296 INVERTEBRATA OF MASSACHUSETTS. 



are represented in " Ellis's Corallines," t. 33, f. b. When the em- 

 bryo is sufficiently mature, the young escape through an opening in 

 the edge, opposite to that where the ligament is attached. 



Py'rula ca'rica. 



Shell large, solid, pear-shaped, syire not turreted, suture not 

 channelled, having a series of the triangular, compressed tubercles 

 just above it, and encircling the most prominent part of the body 

 whorl ; canal long and Jlexuous. 



State Coll., No. 22. Sec. Cab., No. 31S. 



Murex carica, Gmelin ; 3545, No. G7. Lister; Conch., 880, f. 3 b. Gualt.; 



Test., t. 47, B. Martini ; Conch., iii. t. CD, f. 744, 750. Knorr; Vergn., vi. 



t. 27, f. 1. 

 Py'rula carica, Brug. ; Encyc. Mdlh., pi. 435, f. 5. Lam., Jin. sans Vert., (1st 



ed.) vii. 138. Adams; Bost. Journ. JVat. Hist., ii. 209. 



Shell large and thick, ovate pear-shaped, ash-colored ; whorls 

 six, the lowest large and capacious, broadest at its posterior fifth 

 where it is crowned by a series of compressed, triangular no- 

 dules, one at each stage of growth ; the spire suddenly slopes 

 backwards from these to the suture, which is well defined, but not 

 channelled ; the spire is a low cone, pointed, the series of nodules 

 encircling the base of each whorl ; below the nodules the lower 

 whorl gradually diminishes and extends into a long, conical beak ; 

 surface distinctly marked by an elevated ridge of a darker color at 

 each stage of growth, and by revolving lines alternately larger and 

 smaller ; aj)erture long ovate, angular at its junction behind, 

 where a canal is formed by a protuberance of the opposite mar- 

 gin ; outer lip simple, sharp, regularly curved to the extremity of 

 the beak, or slightly arched at the middle, not otherwise con- 

 tracted at the commencement of the canal ; pillar lip flexuous, 

 concave above, and to the beginning of the canal where it twists 

 outwards, causing a bluntly rounded projection, and forming the 

 inner margin of the canal, which is gently curved upwards, and to 

 the right ; interior bright brick-red or light fawn-color ; opercu- 

 lum unguiform, apex at one end, inner side of a wax-like texture, 



