CiECID.E. 355 



S2)ecies of Eylisia. 



Cumiugii, A. Adams. spirata, Sow. 



lanceolata, Reeve. iY\GSiV\n&X&., Adams and Reeve. 



Fam. C^CID.E. 



Lingual membrane short ; teeth in two series (2"0"2), 

 central denticles none, the lateral uncini with the inner 

 one broad and serrulated. Rostrum long and flat ; ten- 

 tacles short, subclavate at the tips ; eyes sessile behind 

 the bases of the tentacles. Mantle thick, fleshy, circular, 

 closely embracing the neck ; a single branchial plume. 

 Foot short, narrow, truncate in front, obtuse behind. 



Operculum horny, circular, multispiral, concave, or 

 externally conical, edges simple. 



The discoverer of the animal of this family, William 

 Clark, observes ihat it is not at all shy, but shows itself 

 in all its points, marching with great vivacity ; it appears 

 to have the greatest affinity with the Vermetidce. 



Genus CJICUM, Fleming. 



Shell, when young, discoidal, when adult, decollated, 

 tubular, cylindrical, arcuated; aperture round, entire; 

 apex closed by a mamillated septum, marking the point 

 at which the original spire has been cast off. 



%w. Brochus, Broicn. Odontidium, Phil Denta- 

 liopsis, Clark. Corniculina, Munster. Csecalium, Macgill. 

 Odontina, Zborz. Odontostoma, Cantr., not UOrh. 



Ex. C. trachea, Montagu, pi. 38, fig. 6. Shell, C. 

 trachea, fig. (>, a. 



