The public buildings include the cathedral (1760), the government palace, the municipal palace, the episcopal palace, the church of Santa Ana, a national theatre, a school of arts and trades, a foreign hospital, the former administration building of the Canal Company, Santo Tomas Hospital, the pesthouse of Punta Mala and various asylums. The houses are mostly of stone, with red tile roofs, two or three storeys high, built in the Spanish style around central patios, or courts, and with balconies projecting far over the narrow streets; in such houses the lowest floor is often rented to a poorer family.
Here are the ruins of a palace of the native khans, built in the 16th century; the mosques of the Persian shahs, built in 1078 and now converted into an arsenal; nearer the sea the "maidens' tower," transformed into a lighthouse; and not far from it remains of ancient walls projecting above the sea, and showing traces of Arabic architecture of the 9th and 10th centuries.
Rarely the nephridium does not communicate with the coelom; in such cases the nephridium ends in a single cell, like the "flame cell" of a Platyhelminth worm, in which there is a lumen blocked at the coelomic end by a tuft of fine cilia projecting into the lumen.
Parapod.ia hardly projecting; palps of prosomium forming branched gills; no pharynx or eversible buccal region; no septa in thorax, septa in abdomen regularly disposed.
The foot of the limpet is a nearly circular disk of muscular tissue; in front, projecting from and raised above it, are the head and neck (figs.