260 



POPULAR CONCHOLOGY. 



passage of water, &c. ; before, a small cleft, 

 and finally four small openings in the middle 

 of the body, like Clavagella and Phola- 

 domya ; the foot is rather large, oval, thick- 

 ened in front, compressed and pointed be- 

 hind ; the gills are simple, having on each 

 side a long furrow, which indicates the di- 

 vision into two leaves; the mouth has on 

 each side a pair of lancet-formed lip ten- 

 tacles. — 20 species.* 



This very curious shell derives its name 

 of watering pot, from its form, and varies in 

 length from seven or eight inches to a foot ; 

 it is supposed by some authors to attach it- 

 self to the rocks by a byssus passing through 

 the holes in the plate which terminates its 

 tube, but it has generally been found on the 

 sand : its colour is white, with a slight tinge 

 of grey or pale red. 



The Aspergillum agglutinans, from New 

 Holland, has the disk or plate differently 

 constituted from the other species : instead ^^* Jfl — 

 of the small holes, slender tubes are substituted, separate 

 and unequal, with a fissure in the centre. Its specific 

 name is derived from the circumstance of the tube being 

 constantly covered with sand, fragments of shells, and 

 madrepores. The Aspergillum Javanum, from New Zea- 

 land and Java, is the most common species. 



" The row of slender tubes round the disk is supposed 

 to be filled with fleshy filaments from the mantle. The 

 upper end of the tube, which is rarely obtained perfect, 

 is more or less attenuated ; and terminating in smooth un- 



* Chenuj Illustrations Concholiogiques. 



