Phe Hiftory ^ANIMALS. .153 
whole {hell is white, and it’s furface is fmooth, and naturally polifhed, as is alfo that 
of mod of the fpecies of this genus. 
We have this from the Eaft Indies, and from the coaft of Africa* 
Porcellana utrinque roftrata , alba , fufco variegata. 
The white Porcellana^ variegated with brown, and roftrated at each end. 
This is a fmall, but an extreamly elegant, fpecies; it is barely three quarters of an 
inch in length, and about half an inch in diameter, and is roftrated or beaked at each 
end but in a very different manner; the roftrum at the head of the ftiell is fhort and 
broad, and feems no more than a continuation of the mouth, furrounded with a lip : 
that at the oppofite extremity is longer, flender, and truncated ; the body of the fhell 
has a fine white for it’s ground colour ; and the variegations, which are of a bright 
brown, are difpofed in crooked and irregularly angulated lines, fo that they have 
fomething of the appearance of the marbled figures on coloured paper. 
We have it from the fhores of the American iflands in confiderable plenty. 
Porcellana utrinque roftrata bullata . 3£l)t §>I!liUt {30£ 
The bidlated Porcellana ., roftrated at each end. 
This is alfo a fmall fpecies; it does not exceed three quarters of an inch in length, 
and it’s diameter is about half an inch : the body of the fhell is of an oval figure, and 
very gibbofe, or elevated on the back ; it is roftrated at each extremity : the beak at 
the head is the longeft, and both are fplit at the extremity : the whole furface of the 
ftiell is covered with elegant, round protuberances, of a fine white colour, imitating 
pearls. ^ • Y ~ ■ 
We have it from the coaft of Africa. 
Porcellana grifea macula fingulari magna fufed. 
The grey Porcellana , with a Jingle , large brown ftpot. 
This is about an inch in length, and two thirds of an inch in diameter : the back is 
gibbofe, and confiderably elevated; the mouth is wide for that of one of this genus, 
and is continued in a roftrated form at each extremity of the ftiell; at the head the 
roftrum is oblong, but truncated; and at the other extremity it is is very fhort, and 
turned up : the colour of the fhell is white, but on the fummit of the back there is a 
large, irregular fpot of brown, in a rude manner, refembling a beetle, or fome other 
animal of that form. 
We have it from the coaft of Guinea* 
The other fpecies of the Porcellana may be arranged under four divifions, as they 
are, 1. Conglobated and thick : 2. Pyriform, or oval and thin : 3. Oblong and thick; 
and, 4. Irregularly gibbofe. 
1. Of thofe which are conglobated and thick, there are, 1. The elegantly-lettered 
Porcellana. 2. The tyger-fpotted Porcellana. 3. The fnake Porcellana. 4. The ftnall, 
flatted Porcellana. 5. The fmall, flatted, and, as it were, fimbriated Porcellana. 
6. The elegantly pundtated Porcellana. 7. The Ample, greyifh-white Porcellana. 
8. The fhort and roftrated, elegant, Chinefe Porcellana. 9. The Amply, violet-co¬ 
loured Porcellana. 10. The reddifti Porcellana. n. The elegantly variegated Por¬ 
cellana. 12. The guttated Porcellana. 13. The broad, depreffed Porcellana, ele^ 
gantly variegated, and called the Tortoife-fhell Porcellana. 
2. Of the pyriform and thinner Porcellana there are, 1. The wide-mouthed Porcel¬ 
lana, elegantly fpotted with yellow. 2. The brown Porcellana, with two zones, and 
with a wide mouth. 3. The elegantly variegated brown, white, and yellow arcu¬ 
ated-mouthed Porcelain. 
3. Of thofe which are of an oblong form and thick, there are, 1. The fhort and 
very gibbofe, fmall, oculated Porcellana, or Argus-fhell. 2. The irregularly oculated 
Porcellana, called the falfe Argus. 3. The greenifh Porcellana, with numerous, pearly, 
round, and fmall tubercles. 4. The brown Porcellana, variegated with four red 
zones. 5. The brown Porcellana, with four yellow zones. 6. The elegant Porcel¬ 
lana, with amethyftine zones. 7, The green-fpotted Porcellana. 8. The greyifh- 
R r brown, 
)t beetle 
$o?ceiatrt. 
