KELLIA. 93 



appendage, which also serves as an oviduct. We have omitted 

 to say, that when the faeces are received within the mantle, 

 they are instantly ejected in light yellow or greyish cylindrical 

 pellets. In this respect there is a difference between K. sub- 

 orbicularis and K. rubra; in the former the anal orifice is 

 protruded in a trifling degree externally, in the latter it is 

 within the mantle. 



The foot is broad at the base, long, linguiform, and has the 

 termination rather rounded than pointed; its bluish-white 

 hyaline texture is marked from base to point by a dull intenser 

 flake-white line. When in a basin of sea-water, it at once 

 attaches itself by thread-like filaments that issue from a distinct 

 byssal fissure. The foot when exserted, but not in action, 

 occupies a central position; it usually progresses anteally 

 by being pushed through the anomalous fold of the mantle, 

 and fixing itself by a species of suction, is drawn forward by 

 muscular contraction with much vivacity, and it can also in a 

 more limited manner progress posteriorly. The animal never 

 remains long without forming a byssal attachment, but has no 

 difficulty in slipping its cable when inclined to move, which is 

 always discarded, and when required another is bent. The 

 dark liver and yellow ovarium are situate high in the dorsal 

 region; the latter in the genial season contains from 10-20 or 

 more fully-formed testaceous pulli, and at the full time, the 

 viviparous colony are ejected through the tubular fold of the 

 mantle. 



In a parcel of animals examined in the winter, the ovarium 

 contained no young ; I therefore presume that ' ' Alma Venus" 

 does not influence the self-sufficing loves of these Mollusca until 



" species patefacta est verna diei, 



Et reserata viget genitabilis aura Favoni." 



A review of these notes, and a comparison of them with 

 those of K. suborbicularis, will, I think, prove that this species 

 and its congener are nearly similar in organs, habitudes, and 

 functions, with slight variations of specialties, and that they 

 form a well-defined small genus which I believe only contains 

 the two species that are described. 



