C A L Y P T R .E A 



Plate Y. 



Species 16. (Tig. 16 a aod 16 6, Mus. Cuming.) 



Calyptk.ea scabies. Oalyp. testa traH^verse ovatd, pa- 

 rum convexd, con pen trice rugosd, mblamellatd, radia- 

 lim minutissime striata, vertice ohluso, subpostico ; ap- 

 pendice interna parvd, hreviasimd ; albd, extiis sordide 

 fulvescenle. 

 The scab Calyptr.«a. Shell transversely ovate, but 

 little convex, concentrically rugose, siiblamellar, ra- 

 diately very minutely striated, top obtuse, somewhat 

 posterior ; internal appendage small, very short ; 

 white, exterior dull-fulvous. 

 Hab. Philippine Islands ; Cuming. 



The internal appendage in this species is somewhat ob- 

 scurely developed. 



Species 17. (Fig. 17 o and 17 4, Mus. Cuming.) 

 Calyptr^a uncinata. Cahjp. testd depresso-pileiformi, 

 tentii, snbcorriii/atd, radiatim dense minutissime striata, 

 vertice postico, acute depresse tmcinato; pellncido-albd, 

 hyaliud ; appendiee interna obliqnd, prominente. 

 The hooked Calyptrjja. Shell depressly cap-shaped, 

 thin, slightly wrinkled, radiately densely very mi- 

 nutely striated, top posterior, sharply depressly 

 hooked ; transparent-white, hyaline ; internal appen- 

 dage oblique, prominent. 

 Hab. Island of St. Thomas, West Indies. 



A hyaline, sharply-hooked, rather depressly cap-shaped 

 shell, from the West Indies, composed of the same mi- 

 nute thread-rayed tissue as the Philippine Island species. 



Species 18. (Fig. 18 a and 18i, Mus. Cuming.) 

 Calyptr/Ea coerugata. Calyp. testa suborbiculari, de- 

 pressd, medio conoided, radiatim striata et costato- 

 corrugatd, prope maryinem subsquamato-fimiriatd, 

 deinde rejlexd, vertice subrecto, obscure uncinate; albd, 

 versus marginem sordide fuscescente ; appendiee in- 

 ternd subampld, latd. 

 The wrinkled Calyptr.-ea. Shell nearly orbicular, 

 depressed, conoid in the middle, radiately striated 

 and rib-wrinkled, slightly scale-fringed near the 



margin, then reflected, top nearly straight, obscurely 

 hooked ; white, dull-fulvous towards the margin ; in- 

 ternal appendage rather large, broad. 



Broderip, Trans. Zool. Soc. vol. i. p. 197. pi. 27- f. 2. 



Hab. Guacornayo, Central America (under stones at a 

 depth of fourteen fathoms) ; Cuming. 

 A fine depressly-spread conoid shell, sculptured with 



rib-like ^VTinkles radiating from the centre, and at the 



margin becoming slightly fimbriately scaled. 



Species 19. (Fig. 19 « and Vib, Mus. Cuming.) 



Calyptr.oEA ossea. Calyp. testd orbiculari, depressd, 

 medio conoided, pellucido-albd, hyalind, radiatim dense 

 striatd, striis subconspicuis, vertice postico, acute tm- 

 cinato ; appendiee internd obliqud, prominente. 



The bone Calyptr.ea. Shell orbicular, depressed, co- 

 noid in the middle, transparent-white, hyaline, ra- 

 diately densely striated, strise rather conspicuous, top 

 posterior, sharply hooked; internal appendage ob- 

 lique, prominent. 



Hab. Island of Burias, Philippines ; Cuming. 



A very transparent depressly-spread species, in which 



the radiating striee have a somewhat lattice-ridged aspect. 



Species 30. (Fig. 20 a and 20 6, Mus. Cuming.) 

 Calyptr^a porosa. Calyp. testd orbiculari, elevato- 

 conicd, pileiformi, undique dense reticulato-corrugatd, 

 porosd, albd, vertice postico, minute acute uncinato ; 

 appendiee interna subarcuatd. 

 The porous Calyptr^a. Shell orbicular, elevately co- 

 nic, cap-shaped, everywhere densely reticulately wrin- 

 kled, porous, white, top minutely sharply hooked, 

 internal appendage slightly arched. 

 Hab. Australia; Strange. 



Like all Australian forms, there is something extremely 

 characteristic about the species. The entire surface of the 

 shell is shrivelled, so to speak, into a close network or 

 honeycomb of wrinkles, the tissue of the shell being still 

 composed of radiating thread-like stria?, as in all the typi- 

 cal species of the genus. 



Deceoiber, 1858. 



