92 The Hiftory of A N I M A L S. 
edof a kind of fkin, or thick membrane: the whole furface is covered with flight 
undulated farrows. : ; 
I have met with it on the Yorkflflre coaft, but not frequently. Some of the old 
writers have called it Penna marina. 
The other fpecies are, i. The fhorter, marginated Amphitrite. 2. The long and 
almoft fmooth Amphitrite. 3. The long, flender, and digitated Amphitrite. 4. The 
thick, conic Amphitrite, fmall at one extremity. 5. The pediculated, rough Am¬ 
phitrite. 6. The fmall and rounded Amphitrite obtufe at both ends. 7. The large, 
obtufe, and very deeply furrowed Amphitrite. 8. The flightly furrowed Amphi¬ 
trite. called Adamas marinus. 
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T E T H Y S. 
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T HE body of the Tethys is formed, as it were, of two lips, with an oblong 
cartilaginous body between them : there are four tentacula, which have the form 
of ears, and two perforations in moft fpecies near the tentacula. 
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Tethys rugofa corpore longiore . 
The oblong> rugofe Tethys . 
This grows to two inches and a half in length : it’s fubflance is tough, but not 
hard ; it’s colour a dufky grey, with an admixture of brown : the diviflons of the 
body are large and thick ; the intermediate part of a cylindrie figure, but buttoned, 
as it were, at the end: the tentacula are broad and fhort, and two of them are much 
fhorter than the others. 
We have it on the coafts of Cornwal, and in fome other places. Authors have 
very confufedly defcribed it under the name of Holothurium and Tethys, among feve- 
ral other bodies j fome of them fpecies of this genus, others of others, under the 
name of Tethyos variae fpecies. 
Tethys verrucofa corpore br&vioru 
The verrucofe Tethys , with a porter body. 
This is a fmall fpecies: the diviflons of the body are thick, fomewhat flat, and of 
a firm texture; the intermediate part is of an oval figure, more firm and verrucofe, or 
covered with fqiall, obtufe protuberances 5 the colour of the whole is a bluifh-grey: 
the tentacula are all four of equal length, and are flender and thin ; the apertures are 
large. • ; 
This is frequent about the coafts of Italy, but is not met with on our own. It 
has been imperfe&ly figured and defcribed by authors, among their various fpecies of 
Tethys. 
TethyS corpore ovato-glabro. 
The fmooth , oval-bodied Tethys . 
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This grows to about an inch and half in length, and more than an inch in diameter 
in the largeft part: the diviflons of the body are broad, fhort, and thick : the inter¬ 
mediate part is alfo thick, fhort, and rounded at the end : the tentacula are thick and 
obtufe, and the perforations very fmall: the furface of the whole is fmooth, and the 
texture foft and tender. 
This is found on our own coafts, but not frequently. I have met with it in Suflex* 
The other fpecies are, 1. The large, oblong, fmooth Tethys. 2. The large, ver¬ 
rucofe, thick Tethys. 3. The irregular-bodied Tethys. 4. The roundifh-bodied, 
furrowed Tethys. 5. The fhort, hairy Tethys. 6. The pyriform Tethys. 7. The 
broad, flat Tethys. 8. The fmall, grey, hairy Tethys. 
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N E R E I S. 1 
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f" | ' H E body of the Nereis is of a cylindrie figure 5 and the tentacula are four in 
j[ number, but two of them are ufually very fhort, often fcarce perceptible. 
Nereis 
