Cretaceous Fossils of Aberdeen. 251 



Lamellibranchiata. 



Astarte (Venus) striato-costata, Forbes. — There are several small 

 specimens of an Astarte with few and strongly-marked i-ibs, which 

 without doubt are the same as some from the Lower Greensand in 

 the Museum of Practical Geology, and there is no question as to 

 these being the forms called by Forbes Verms striato-costata. One 

 of the Moreseat specimens, however, shows a very definite lunule, 

 and the margins of the shell are crenulated ; so that its reference to 

 Astarte seems to us necessary. The correctness of Forbes' reference 

 of these to Astarte striato-costata of D'Orbigny may be open to 

 doubt, but for the present that name is retained. 



Trigonia vectiana, Lye. — Two or three small pieces of a Trigonia, 

 which so far as they are preserved agree better with Trigonia 

 vectiana than with any other form, are referred to that species. 



Goniomya, sp. — One fragment of a Goniomya has been detected ; 

 but while there is no question as to the genus, it is not sufficient for 

 specific determination ; it might be Goniomya Villercensis, a doubtful 

 example of which is in the Cunnington Collection in the Museum of 

 Practical Geology. 



Cyprina Fergusoni, Salter. — Many fragments appear to us to 

 represent Salter's species, the type of which has been compared ; 

 but with them there are portions of another form, having similar 

 thread-like markings, but a different outline, and these we refer to 

 the following genus. 



Lncina, sp. — Several fragments, and one or two nearly perfect 

 moulds of the exterior, indicate the genus Lucina. The markings 

 on these specimens are fine, concentric thread-lines, so like those 

 of Cyprina Fergusoni that it is uncertain to which genus many 

 fragments belong. The more perfect examples, however, have less 

 prominent umbones than Cyprina Fergusoni, and they overhang the 

 lunule ; the entire shell is nearly orbicular. We have been unable 

 to refer this definitely to any described species ; the markings are 

 similar to those of Lucina Dupiniana of D'Orbigny (pi. eclxxxi), but 

 the produced anterior extremity of that shell, and its prominent 

 umbones, are unlike ours. There are some specimens from the 

 Upper Greensand, in the Museum of Practical Geology, somewhat 

 resembling these Moreseat specimens, which have been doubtfully 

 referred to Lucina Dupiniana. 



Cucullcea carinata, Sby. — This is, perhaps, the most abundant fossil 

 among the Moreseat specimens, and occurs both as internal and 

 external casts, the largest being a little more than an inch long ; 

 it seems to us to agree with the true C. carinata, the strong ribs 

 both at the front and back of the shell being of uniform size and 

 not as described in Cucullcea securis, D'Orb., which is one of the 

 forms occurring at Speeton. 



Cardium Raulinianum, D'Orb. — Two or three examples of a finely- 

 striated Cardium, about half an inch in diameter, are referred to this 

 species. 



