124 



MOLLUSCA. 



[Maldani.*. 



Found plentifully on the rocks and stones at Milton, Devon- 

 shire, and other localities. 



7. Spirorbis corrugatus, pi. LVI, f. 46. 



Spirorbis corrugatus, First Ed., pi. 1, f. 46; Fleming, Edin. 

 Ency., VII, p. 68 ; Serpula corrugata, Montagu, p. 502 ; Maton 

 and Rackett, p. 242. 



Shell strong, with rough transverse wrinkles, white, and only 

 a small portion of the second volution visible ; centre rather 

 deeply umbilicated ; base spreading but little ; aperture orbicu- 

 lar. Diameter an eighth of an inch. 



It is easily distinguished from S. spirillum, in being con- 

 siderably stronger, and the base never spreading so much. 



Found on the slate rocks at Milton. 



8. Spirorbis corneus, pi. LVI, f. 43. 



Spirorbis corneus, First Ed., pi. 1, f. 43; Fleming, Edin. 

 Ency., VII, p. 68 ; Serpula cornea, Adams, Linn. Tr., V, p. 

 6, pi. 1, f. 33, 34, 35 ; Montagu, p. 503 ; Maton and Rackett, 

 p. 243. 



Shell regular, round, subdepressed, pellucid ; with three horn- 

 coloured volutions. 



Inhabits the coast of Pembrokeshire. 



9. Spirorbis lucidus, pi. LVI, f. 56, 60. 



Spirorbis lucidus, First Ed., pi. 1, f. 56, 60; Fleming, Edin. 

 Ency., VII, p. 69, pi. 205, f. 4; Serpula reflexa, Adams, Linn. 

 Tr., V, p. 6, pi. 1, f. 31, 32; Serpula lucida, Montagu, p. 506; 

 Maton and Rackett, p. 243. 



Shell irregular in form, more or less spiral, and with two or 

 three volutions, sometimes placed laterally, in others they wind 

 upon each other, and are often apart, or scalariform ; very pel- 

 lucid, glossy, and white; aperture orbicular, projecting upwards. 

 Diameter half a line. 



Distinguished from all other species by its glassy appearance. 



Found on many of the British and Irish coasts, adhering to 

 different species of sertularia and other corallines. 



10. Spirorbis conicus, pi. LVI, f. 58. 



Spirorbis conicus, First Ed., pi. 1, f. 58; Fleming, Edin. 

 Ency., VII, p. 68, pi. 205, f. 3. 



Shell conical, strong, depressed, opaque, dull yellowish-white; 

 two volutions, the exterior one large, with a carina on its 

 superior portion, and embracing the other ; aperture towards 

 the top. 



Found in Zetland, on old shells, by Dr. Fleming. 



11. Spirorbis reversus, pi. LVI, f. 52. 



Spirorbis reversus, First Ed., pi. 1, f. 52 ; Fleming, Edin. 

 Ency., VII, p. 60; Serpula reversa, Montagu, p. 508; Maton 

 and Rackett, p. 243. 



Shell more or less spiral, extremely variable, subcylindrical, 

 white, with strong, transverse wrinkles, and tapering to a small 

 point ; aperture orbicular, and invariably turning in the reverse 

 direction. 



This is the largest species of the genus. 



Found on the Devonshire coast, and also in the Frith of 

 Forth. 



12. Spirorbis annulus, pi. LVI, f. 44. 

 Spirorbis annulus, First Ed., pi. 1, f. 44. 



Shell strong, white, opaque, nearly orbicular; with three 

 rounded volutions, crossed by strong, regular, transverse, ring- 

 like grooves; deeply umbilicated; aperture nearly orbicular. 

 Diameter a tenth of an inch. 



I found this adhering to an oyster from Prestonpans, Frith 

 of Forth. 



13. Spirorbis striatulus, pi. LVI, f. 59. 

 Spirorbis striatulus, First Ed., pi. 1, f. 59. 



Shell round, spiruliform, umbilicated ; with three volutions, 

 rolled upon each other, the exterior one detached at its exter- 

 nal termination ; surface with numerous, fine, rib-like, spiral 

 stria; ; aperture quite orbicular. Diameter one-tenth of an 

 inch. 



Found at Dunbar, by General Bingham, adhering to sertu- 

 laria. 



14. Spirorbis carinatus, pi. LVI, f. 48. 



Spirorbis carinatus, First Ed., pi. 1, f. 48; Fleming, Edin. 

 Ency., VII, p. 68, pi. 20 ; Serpula carinata, Montagu, p. 502 ; 

 Maton and Rackett, p. 242. 



Shell with the exterior angulated volution provided with a 

 dorsal carina ; interior volutions concealed by the outer one ; 

 umbilicated, and sometimes pervious ; base slightly spreading ; 

 aperture orbicular. 



Found on several of the English and Scottish coasts. 



Family II. — Maldani^e. 

 BranchiK of the animal intermediate ; tube open at both 

 ends. 



Genus 3 Brochus Brown. 



Shell tubular, subcylindrical, slightly tapering, and subarcu- 

 ated; imperforate at the smaller end; aperture orbicular, placed 

 at the larger extremity. 



1. Brochus trachiformis, pi. LVI, f. 10. 



Brochus trachiformis, First Ed., pi. 1, f. 10; Brown, Conch. 

 Text Book, p. 158, pi. 19, f. 25 ; Dentalium Trachea, Montagu, 

 p. 497, pi. 14, f. 10; Maton and Rackett, p. 239. 



Shell subcylindrical, tapering a little, slightly arcuated ; with 

 strong, regular, transverse, annular striae ; smaller end imper- 

 forate, truncated, and provided with a small, blunt knob ; aper- 

 ture orbicular ; colour ferruginous, somewhat paler towards the 

 smaller end. Length somewhat more than an eighth of an 

 inch ; diameter about a fifth of its length. 



Found on the Devonshire and Welsh coasts, but is a rare 

 and very local species. 



2. Brochus striatus, pi. LVI, f. 13. 

 Brochus striatus, First Ed., pi. 1, f. 13. 



Shell white, subcylindrical, a little arcuated, and rather 

 abruptly tapering to the narrow end, which is destitute of a 

 knob ; whole surface covered by fine, close-set, annular stria' ; 

 aperture large, nearly orbicular. Length not an eighth of an 

 inch ; diameter about a fifth of its length. 



This differs from the B. trachiformis, in being shorter, less 

 arcuated, in the stria; being much finer, and in having no knob. 



Found at Dunbar, by General Bingham. 



3. Brochus reticulatus, pi. LVI, f. 11. 

 Brochus reticulatus, First Ed., pi. 1, f. 11. 



Shell cylindrical, abruptly tapering towards the base, where 

 it is provided with a rather long knob ; whole surface covered 

 by annular and longitudinal strias ; aperture large and orbicular. 

 Length an eighth and a half of an inch ; diameter of aperture a 

 fourth of its length. 



