CRETACEOUS FOSSILS. 165 



ANCHURA, Con. 

 A. FALCIFORMIS, Gabb. 



(Aporrhais falciformis, Gabb; Pal. Cal., Vol. 1, p. 127, pi. 20, fig. 83.) 



Subsequent discoveries show that the canal of this shell is very long and straight. 

 From being extremely slender, it is rarely preserved. One specimen from Chico 

 Creek has an aperture, including the canal, as long as the spire. All of the species 

 described in the above work as Aporrhais, belong to the genus Anchura. 



Following the custom of nearly all writers on the subject, I have there and else 

 where, heretofore quoted Aporrhais as a genus of Petiver, Dacosta, &c. Recently 

 having had my attention specially called to the subject, I investigated the history 

 of the generic name anew for myself, and have published the result of my study 

 in the American Journal of Conchology, 1868, page 143. Neither Aldrovandi, 

 Petiver, nor Dacosta, ever knew the name as connected with the true Aporrhais. 

 They all applied it to various species of Pterocera ; a good opportunity for some 

 conchological revolutionist to make another "restoration," and quote Pterocera 

 as the genus Aporrhais of Aristotle, Aldrovandi, et id omne genus. 



A. TRANSVERSA, n. 8. 

 PI. 27, Fig. 45. 



SHELL small, fusiform, spire elevated; whorls rounded, their 

 number unknown, suture deep. Surface of upper whorls, and 

 upper part of body whorl, strongly cancellated by longitudinal 

 and transverse ribs ; body whorl strongly carinated near the lip, 

 the carina running out, and forming a sort of midrib or keel to 

 the lip. Lip long, transverse, curved upwards, the upper margin 

 regularly concave, tip acute, lower margin broken ; canal long, 

 straight. 



Length unknown ; about .7 inch ; width of body whorl, .2 inch ; including 

 length of lip, .5 inch. 

 From the Martinez Group, Martinez. 



