MELO PEEVETUS. 35 



Colostracon Lewisii Fraas sp. 



Plate III, figs. 5 a, b. 



Globiconcha Lewisii Fkaas, 187S, Atis dem Orient, II. Theil, p. G5, 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 Globiconcha ; but if that 

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

 doubtful,* this surely is not a sjiecicb" 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. Lange init zarten Liingsstreifen und noch zarteren Querstreifen ver- 

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

 vertieft und nabelfdrmig eingedriickt, wodurch die Muschel ein hochst eigen- 

 thiimliches Aussehen gewinnt." (loc. cit.) 



Locality and Position. — Abeih; from the Turonian Gasteropod zone. 



Melo pervetus Conrad sp. 



Plate III, He. 6. 



S/romb US pervetus Conrad, 1852, OiBcial 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, 63 mm. 



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

 cisely the same pTOportions 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. 410) ; " When lately at Paris I en- 

 deavored to Und out from d'Orbigny's collection in the Jardiu des Plautcs the real signification of tlie name 

 Globiconcha, but I turned away disappointed, not being able to arrive at any reasonable conclusion. Not cue 

 of the specimens named by d'Orbiguy is a perfect shell, but all imperfect casts, which can be variously com- 

 mented upon. Some of Ilium have been shown to belong to Ci/preea ; others appeared to me to represent 

 casts of Ti/lostoma, Natica, and probably of Oiiudia. There have been, however, by subsequent authors, 

 various globular shells described uuder the name of Globiconcha, and of these some very much resemble 

 Bullinula and Hi/datina." 



Zittel (Ilandbucli dcr Palseoutologie, I. Baud, 2. Abtheilung, j). 296) records the genus uuder the family 

 Bullidce, in this doubting style: "? Globiconcha d'Orb. Auf unbestimmbare Steinkerue von ansehuhcher 

 Grosse aus Kreidcublageruugeu basirt, welche wahrscheinlich zu verschiedeneu Gattuugeu gehoreu." 



