370 PLEUROTOMID^. 



parate, hemispherical, membranous, and thin, one-fifth 

 of an inch in diameter, with a small oval hole in the 

 centre. They are attached at the base to the inside 

 of old bivalve shells and to other smooth surfaces. Each 

 capsule contains from 200 to 300 fry. These are of a 

 brown colour and exquisitely reticulated, each ha\dng 

 a single whorl, globular, and partially umbilicate, with 

 a roundish mouth and an incomplete canal like that of 

 lanthina. The fry, when in the capsule, are very rest- 

 less, and gyrate freely by means of their ciliated front 

 lobes. The young shell may be distinguished from that 

 of D. Lei(froyi by its microscopical textm-e, as I have 

 described in the account of each. 



Among the numerous synonyms are Murex elegans 

 of Donovan, Pleurotoma versicolor (including D. pur- 

 purea, var. Philberti) of Scacchi, Fusus multilinearis of 

 Brown, F. Buchanensis of Macgillivray, Mangelia Cran- 

 chiana of Leach, and Raphitoma rosea of Brusina. Cla- 

 vatula linearis oiS. Wood is unknown to me as a recent 

 species. 



5. D. reticula'ta"^, Renier. 



Murex reticulatus, Renier, Tav, alf. conch. Adr. p. 2. 



Body white, with a few scattered and minute flake-white 

 specks, and having a tinge of yellow in front and a streak 

 of the same colour down the upper part of the foot ; the tissue, 

 examined microscopically, appears veined : pallial tube exten- 

 sile, and therefore varying in length : head broad, deeply 

 cloven in front, with an angidar ridge on each side : tentacles 

 rather long, slender above the eye-stalks, with pointed tips ; 

 eyes black and distinct ; stalks about half the length of the 

 tentacles : foot large and broad, deeply notched or bilobed in 

 front, with recurved ear-shaped corners, finely pointed behind ; 

 this last character (as well as others derived from parts of an 

 expansile nature) depends on the state of activity of the animal 



* Reticulated. 



