CI II C E . 



Plate V. 



Species 20. (Fig. a, h, c, Mus. Cuming-.) 



Circe pectinat.*.. Circ. testa oliJongo-omVi, cowpressd, 

 postice mhquadratd, alhidd, rufo-fiisco conceiiirice 

 maculatd et pvndald, radiaiim. costatd, cost is irregu- 

 larihiis, nochso-yraiiatis, versus margiiiem hijurciitis, 

 latere postiro ilivaricntim lifitrcatiiii pticato. 



The comh-like Circe. Shell oblong-oval, compressed, 

 po.steriorly somewlirit square, wliitisli, coneenfrically 

 blotc-lied aud dotted with red-brown, radiately ribbed, 

 ribs irrcg-ular, nodosely gi-ained, bifurcated towards 

 the margin, posterior side divaricately bifiu'cately 

 plaited. 



Venus pectinata, Linnfeus, Syst. Nat. p. 1135. 

 Cytherea •pectinata, Lamarck. 

 Circe peciinata, Gray. 

 Ci/tlierea Sar/ffiij/i, Jonas. 



Hab. Eed Sea, Philippine Islands. 



This well-known species is typically of a compressed 

 form, but it varies considerably and passes into the gib- 

 bosity of the next species. The sculpture is finer and 

 more elaborate. 



Species 31. (Fig. a, 1), c, d, JIus. Cuming.) 



Circe gibba. Circ. tesld ohlnngo-nvald, crassd, valde 

 gihijosd, postice parum quad raid, nlhidd, iiiterdiim.fer- 

 riiginen linctd, riifo-fiisro nut nigra poslici el versus 

 umlioiies maculatd, radiatim costatd, coslis irrei/idari- 

 lus, rude noduso-grunatis, ad marginem inlerdum. hi- 

 furcatis, latere postico divaricatim hifnrcatim. plicalo. 



The gibbous Circe. Shell oblong-ovate, thick, very 

 gibbous, posteriorly but little square, whitish, some- 

 times tinged with rust, spotted posteriorly and to- 

 wards the umboes with red-brown, or black, radiately 

 I'ibbed, ribs irregular, rudely nodosely grained, some- 

 times bifurcated at the margin, posterior side divari- 

 cately bifurcately plaited. 



Ci/llierea gibha, Lamarck, Anim. sans vert. vol. v. p. .577 

 CgtJierea rauella, Lamarck. 

 Circe gibba. Gray. 



Eab. Eed Sea, Philippine Islands, Australia. 



Of a very solid gibbous gi-owth compared with the 

 preceding species, much more rudely sculptured, the ribs 

 being strongly nodosely grained, deeply excavated in the 

 interstices. 



October, 18(i3. 



