116 



September 22, 1840. 



William Yarrell, Esq.. V.P., in the Chair. 



The following paper was read, in which Mr. G. B. Sowerby pro- 

 ceeds with his descriptions of the new species of Shells collected by 

 H. Cuming, Esq., in the Philippine Islands. 



Helix Iloconensis. H. testd obovatd, crassiusculd , Icevi, colori- 

 bus variis varie pictd ; spird elevatiusculd , obtusd ; anfractibus 

 quinque, rotundatis, ultimo maxhno ; aperturd rotvndato-subtrape- 

 zoidali, intus albd ; peritremate lato, incrassato, rotundato, reflexo, 

 albo ; labia columellari lato, albo, subplanulato, postice emarginato. 

 Long. 1-3, lat. 0-9, poll. 

 Hab. in foliis arborum prope Sanctum Nicolam, Provincise IIoco- 

 nis septentrionalis ad Insulam Lu^on, Philippinarum. 



The varieties of this species, in colour and size, are very nume- 

 rous ; many of them are remarkable for an apparent interruption of 

 their growth, shown 1)y a band of colour darker than the general 

 ground-colour of the individual across the second, third, or fourth 

 volution ; the recommencement after which suspension is marked by 

 an apparent want of colouring matter to produce the usual spiral 

 bands. 



The following is the enumeration of the varieties which have oc- 

 curred : — 



a. Apex reddish brown, softened down into a greenish yellow 

 ground-colour, which becomes more intense, and is speckled with 

 brown on the last volution, particularly toward the aperture ; poste- 

 rior edge of each volution brown, softened down with pink ; circum- 

 ference of the shell with a greenish brown narrow band behind a 

 brownish pink band ; columellar band and back of the lip reddish 

 brown. From St. Nicolas. 



b. Nearly similar to a. ; anterior circumferential band yellowish. 

 Found on Pandanus Palms at Curimao, in the province of North 

 llocos. 



c. Apex pale reddish brown; ground-colour greenish yellow, 

 speckled on the last volution ; antesutural band light reddish brown ; 

 posterior circumferential band greenish brown, anterior circumferen- 

 tial band pale yellow ; columellar band rose-colour ; back of the lip 

 brownish red. From St. Nicolas. 



d. Apex reddish brown ; ground-colour grayish rose ; antesutural 

 band and back of the lij) reddish brown ; posterior circumferential 

 band pale olive-brown, anterior circumferential band pinkish yellow ; 

 circumference of the columella rose softened into the ground-colour. 

 Fi'om St. Nicolas. 



e. Apex dark brown; ground-colour gray-brown; suture white 

 or yellowish ; antesutural band red-brown ; circumferential band 

 white at its commencement, but becoming yellowish, and yellowish 



