46 AMERICAN JOURNAL 



NOTES ON SHELLS. 



BY 0. A. L. MoRCII. 



According to a specimen, dredged by Mr. Robert MacAn- 

 drew, at Mogadore, the Omphalius ccelatus, of A. Adams, (Proc. 

 Zool. Soc. 1854, p. 39,) is provided with a calcareous operculum, 

 which proves that this species may be removed to Turbo. 



Turbo (Anadema) ccelatus, A. Adams, non L. 



Omj)halius [Anadema) ccelatus, Ad., Genera, 1, p. 930. 



Turbus cameus, " Gm.," Lowe's List of shells observed at Mo- 

 gadore. Proc. Swe. Soc. v, p. 129, 1860. 



As there is already a Turbo ccelatus, L., I propose for this 

 species Turbo MacAndrewii. 



Mesalia brevialis, Lam., or a closely allied species from 

 Algiers, has a corneous, deeply concave operculum with very 

 broad volutions. This proves that Turritella reticulata, Migh., 

 cannot belong to Mesalia as supposed by Reeve (in ConcJwlogia 

 lconica.) Moller describes the animal of Turritella lactea and 

 polaris (erosa, Couth.,) thus : 



Animal dirty-white, foot small and short, 1| of the length of 

 the shell. Base of foot truncate before, rotundate behind. Pro- 

 boscis very long. Tentacula of middle size, blunt. The oper- 

 culum horny, yellow, orbicular, with nine narrow turns, nearly 

 flat. When it creeps the head is carried very high. The pro- 

 boscis is in continual motion ; it is quickly protruded, soon re- 

 tracted to half its length, and quickly elevated or reflected to 

 the foot. The animal moves slowly. The excrements are 

 globular. Tachyrynchus. 



Turritella erosa, Couth. 



Turitella reticulata^ Migh. (T. lactea, Moller.) 



