MELO PERVETUS. 35 



Colostracon Lewisii Fraas sp. 



Plate III, figs. 5 a, b. 



Globiconchu Lewisii Fraas, 1878, Aus dem Orient, II. Theil, p. 65, PI. vi, figs. 5 a, b. 



This species clearly belongs to the same genus as the last two, presenting 

 the strong generic characters of the group, yet with differences which sepa- 

 rate it specifically from the others. Fraas terms it a Globiconchu ; but if that 

 genus can be said to have been intelliglibly characterized, which is at least 

 doubtful,* this surely is not a species of the genus. 



Having never seen the fossil itself, we copy Fraas's figures and his very 

 brief description of the species, which is as follows : " Eine Muschel von 

 23 mm. L'ange mit zarten Langsstreifen und noch z'arteren Querstreifen ver- 

 sehen und einem inneren Canal. Die Windungen, 3-4 an der Zahl, sind 

 vertieft und nabelformig eingedruckt, wodurch die Muschel ein hochst eigen- 

 thiimliches Aussehen gewinnt." (loc. cit.) 



Locality and Position. — Abeihj from the Turonian Gasteropod zone. 



Melo pervetUS Conrad sp. 



Plate III, fig. 6. 



S trombus pervetus Conrad, 1852, Official Report, p. 221, PI. xiii, fig. 73. 



Single specimen, an interior cast, imperfect, but exhibiting very nearly 

 the original outlines. Length, not much abridged, 103 mm. ; width, some- 

 what increased by depression, G3 mm. 



Though this is much smaller than the specimen figured by Conrad, pre- 

 cisely the same proportions of spire and body whorl, and the same sutural 

 angle, appearing in both, their specific identity seems altogether probable. 



* Stoliczka remarks (Cretaceous Gastropoda of Southern India, p. -llo) : "When lately at Paris I en- 

 deavored to find out from d'Orbigny's collection in the Jardin des Plantes the real signification of the name 



Globiconchu, hut I turned awaj disappointed, nol being able to arrive at any reasonable i elusion. Not one 



of the specimens named bj d'Orbigny is a perfect shell, but all imperfeei casts, which can lie variously com 

 inented upon. Some, of them have been shown to belong to Oi/praa ; others appeared to me to represeni 

 casts of Tylostoma, Natica, and probably of Cinulia. There have been, however, by subsequent authors, 

 various globular shells described under the name of Globiconcha, and of these some very much resembli 

 Bullitmla and Hydatina." 



Zittel (Handbuch der Palceontologie, 1 Band, :.'. Abtljeilung, p 296) records the genus under the family 

 Bullid(c,'m this doubting stylo: " ? Globiconcha d'Orb, Auf unbestimmbare Steinkerne von ansehnlicher 

 Grosse aus Kreideablagerungen basirt, welche wahrscheinlich zu verschiedenen Gattungen gehoren." 



