496 A. j. jukes-browne's supplementary 



Mesochilotoma striata, Seeley. 



Mesochilotoma striata, Seeley Ann. & Mag. Nat. Hist. ser. 3, 

 vol. vii. p. 284. 



The single specimen to receive which the above genns and species 

 have been proposed, is a small cast, not half an inch long, and 

 imbedded in phosphate, so that only one side of it is exposed to 

 view. 



It is, moreover, imperfect, both the apical and anterior portions 

 being broken off, so that only parts of four whorls are visible. The 

 onter lip is therefore not present, although Mr. Seeley describes it 

 as having " a notch which forms a keel round the middle of the 

 whorl ; " this keel he states to be crossed by the lines of growth ; 

 and perhaps it was from the evidence these would afford that he 

 presumed the outer lip to have been notched. 



These lines are not very distinct ; there is no doubt, however, 

 about the presence of the keel and of the faint striae above and 

 below it ; but in my opinion the keel bears a greater resemblance 

 to that on some forms of Aporrhais than to that of Pleuroiomaria. 

 Mr. Seeley believes it to have had a short canal ; but he adds, " I 

 have not yet seen the canal, and only predict its being short from 

 an examination of the broken uppermost whorl." 



Now, so far as such a small and badly preserved specimen enables 

 me to judge, I should be inclined to consider it the cast of a 

 small Aporrhais carinella, a species which has just such a median 

 keel with striae above and below. At any rate Mr. Seeley's 

 description would apply equally well to the shell above mentioned ; 

 and it is certainly much more likely to belong to this than to an 

 entirely new genus and species, for the existence of which no other 

 evidence is forthcoming. 



Brachtstoma angtjlare, Seeley, sp. 



Scalaria angularis, Seeley, Ann. & Mag. Nat. Hist. ser. 3, vii. 

 p. 286, pi. xi. fig. 9. 



Brachystoma angularis, Gardner, Geol. Mag. dec. 2, vol. iii. 

 p. 160, pi. iv. fig. 11. 



In 1861 Mr. Seeley described an imperfect cast in the collection 

 of Mr. J. Carter under the name of Scalaria angularis, one side 

 only of two whorls being visible on this specimen ; another frag- 

 ment in the "Woodwardian Museum exhibited the three uppermost 

 whorls of the spire. 



There was also in the Museum a fine and nearly perfect cast, 

 which, from the slight keel on the body-whorl, I supposed to be a 

 new species of Aporrhais ; and last year I obtained a second specimen, 

 but never suspected their identity with 8. angulans. Having, 

 however, sent one of these to Mr. J. S. Gardner, he forwarded me 

 a specimen from the Gault of Folkestone in which the shell was 

 preserved, asking me to compare it with the Cambridge casts, as he 

 suspected they all belonged to the same species. A careful inspec- 



