412 ENTOZOA. 
four feet in length. It remains buried in the sand, and, it is 
said, attacks the Anomiz, which it sucks in their shell *. 
In the vicinity of Nemertes should probably be placed the 
Tupucaria, Renierz, 
Equally large and extremely elongated, but furnished with a small 
mouth opening under the anterior extremity. 
OpHiocePHuaLus, Quoy, Gaym., 
With the same form, but the extremity of the mouth cleft. 
CEREBRATULA, Renier?, 
Which seems only to differ in the greater shortness of the body +. 
ORDER II. 
PARENCHYMATA. 
The second order of the Entozoa comprises those species in which 
the body is filled with acellular substance, or even with a continuous 
parenchyma, the only alimentary organ it contains being ramified 
canals, which distribute nourishment to its different points,and which, 
in most of them, originate from suckers visible externally. The 
ovaries are also enveloped in this parenchyma or that cellulosity. 
There is no abdominal cavity, nor intestine properly so called; the 
anus is wanting, and if we except some equivocal vestiges in the first 
families, there is nothing to be found which bears a resemblance to 
nerves. 
We may divide this order into four families 
FAMILY I. 
ACANTHOCEPHALA. 
The Parenchymata of this family attach themselves to the intes- 
tines by a prominence armed with recurved spines, which also appears 
to act as a proboscis. They form the single genus 
Ecuinoruynecavs, Gm., 
Where the body is round, sometimes elongated, and sometimes in the 
form of a sac, provided anteriorly with a prominence in the form of 
* For this singular worm, which is mentioned by Borlasse only, I am indebted to 
M. Dumeril, who found it near Brest. It is the genus Borzasia of Oken; M. 
Sowerby had previously called it Lingus. 
+ We have neither seen the Tubularia nor Cerebratula. The names of Tubularia 
and Ophiocephalus, being already applied to other genera, cannot subsist. 
