164 



Shell ; oblong, inequilateral, angularly lengthened behind, covered 

 with a bright light-green epidermis, which sometimes passes over 

 the margin ; hinge composed of three teeth in each valve, one of 

 which is generally bifid; no lateral teeth ; ligament external. 



The Glauconome, of which eleven species have been described, is a kind 

 of Solen-Anodon, inhabiting the mouths of rivers in China, Borneo, and 

 the Philippine Islands. The animal has a tongue-shaped foot like Anodon, 

 but it has siphons long, and united nearly to their extremities, like those 

 of Solecurtus. The shell has, moreover, the same divergent-toothed hinge, 

 with an external ligament ; it is of a light half-pearly substance, covered 

 in most instances with a bright light-green epidermis, often thinly in- 

 flected over the margin, and there is a great uniformity both in the form 

 and colour of it in all the species. The Glauconomes live in brackish water, 

 partially imbedded in the mud, and have not been found out of the above 

 localities. One of the species was known to Linnaeus. His name, Solen 

 vlrens, may be seen, together with the specimen, in Linnaeus' s handwriting, 

 in the original collection of the author of the ' Systema Naturse/ now in 

 the possession of the Linnean Society of Londou. 



Species. 



1. angulata, Reeve. 5. curta, Hani. 9. rugosa, Reeve. 



2. cerea, id. 6. psammotella, Desk. 10. straminea, id. 



3. Chinensis, Gray. 7. radiata, Reeve. 11. virens, Linn. 



4. comigata, Reeve. 8. vostralis, Desk. 



Figure. 



Glauconome rugosa. PI. 44. Pig. 238. Shell, showing its light-green 

 epidermis and external ligament. 



Genus 3. SOLECURTUS, Blainville. 



Animal; with the mantle widely open in front for the passage of a 

 large tongue-shaped foot ; siphons more or less long, separated 

 at their extremities ; branchiae continued into the branchial 

 siphon. 



Shell ; elongately or ovately oblong, very inequivahe, gaping at 



