90 BEV. E. BOOa WATSON ON THE 



II. Those in which the longitudinal ribbing of the apex is 

 notable. 



1. Apex somewhat stiliform. 



(4) C. Barleei, Jeffr. 



(5) G.fai/alensis, Wata. 



2. Apex not stiliform. 



(6) O. tiara, Wats. 



III. Those in which the spiral threads of the apex are notable. 



(7) G. GlarJcii, Forb. & Hanley. 



IV. Those in which the apex has ribs and one or more spirals. 



(8) G. diadema, "Wats. 



(9) G. atalaya, Wats. 



V. Those in which the apex is fretted or reticulated. 



(10) G. Metaxce, Chiaje. 



(1) C. TUBERCULABis, Mont. Test. Brit. p. 270 (Murex). 

 Has a small elongated apex, which is in form slightly conical, 



but more nearly cylindrical, consisting of four small, perfectly 

 smooth, convex whorls parted by a horizontal slightly impressed 

 suture ; the tip is rounded and immersed. On the base of the shell 

 is a circumbasal thread separated from the tubercled threads on 

 the side of the body-whorl by a deep narrow furrow ; another 

 thread encircles the base of the pillar ; between these threads is 

 a broadish shallow basal furrow ; on the pillar near its foot and 

 behind the lip-edge is more or less of a twisted swelling (the scar 

 of the old canal) simulating a thread. 



JSah. Great Britain to Madeira and the Mediterranean. 



(2) C. Jeffbetsi, Wats. (=C. pulchella, Jeffr. Ann. Sf Mag. 

 Nat. Hist. 3rd ser. vol. ii. p. 129, pi. v. fig. 8, but name preoc- 

 cupied by 0. B. Adams). 



Is in general form of straighter outline than G. tubercularis, 

 Mont. ; the individual whorls are more convex ; the longitudinal 

 ribs and the spiral threads are finer, and the tubercles at their 

 intersections smaller, with much larger open square interstices ; 

 the embryonic apex, which is also perfectly smooth, is a little 

 smaller and narrower, in particular the third and fourth whorls 

 are narrower and less tumid, and the suture is more oblique. 

 On the subcorneal and not depressed base there is only one feebly 

 tubercled thread, and it is circumbasal ; within it are radiating 

 lines ; a scar of the old canal encircles the pillar a little above its 

 foot ; the pillar is rather long and narrow. 



