CONCSirERA. 459 



Kellia, Tutton, 1822. 



Mtymohgy, named after Mr. O'Kelly, of DuTblin. 



Synonyms, Lasea (Leach.), Br. 1827. Cycladina (Adansonii) 

 Cantr. Bornia (sub-orbicularis) Phil. Poronia (rubra), Ptecluz 

 (not Willd). Erycina (cycladiformis), Desh. (not Lam.) 



Types, K. sub-orbicularis, Mont. K. rubra. PL XIX., 

 Mg. 12. 



Bhell small, thin, sub-orbicular, closed ', beaks small ; margins 

 smooth ; ligament internal, interrupting the margin (in K. 

 suhorbicularis), or on the thickened margins (in K. rubra) ; 

 cardinal teeth 1 or 2, laterals 1 — 1 in each valve. 



Anintal with the mantle prolonged in front into a respiratory 

 canal, either complete (in K. suborhicularis) or opening into the 

 pedal slit (in ^. rubra) ; foot strap-shaped, grooved ; gills large, 

 two on each side, united posteriorly, the external pair narrower 

 and prolonged dorsally ; palpi triangular ; posterior siphonal 

 orifice single, exhalent. 



The hinges of these little shells are subject to variations, 

 which are not constantly associated with the modifications of 

 the mantle-openings. They creep about freely, and fix them- 

 selves by a hyssus at pleasure. K. r'abra is found in crevices of 

 rocks at high-water mark, and often in situations only reached 

 by the spray, except at spring-tides; other species range as 

 deep as 200 fathoms. K. Lajperousii (Chironia), Desh. PL XTX., 

 Fig. 11, was obtained, burrowing in sandstone, from deep 

 water, at Monterey, California. 



Distribution, 20 species. Norway — New Zealand — California. 



Fossil, 20 species. Eocene — . United States, Europe. 



Sub-genera. Turtonia (minuta), Hanley. Shell oblong, in- 

 equilateral, anterior side very short ; ligament concealed 

 between the valves ; hinge-teeth 2.2. Animal with the 

 mantle open in front ; foot large, heeled ; siphon single, 

 slender, elongated, protruded from the long end of the shell. 

 Distribution, Greenland, Norway, Britain. In pools and cre- 

 vices of rocks between tide-marks, and in the roots of sea- 

 weeds and corallines. Mr. Thompson obtained them from the 

 stomachs of mullets taken on the north-east coast of Ireland. 



Pythina (Deshayesiana), Hinds. (MylUta, D'Orb, and Eecl.) 

 Shell trigonal, divaricately sculptured ; ligament internal ; right 

 valve with 2 lateral teeth, left with 1 cardinal and 2 laterals. 

 Distribution, 8 species, New Ireland, Australia, Philippines. 

 Fossil, 2 species. Eocene — , Erance, Java. 



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