This Crown Cone, Conus regius Gmelin, 1791, was observed and photographed at the Houston Museum of Natural Science, Texas. The date stated here is when i photographed it, since there is no date on the specimen label.
This is a common species occurring from east Florida to Brazil, Caribbean and Gulf of Mexico, including Texas. In another record (here: http://www.inaturalist.org/observations/906219), I observed this species live off the Texas coast.
Like all other cone shells, this species is also poisonous, ans should be handled very carefully.
Read more about this species in Tunnell et al. (2010) Encyclopedia of Texas Seashells, p. 237.
ssp. leucocephalus on location
In freshwater pond
Lower (black) individual.
According to Dennis Paulson, this is the still undescribed "Antillean Skimmer" that is being studied by someone who will hopefully describe it.
Mating display. Note the individual on the ground above and to the left.