508 



Animal red, with plumofe tentacula of a pale colour, 

 and two brown fpots on the head, 



11. 

 Reversa. S. with a fub-cylindric, rugofe, white fhell, much 



wrinkled tranfverfely, more or lefs fpiral, and tapering 

 to a fmall point, but fubje6l to great variety in its turns 

 and windings ; fometimes, three or four whirls, pretty 

 regularly placed laterally, making a diameter of half an 

 inch: others have the fmaller end projefting, and the 

 larger end coiled, either lateral or upon each other, and 

 open in the middle. Sometimes, the fmall end turns 

 contrary to the reft of the (hell ; but it is remarkable, in 

 a fpecies fo irregular in growth, that the aperture fliould 

 almoft invariably turn in the reverfed direfclion. Dia-, 

 meter at the larger end, one tenth of an inch. 



This is fometimes taken on the coaft of DevovJJiire, 

 upon the Petlen opercularis, and rarely on crabs. 



The animal is a Terehella, with branched, ciliated ten- 

 tacula, fpotted with crimfon, which, when fpread, al- 

 moft furrounds a double funnel -ftiaped probofcis, placed 

 one within the other, the ftalk of which is long and flen- 

 der, and originates on the left fide below the tentacula: 

 this infome isgreen, others reddifti, the interior funnel is 

 cut in deep longitudinal flriee ; external one ciliated round 

 the margin: on the right fide, corrcfponding with the 

 iprobofcis, is a fl)ort, cylindric appendage. 



** CON- 



