284 Mr. H. Seeley on Cambridge Paleontology : — 



canal. Whorls rapidly enlarging, about twice as wide as high, 

 inflated ; ornamented on the most inflated part with two 

 keels, between which the shell is concave ; the upper one is 

 most prominent ; they are about as widely separated as the 

 whorl above is high : on the space between the upper one 

 and the suture, which is wider than that between the keels, 

 there is a third rib, wide and obtuse. Anterior to the lowest 

 one is a fourth, much less elevated than the others. These 

 ribs are crossed longitudinally by numerous costse moderately 

 elevated. Mouth ovate. Canal ? 



This species is intermediate in form between the F. trunculus 

 (P. & R.) and F. hilineatus (P. & E., not Partsch) : from the 

 former it is distinguished by the more elongated form, from the 

 latter by being more inflated, and from both by the keels. 

 Coll. J. Carter, Esq. ; University Museum. 



Fusus quinquecostatus. PI. XI. fig. 5. 



Shell fusiform ; spire elevated, about one-third the length of the 

 shell exclusive of the canal, composed of three whorls, which 

 regularly enlarge, are round, and twice as wide as high. The 

 body-whorl is gently inflated, elongated, and ornamented 

 with five strong keels, which are equally wide apart and sepa- 

 rated by spaces half as broad as the whorl above is high ; 

 the second, on the widest part of the shell, is most promi- 

 nent. Between the keels the shell is concave. Mouth some- 

 what elongated. Canal ? 



The species is easily distinguished from every other Cretaceous 

 form by its elongated shape, rounded whorls, and five costae. 

 Very rare. Coll. University and J. Carter, Esq. 



Mesochilotoma. 



Regularly spiral, turreted, with a short canal (?) *. Outer lip 

 with a notch, which forms a keel round the middle of the 

 whorl, as in Pleurotomaria, &c. 

 This genus belongs to the Conidse, and should be placed 



immediately after Pleurotoma. 



Mesochilotoma striata. 



Small, greatly elongated. Whorls enlarging rather gradually, 

 twice as wide as high, convex, impressed at the sutures. The 

 keel is rather narrow, but elevated ; it is crossed by the lines 



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

 an examination of the broken uppermost whorl. 



