PHORUS.— Plate I. 



ad apicern acutd, tenuissimd, subtilissime strlatd, alba, ! 

 superne rosed ; anfractuum peripherid dilatatd, acu- 

 tissimd ; infernd facie profundi umbilicatd, fuseo- 

 fasciatd ; lamelld lateruli cavitatemformante. 

 The Indian Phorus. Shell orbicular, convex, sharp at 

 the apex, very thin, very finely striated ; white, 

 rose-tinted towards the upper part ; periphery of 

 the whorls dilated, very acute ; under surface deeply 

 umbilicated, brown-banded, lateral fold forming a 

 cavity. 

 Reeve, Pro. Zool. Soc, 1842; Conch. Syst., vol. ii. 

 pi. 215. f. 6. 



Trochus Indicus, Gmelin, Lamarck ; Schubert and 

 Wagner, Supp. to Chemnitz, p. 129. pi. 229. 

 f. 4062 «, b. 

 Hab. Cochin China. 



I never remember having seen this shell with any 

 shells or pebbles attached to it, but the first two or three 

 whorls sufficiently indicate that some have been agglu- 

 tinated to it at one time or another by the numerous in- 

 dentations which they exhibit. The under surface of the 

 shell is generally marked with a circular brown band, 

 the centre being widely umbilicated. 



Species 3. (Fig. a and *, Mus. Walton.) 



Phorus onustus. Phor. testd orbkulari, conoided, brun- 



nescente-albd, striatd; anfractibus subangulatis, rudi- 



bus vel conchy His, vel lapidibus agglutinatis; infernd 



facie subconcavd ; umbilico atate occnltato. 



The heavy-laden Phorus. Shell orbicular, conoidal, 



brownish white, striated ; whorls somewhat angu- 

 lar, rude, with shells or stones agglutinated to them ; 

 under surface rather concave ; umbilicus concealed 

 in adult specimens. 



Reeve, Pro. Zool. Soc, 1842; Conch. Syst., vol. ii. 

 pi. 214. f. 3. and pi. 215. f. 8. 

 Trochus agglutinans, Lamarck. 

 Fig. a. Trochus conchyliophorus, Born. 

 Fig. b. Trochus lithophorus, nonnul. 



Hab. West Indies. 



This is the original and best-known species of the 



group, and is generally very heavily laden with shells, 



stones, &c. 



Species 4. (Mus. Cuming.) 



Phorus pallidums. Phor. testd solidd, palhduld, acu- 

 tissime pyramidali ; volutis angulatis, conchyliorum 

 frustis sparsis agglutinatis; infernd facie leviter 

 concavd, subtilissime striatd. 



The pale Phorus. Shell solid, rather pale-looking, 

 very sharply pyramidal ; whorls angular, with scat- 

 tered fragments of shells agglutinated to them ; 

 under surface slightly concave, very finely striated. 



Reeve, Pro. Zool. Soc, 1842; Conch. Syst., vol. ii. 

 pi. 214. f. 4. 



Hab. Coast of Japan ; Siebald. 



The shells of this species have a singular pallid ap- 

 pearance, though fresh as when taken alive, and the frag- 

 ments of shells agglutinated to them are unusually 

 broken. 



