48 HAUSTATOR. 
with the canal large, deltoid; bilocular within. PrnvTamervs, 
Sow. Fig. 210,211, G. Conchidium, copied from Dalman. 
GYROGON'’A. Lam. 
GYROIDIN’A. D’Orb. A genus of microscopic Foraminifera. 
HALIO'TIS. Linn. (Ara, ala,sea; ros, otos, ear.) Fam. Macro- 
stomata, Lam. Otides, Bl. Deser. Auriform, broad, depressed, 
pearly within, rough, costated, tuberculated without; spire short, 
flat, consisting of one or two whorls; aperture wide, ovate; colu- 
mella laminar, flat, oblique; a spiral series of perforations running 
along the dorsal margin. Obs. The splendid shells belonging to 
this genus are remarkable for the pearly iridescence of the inner 
surface, and the row of holes following the course of the 
spire. The soft parts are eaten in Guernsey and Jersey, and 
reckoned delicious. Fig. 338, H. rubra. 339, Padollus, Monti. 
HA’LIOTOID. (Haliotis and e8os, eidos, form.) Ear-shaped. 
HA’MIFORM. (Hamus,a hook.) Curved at the extremity. 
HAMITES. Parkinson. (Hamus, a hook.) Fam. Ammonacea, 
Lam. Deser. Elongated, cylindrical, chambered, recurved at the 
smaller extremity, annulated; septa lobed and sinuated. Obs. 
This remarkable fossil from the Baculite limestone in Normandy, 
differs from Baculites in being curved round at one extremity, 
a circumstance from which its name is derived. Some small 
species are found in Chalk Marle, Folkstone. Fig. 484.* H. 
cylindricus. 
HARPA. Brug. (Harpa, a harp.) Fam. Purpurifera, Lam. 
Entomostomata, Bl. Deser. Oval, ventricose, longitudinally 
and regularly costated; spire short, with rounded, dome-lke 
whorls; aperture wide, emarginated; outer lip thickened, re- 
flected, composing the last costa or rib; inner lip polished, 
spread over part of the body whorl, terminating ina point. Obs. 
This beautiful genus of shells is so clearly defined by the regular 
longitudinal ribs that adorn the external surface, suggesting the 
idea of a stringed instrument, that there is no danger of con- 
founding it with any other. H. multicostata, (Buccinum cos- 
tatum, Linn.) and H. ventricosa, are among the most elegant in 
form and colouring, of the testaceous productions of the sea ; 
the former is rare. The recent species are not numerous, they 
inhabit the Indian Ocean. A fossil species occurs at Grignon, 
near Paris. Fig. 419, H. ventricosa. 
HAR’PAX. Parkinson; Puicaruua, Auct. 
HAR’PULA. Sw. A group of shells separated from Vo.uTa, 
Auct. Deser. “Shell generally tuberculated or longitudinally 
ribbed; apex of the spire papillary, smooth, and in general dis- 
torted ; pillar with numerous distinct plaits ; the upper, small and 
slender, the lower, thickest and shortest.” Type. H. Vexillum. 
(Voluta, Auct.) 
HAUSTATOR. Montf. A genus proposed to include those 
species of Turriretya, Auct. which have angulated whorls. 
