Mr. F. P. Marrat on a new Species o/Marginella. 141 



extended, cup-shaped head, with curved shaft. (This curved 

 kind of shaft is so common and so remarkable that it also is 

 very characteiisfac of GeodUes haldonensis, if not deservin- of 



Lf' w!Tf 'PT-fl'i f^^r]°''*^°";). ^'"- ^^- Tlje same as" the 

 Fin m J;^'*'/^^Muadnfid head, furcated irregularly,- variety. 

 -^?.V. t)9. Hexternate head; stout spicule. " -^ ' J 



'^' ^?,':"«*^. ^-^'-^n^l^d head; large spicule. Sfelkftites haUonensis. 



lUis spicule shows a very common occurrence in the deposit 



^thtv r :^iro? thf ;t uif '-'-' ^«^^ - -^' ^^^^^^-^-; 



torwaids; shaft and arms very much alike in many varieties • 

 J,, ^o """^^^'O^S' of many sizes. 2)e;T^^Wir/Won6^«,,^. ^^^"^^^es, 



J'tff. 72. Quatemate head, contracted, with long shaft: lateral view 



^ l^omphdesjmrvwejis. 

 Fig. 7H. The same, end view. 

 Fiff. 74. Lateral view of Gnmpldtes Parjittii. 



•'■ ca"narwhich"l'f'^'' 'V^'" '^' '""^^^'^ state of the axial 



canal which is frequently present in these fossil spicules: 

 ^.wallofspicide, very thin: hh, axial canal, much enlarged ' 

 ^ ^. ffi'ams ot sand m it ; d, end of spicule in it. ^ ' 



J^HI. /6. Specimen of the large, fusiform, smooth, slightly curved, acerate 

 spicule common in the deposit: a a, the pointed ends. Thi' 

 sizes i?''fi^' '•' ^'^^'^ •'^tundant, entire and fragmentary, of all 

 sizes. Ihe figure represents the average largest size, viz about 



to allow of the spicule being represented in its entire len-th 



ckHneard"^^^^^^^ ''"f''' T^ ''''' ^^^'^ «"^-^' '■-"bee" 



F>\, 77 T !, n ^ V '^"''' remarks apply to the following s.iicule 



an Ichb^'™ "'"''' 'l^^'^^*^' ^''''^"^' ^^'S' '^''' -fe"^^ 1-^Jth ;f 

 Mff. 78. Smaller acuate spicule. 

 F?ff. 79. Large contort bihamate spicule, Hsperites giganteiis. 



Xy.~On a Neiv Species o/Marginella from South Africa 

 By F. P. Marrat. ' 



[Plate XL fig. 13.] 

 Marginella Keenii^ Marrat, n. sp. 

 Shell conically ovate ; spire short ; whorls four, rounded, blunt 

 at the apex; colour orange-bufF, somewhat translucent- 

 columella with four sharply raised plaits; outer lip thick- 

 ened, smooth withm. ^ 

 Hah. South Africa. 



I have named this shell after my friend Mr. Keen, of Edtre 

 Lane, Liverpool, to whom the specimens (six in nuiber) be- 

 ISresufrgirn^^^^ of ^..,.... is considered I be 

 100 Edge Lane, Liverpool. 



