of mollusca. 149 



8. Clanculus. 



Pillar-lip and throat toothed ; forehead with a toothed crest on 

 each side near the tentacula ? 



* Outer lip of adult with a larye tooth. 



1. C. Pharaonis, t. 42. f. 3. 



2. C. patagonicus, t. 48. f. 2. 



3. C. ? Isabelhe, t. 108. f. 4. 



4. C. limbatus, t. 63. f. 1, 6. 



** Outer lip of adult smooth. 



5. C. Maugeri. 



6. C. articulatus. 



§§§ Axis of shell imperforated and flat in front. 



9. Ziziphinus. 

 Shell top-shaped ; aperture quadrangular ; throat smooth. 



* Whorls flat in front. 



1. Z. vulgaris, t. 43. f. 3, t. 107- f. 2?; Forbes #• Hanley, B. M. 



t. E.E. f. 1. 



2. Z. erythroleucos, t. 107. f. 3. 



3. Z. conulus?, t. 107. f. 2. 



4. Z. granulatus ?, t. 43. f. 2 ; Forfos $• Hanley, B. M. t. D.D. f. 4. 



5. Z. diaphanus, t. 64. f. 1-5. 



6. Z. alabastrites, Forbes fy Hanley, B. M. t. E.E. f. 2. 



** Whorls rather rounder and convex in front. 



7. Z. tenuis. 



8. Z. punctulatus. 



9. Z. Tigris. 



The branchial plume of the Ziziphini is acutely pointed in 

 front, increasing in breadth behind to its arrival at the region of 

 the pericardium. It is usually long, tapering like a leaf to a fine 

 point, and composed of one or more rows of short, close-set strands, 

 accompanied in some species, we think, by the rudiments of mucous 

 fillets. The male organ of Ziziphinus is a narrow, white, tough, 

 gently arcuated and subulate filament, lining or attached from base 

 to point to one side of the branchial leaf. The orifice of the ovary 

 is placed below the rectum.— Clark, Moll. 318, 319. 



Central tooth of Ziziphinus vulgaris laminaceous, lanceolate ; three 

 parts at the base oval, suddenly wider, tip recurved, sharp, serrulated 

 on both sides ; lateral teeth on each side five, imbricated, and shaped 

 like the half of the central one ; the last somewhat different in shape ; 

 lateral series of teeth sixty and upwards on each side ; the first by 

 far the stoutest, wide, the base dilated behind, the hook toothed 



