170 MALACOZOA. GASTEROPODA. PECTINIBRANCHIATA. 



3. Fusus Laskeyi. Laskey's Spindle-Shell. 



Shell ovato-turrite, subfusiform, rather thick, covered with 

 a thin greyish-yellow epidermis ; the spire tapering to a small 

 but obtuse point ; the whorls convex, the last broader than the 

 length of the spire, with five prominent, compressed, rounded 

 longitudinal ridges, alternating with smaller ridges, and having 

 on its rather flattened sloping posterior space two small 

 ridges ; on the other turns five ridges apparent, one of them 

 much larger and medial ; the turns transversely marked with 

 fine rather deeply impressed striae, rendering the ridges crenu- 

 late ; the aperture roundish-ovate, with a narrow canal taper- 

 ing to a point ; the inner replicate and smooth. Length three- 

 twelfths of an inch, breadth nearly two-twelfths. 



Two specimens found by Mr. Alexander Davidson, in the 

 Winter of 1841, among substances brought up from deep water 

 off Aberdeen. One of them, the smallest, agrees in all respects 

 with that figured by Capt. Laskey in the first volume of the 

 Wernerian Transactions; the other, much larger, is as de- 

 scribed above. Both have the outer lip unformed, being thin, 

 with the ridges running out upon it, and producing notches in 

 their intervals ; and the larger has the mouth somewhat dis- 

 torted by a meAded fracture. Captain Laskey believed it to 

 be the young of Fusus carinatus, which however it does not 

 appear to be. I have therefore given it a different name. 



Murex carinatus. Laskey, Wern. Mem. i. 400. PL 8. f. 9. 



4. Fusus Buchanensis. Buchan Spindle-Shell. 



Shell fusiform, rather thick; with the spire tapering to a 

 small nipple-shaped point ; the whorls six, moderately convex, 

 with prominent obtuse strong ribs, separated by wider concave 

 spaces, and nodulose by the decussations of the strong spiral 

 raised lines ; the last turn with twelve ribs, the two first ribless 

 and glossy ; the suture distinct ; the aperture narrow-oblong, 

 nearly half the entire length, the canal moderate, narrow, 

 straight, the outer lip thickened by a rib and crenate ; the 

 colour dull grey, the spiral striae and nodules of the ribs dusky, 

 the tip of the spire pale brown. Length three-twelfths of an 

 inch, breadth a third of the length. 



The above description from a specimen found by Miss Mac- 

 gillivray, in shell sand, from the Bay of Cruden, sent by Mr. 

 Alexander Murray, in November, 1842. It comes very near 

 to Pleurotoma Smithii, from which however it differs in having 

 the aperture proportionally longer, and the canal much nar- 



