70 PROCEEDINGS OF THE ACADEMY OF [1890. 



Murex ternispina, Lam. (Fig. 7). 



The nucleus consists of one and a half brown whorls ; a carina 

 begins near the end of the last embryonic whorl and runs into the 



a lowest spiral thread of the succeeding whorl ; this carina 

 is a very faint thread and is scarcely noticeable unless 

 looked for very closely ; the lateral outline shows a very 

 Fig. 7. decided rounded appearance ; the extreme point of the 

 embryonic whorl is a little depressed and bent down on one side. 



There is no varix at the end of the embryonic whorl ; the suc- 

 ceeding ribs commence gradually even before the end of the em- 

 bryonic whorl, and slowly increase in .size until the spinose varices 

 appear upon the fourth whorl ; there are nine ribs to each whorl 

 and these are crossed by four fine, spiral lines ; the suture between 

 the embryonic whorls is impressed. 



This species is separated from its congeners by the presence of a 

 thread-like carina near the ending of the embryonic whorl. 

 Murex tenuispina, Lam. (Fig. 8). 



The embryonic nucleus consists of two faintly yel- 

 lowish-white whorls ; the carina is quite close to the 

 suture of the whorl below and is almost concealed. 

 The varix at the end of the nucleus is small and 

 Fig. 8. rounded ; this is followed by close set, rounded ribs 



which continue until the spinose varices appear upon the fourth 

 whorl ; there are nine of these ribs to each whorl crossed by four 

 fine, spiral lines ; the suture between the embryonic whorls is im- 

 pressed. 



This species is separated from Murex brevispina Lam., by the less 

 rotund outline of the first embryonic whorl and by the outline of 

 the second being straight instead of rounded as in brevispina. 



Hurex recurvirostris, Sowb. (Fig. 9). 



The nucleus consists of about one and a half rounded, polished, 

 brownish whorls, of which the second part is but little larger in out- 



Aline than the first ; a lateral view of the outline shows 

 a rounded appearance; the top of the first part of the 

 whorl is rounded ; the tip of the embryonic whorl is 

 depressed and a little bent down on one side ; a carina 

 Fig. 9- commences near the last half of the apical whorl and 

 runs into the lowest spiral thread of the succeeding whorl. 



The varix at the end of the embryonic whorl is scarcely larger 

 than the succeeding ribs ; after the varix the whorls continue to be 



