Zoological Society. 215 



" I now proceed to lay seven si^ecies of this interesting genus 

 before the Society, four of which are entirely new to me." 



Genus Phorus. 

 Testa orbicularis, subconica, spira obtusa, anfractibus regularibus, 

 peripheria tubulis cavis interdum ornatji, conchyliorum lapidumque 

 frustis irregulariter agglutinatis ; facie iufemii concaviuscula, 

 granosa aut lamellosa ; umbilico amplo, profundo, sa?p(i ietate 

 occultato ; apertura depressa, marginibus disjunctis, labro sim- 

 plici, acuto. Operculum corneum tenue, ovale. 

 " Such are the characters which appear to me to apply generically 

 to this group. The specific differences consist, not in tlie nature of 

 the materials which are agglutinated, as supposed by Born and others, 

 who had their Trochi lithophorus and conchyliophorus, for stones, 

 shells and corals may often be found collected on the same individual ; 

 but in the perpetuated variations of the living shell, and the manner 

 in which the surrounding debris become attached to it." 



Phorus Solaris. Phor. testa orbiculari, subconicd, paucis calculis 

 versus apicem agglutinatis ; apice acuto ; superficie striis obUquis 

 et undulatis inscriptd; anfractibus tubuJoso-radiatis, tubulis tenui- 

 bus cavis, apertis ; infernd facie plano-concavd, imdulattm striatd ; 

 apertura semicordatd ; umbilico angusto. 

 Reeve, Conch. Syst., vol. ii. pi. 214. f. 1 and 2; Conch. Icon. 

 Phorus, pi. 2. f. 5 a and b. 



Trochus Solaris, Linnaeus, Lamarck, &c. 



Hab. Malacca. (Found in coarse sand at the depth of seven fa- 

 thoms.) Cuming. 



'• This very beautiful shell, in which the periphery of the whorls 

 is extended throughout into hollow spouted spines, has never more 

 than a few pebbles agglutinated to the first one or two whorls. 

 Tlie finest specimen I know of is in the collection of the Rev. Mr. 

 Stainforth, and has furnished me with the drawing above referred to." 



Phorus onustus. Phor. testd orbiculari, conicd, brunnescente-albd ; 

 anfractibus subangulatis, rudibus, vel conchyliis vel lapidibus agglu- 

 tinatis ; infernd facie subconcavd, rufd; ttmbilico atate occultato. 



Reeve, Conch. Syst., vol. ii. pi. 214. f. 3, and 215. f, 8; Conch. 

 Icon. Phorus, pi. I . f. 3 « and b. 



Trochus agglutinans, Lamarck. 



Trochus conchyliophorus, \ 



Trochus lithophorus, j 



Hab. West Indies, 



This is the original and best known species of the group ; it is by 

 far the most profusely covered, and is generally heavily laden with 

 shells, stones, or corals. 



Phorus Indicus. Phor. testd orbiculari, convexo-conicd, ad api- 

 cem acutd, tenuissimd, subtilissime striatd, alba, supcrne rosed ; 

 anfractuum peripheria dilatatd, acutissimd; infernd facie prof undc 

 umbilicatdffusco-fasciatd, lamella laterali cavitatem formante. 



