C 1{ A N () PS 1 S AND / !-: 1 1) H A. 



Genus CI;ANI)1>SIS, .1. A,lam<. 

 Testa capiilifoi-mis, f.rtus canceUata ; apicc recvrrn, i 

 tegro ; fissura in medio posita, inter apicum 

 marginem anticum, fornice interno etrevato. 

 Shell cap-shaped, cancellated outside ; apex recurve 

 entire ; fissure placed mid\7ay between the ap 

 and the anterior margin, internal vault arched. 

 The only two sj)ecies known of this genus are fr< 

 Japan. The position of the foramen is the same as 

 the preceding genus, Rimiiia .- but, unlike that genus, 

 has the internal vaulted septum of Cemoria. 



"P" 



'titil, postiix tainiiid septifonni. tr 



Species 1. (Fig. a, 4, Mus. Brit.) 

 CuANOrsis I'li.EOLUS. Cra. testd pileiformi, co.'itellis 

 radiuntibiis crciiuliitis ; apicc postice valde inmr- 

 vato ; Jifsura antiee acuta ; margine postice rejlexu ; 

 dorsu plamilatim qtiasi-carinato. 

 The c.\p-sh.\ped Chanopsis. Shell cap shaped, with 

 creuulated radiating riblets; apex much incurved 

 jiosteriorly ; fissure anteriorly sharp ; margin ])os- 

 tcriorly reflected ; back with a kind of flattened 

 keel. 

 A. Akams. Sowerby's Thesaurus. Fissundlida', ('ra- 



niipsis, sp. 1 , fig. 1, '1. 

 Hah. Mino-Sinia, .hipan. 



Tlie apex of this shell is coiled and extends pos- 

 teriorly a little beyond the margin. 



Species 2. (Fig. a, h, l\Ius. 15rit.) 



Cranopsis telex. Cra. testa coniea, aruminal,). ros- 

 tellis radiantihis et liris mimilis roncenlricis caii- 

 cellatd ; apice actiminato, recurvo, dorso dutice 

 posticiqiie declivi. 



The helmet-shaped Chanopsis. Shell conical, acumi- 

 nated, cimcellated with radiating riblets and 

 minute concentric ridges ; apex acuminated, re- 

 curved, back sloped anteriorly and posteriorly. 



A. Adams. Annals and Magazine of Natural History 

 for 1860. 



Hab. Mino-Sima, Japan. 



Genus ZEIDORA, .1 . Adams. 

 Testa patellifonnis, ohlonga, depressa, extiis canccllata ; 

 apice post-marginali ; margine antico Jtssurato .■ 

 Decei 



mhtrignnd dieiso. 

 Shell patelliform, oblong, depressed, cancellated on th 

 outside ; apex post-marginal, anterior margii 

 fissured; aperture ovate, posteriorly divided by; 

 septifonu, transverse, somewhat trigonal lamina. 



e comparatively 

 lame of Arthur 



The Zeidorce, like the Cranopsid(^, a 

 recent discoveries associated with the 

 Adams and with the shore.s of Japan. Having a septiform 

 plate, like that of Grepidula in form, but perhaps more 

 analogous to the small vaulted lamina under the foramen 

 in Cemoria, and yet having the marginal slit of Eiii.ar- 

 ginula, this curious little genus affords an interesting 

 example of the ever-varying forms of Nature. 



,v.s pni. 

 emtlatd 



Species 1. (Fig. <7, h, Mus. Brit.) 



Zeidoua inrnri-r.ArA. X:i.ti.-1ii oh/inigd, dor.s(. 

 liiiei.-! ckrati.-< radiai,til)ii.< ct ///v'.s- coiiceiil, 

 fheiTime decussatd ; apcrturd margine <■ 

 Jl.<sni-d marginali angustd, oblongd. 



The i:ETicuL.\TEn Zeidora. Shell oblong, back convex, 

 very beautifully decussated with raised radiating 

 lines and concentric ridges ; aperture cienulated 

 at the margin ; marginal tis.sure narrow, oblong. 



A. Adams. Ann. and Mag. of Nat. Hist. 



Ihih. Mino-Sima, Japan. 



The form is more convex and the fissure more narrow 



and deeply cut than in the next species. 



I Species 2. (Mus. I'.rit.) 



I ZElDOltA CALCEOLINA. Zei. t/.^ld ohlovgd, depres.10' 

 t conrerd, costelli.< radiantdiii.<; et liris conren/riris 



eleganter canccllntd ; sulco mediaim laterilms ele~ 

 1 vatis ; apice poslici dejlexo. seplo maigin, ihiiln, 



integro. 

 The slipper Zeidora. Shell ..Mong. depressed-convex, 

 elegantly cancellated with radiating riblets and 

 concentric ridges ; middle sulcus with elevated 

 sides; apex bent down posteriorly; septum with 

 a sharp, entire margin. 

 j A. Adams. Ann. and Mag. ,if N.at. Hist., 18(10. 

 Hah. Mino-Sima, .lapan. 



The dorsal groove forms a sort of bmad double-edged 

 keel, pitted lietween the two edges, 

 her, 187;^. 



