96 5- HI. DIST. CHAR. Prototype. 



73. TESTAL (testak} a reliquium deriving its 

 form from a shell ; f and 



employed them. (v. Derbyshire Petrif.) They will be found ne- 

 cessary, in discriminating the external parts of the body in certain 

 fossil zoophytes. 



STIPE (stipes} the elongated appendage to the body of the 

 zoophyte, by which it is frequently (not always) affixed to stones, 

 rocks, and other substances as in Hydra, Vorticella, <5fc. 



Linnaeus calls this part stirps, a terra he also applies to the mem- 

 branaceous, horny, and fibrous supports, fabricated by the 

 Gorgonia, Isis, Flustra, &c. By Gmelin the term is further 

 extended to the stony matter or coral, deposited by the Lytho- 

 phyta of Linnaeus, and in this sense we have retained it. 

 But the fleshy stern in Hydra, &c. as well as the crustaceous 

 one in the genus Stylastrum (v. Note on the Stylastrum, . V.) 

 is an innate part of the animal, and perfectly distinct in its nature 

 from the fabricated props orfulciments ; whether solid, as in Gor- 

 gonia, Ms, &c. or cavernous, as in those belonging to the Madre- 

 porce, Tubiporte, &c. We have, therefore, deemed it expe- 

 dient to mark the distinction by appropriate terms. 



Disk (discus} in an articulated stipe , the internal part or surface 

 by which one joint is united to another. 



Ambit (ambitus} the surrounding, external surface of each joint 

 of the stipe. 



Branches (rami) are the lateral arms proceeding from the stipe 

 (not from the body) of the zoophyte. 



f The terms used in discriminating shells are very numerous : 

 for their explanation we refer the reader to the " Fundament a 

 Testaceologite," given in the " Am<enitates Academics ;" and to 

 the work above mentioned, viz., Elements of Natural History. 

 The following imperfect list of testaceological terms is introduced 

 here, merely to note a few, we have found it necessary to add to 



