in a short, straight canal ; inner lip smooth, slightly reflected on 

 the columella above, and gradually widening as it descends, 

 until it reaches the beak, when it becomes suddenly contracted; 

 outer lip slightly thickened and smooth on the margin. 



Named in honour of my respected friend Robert Mann, Esq., 

 surgeon, Manchester, a zealous naturalist. 



Found in the Crag at Plumstead. 



12. F. Pakkinsonii Parkinson's Fusus, pi. XXXVI. fig. 



17. 



Murex rugosus. Parkinson, Org. Rem. III. p. 64, pi. 5, 

 fig. 16. 



Shell elongated ; spire rather more than a third of the length 

 of the shell, consisting of five or six moderately ventricose 

 volutions, terminating in an obtuse apex ; with many longi- 

 tudinal, rather flat ribs, crossed by numerous faint striae ; aper- 

 ture ovate, a little contracted above, and ending below in a short, 

 slightly bent canal ; pillar lip smooth and broadly reflected on 

 the columella ; outer lip a little thickened internally. 



Found in the Crag, Essex. 



13. F. iNTEBRUPTUS The Interrupted Fusus, pi. 



XXXVI. fig. 37, 38. 



Murex interruptus. Pilkinton, Linn. Trans. VII. p. 117, 

 pi. 11, fig. 5. Sowerby, Min. Couch. III. p. 181, pi. 304, fig. 

 1,2. 



Shell subturreted ; spire smooth and of medium length, con- 

 sisting of five or six nearly flat volutions, terminating in a sharp 

 apex; the smaller volutions with a broad, flattened space, above 

 which two sharp furrows run along their upper edges : body 

 rather inflated, covered with many spiral furrows ; aperture 

 ovate, slightly pointed above, terminating beneath in a wide, 

 slightly curved canal of medium length ; inner lip smooth, a 

 little reflected on the columella, and displays the impression of 

 the sulci beneath, which produces a striated appearance ; outer 

 lip plaited internally, and smooth on its margin. 



Found in the London Clay in Hampshire, and at Barton. 



14. F. JUNCEUS. — The Slender Fusus, pi. XXXVI. fig. 

 29, 30. 



Murex junceus. Brander, Foss. Hant. p. 17, pi. 1, fig. 26. 

 Buccinum junceum, Sowerby, Min. Conch. IV. p. 103, pi. 

 375, fig. 1. 



Shell much elongated and taper ; spire greatly produced, 

 equal in length to the body, with six or seven moderately in- 

 flated volutions, divided by a small, plain furrow, and termi- 

 nating in an obtuse apex ; whole shell covered with sharp, 



elevated, uniform, spiral and longitudinal striae, producing a fine 

 reticulated appearance ; aperture long, narrow, acute, and angu- 

 lar above, with a slight internal notch, terminating below in a 

 very short, straight canal ; inner lip smooth, broad above, and 

 narrowing as it descends ; outer lip somewhat arcuated in its 

 centre, sharp at the edge, and deeply striated within. 

 Found at Barton, and in the London Clay at Highgate. 



15. F. suLCATUs. — The Furrosved Fusus, pi. XXXVI. fig. 

 18, 19. 



Buccinum sulcatum. Soweiby, Min. Conch. IV. p. 103, pi. 

 375, fig. 2. Fleming, Brit. An. p. 344. 



Shell greatly elongated, subturreted ; spire much produced, 

 equal in length to the body, consisting of six or seven ventricose 

 volutions, terminating in an obtuse apex, furnished with about 

 seven linear, transverse furrows on each of the volutions ; aper- 

 ture ovate, ending below in a short, slightly recurved canal ; pillar 

 lip smooth, a little concave ; outer lip considerably thickened, 

 rounded beneath, with about twelve elongated teeth internally. 



Found in the Crag at Ramshot. 



16. F. MiTRULA — The Mitre-formed Fusus, pi. XXXVI. 

 fig- 3, 4. 



Buccinum Mitrula. Sowerby, Min. Conch. IV. p. 103, pi. 

 375, fig. 3. 



Shell turreted ; spire long, about equal to the body, with six 

 or seven volutions, ending in an acute apex ; the whole shell 

 covered with from ten to twelve longitudinal ribs, which are 

 most prominent on the upper part of the volutions ; aperture 

 elongated, a little contracted both above and below, obtuse 

 above, terminating in a short, straight, wide canal, which is even 

 at the base; inner lip narrowly reflected on a straight columella; 

 outer lip almost straight on the margin, having a small rounded 

 sinus near its junction with the body, below which it is slightly 

 produced. 



Found in the Crag at Ramshot. 



17. F. cosTELLiFERUs The Small-ribbed Fusus, pi. 



XXXVLfig. 11, 12. 



Fusus costellifer. Fleming, Brit. An. p. 353. Murex cos- 

 tellifer, Sowerby, Min. Conch. II. p. 225, pi. 199, fig. 3. 



Shell subturreted; spire of medium length, consisting of four 

 somewhat ventricose volutions ; with about eighteen rather de- 

 pressed, slender, longitudinal ribs, crossed by numerous, sharp, 

 spiral striae ; aperture subovate, slightly contracted above, and 

 terminating in a short, open, and nearly straight canal; inner lip 

 reflected on the straight part of the columella only ; outer lip 

 expanded, and smooth on the margin. 



Found in the Crag at Maiden. 



18. F. GBADATUS. — The Graduated Fusus, pi. XXXVI. 

 fig. 7, 8. 



Fusus gradatus. Fleming, Brit. An. p. 352. Murex gra- 

 datus, Sowerby, Min. Conch. II. p. 227, pi. 199, fig. 6. 



Shell ventricose ; spire short, acute, consisting of four ab- 

 ruptly tapering volutions, terminating in a sharp apex, with 

 about ten longitudinal, varicose ribs, which are very prominent 

 above, and producing a square, strongly turreted, and flattened 

 step-like appearance in the volutions; aperture oval, slightly 

 angular above, ending in a short, open, slightly curved canal ; 

 inner lip smooth ; outer lip a little expanded, and even on the 

 margin. 



Found in the Crag at Maiden. 

 Q 



