96 MURE*. ROCK-SHELL. 



rows on the next : length hardly a quarter of an inch ; 

 breadth one eighth. 



On the Scotch coast : very rare. 



22. Murex reticulatus. Reticulated Rock-shell. 

 Da Costa, pi. 8. f. 13 Dorset Cat, pi. 14. f. 13. 



Shell long, slender, tapering to a very fine point, rufous- 

 brown : spires eleven or twelve, hardly raised, reticulate 

 by longitudinal and transverse striae, giving them a tuber- 

 cled appearance ; each volution with four rows, and the 

 body volution four other strong transverse lines at the base 

 which are not cut across by longitudinal ones : aperture 

 roundish*oval, ending in a very slight canal : outer-lip a 

 little crenate by the spiral ridges : length about half an 

 inch ; breadth hardly an eighth. 



Dredged and drifted sand. v. v. 



23. Murex tubercularis. Tubercled Rock-sheU. 

 Montagu, p. 270. 



Shell slender, taper, pointed, chesnut-brown: spires nine, 

 or ten, hardly raised, each with three rows of tubercles, 

 which are equal in size throughout the shell : aperture 

 small, oval, ending in a canal, somewhat closed by the pil- 

 lar turning inwards : length a quarter of an inch. 



Variety. Quite white and semitransparent. 

 Drifted sand : rare. v. m. 



24. Murex subulatus. Needle Rock-shell. 

 Montagu, pi. 30. f. 6. 



Shell very slender, white : spires about fifteen, hardly 

 raised, defined by a purplish-brown line, each marked with ' 

 two rows of bead-like tubercles divided by a depressed line, ! 

 in which are observed minute raised lines in a contrary di-j 

 rection : aperture small, with a short canal turning to the 

 left; the base without tubercles and dark-brown: length j 

 three-eighths of an inch. 



In the sound of Mull : very rare. 



25. Murex fuscatus. Brown Rock-shell. 

 Pennant, pi. 85. f. \-Linn. Trans, viii. pi. 4. f. 6. " 



Shell tapering to a fine point, yellowish-brown : spires 



ten 



