376 pleurotomidte. 



did not notice either the canal at the base or the notch in 

 the outer lip, and his description might serve for Risso- 

 ina, species of which he in fact included in Mangelia. 



A. Inoperculated. 

 1. Pleurotoma striola'ta"*, (Scacchi) Philippi. 



P. striolatum, Phil. Moll. Sic. ii. p. 168, t. xxvi. f. 7. Mangelia strio- 

 lata, P. & H. iii. p. 483, pi. cxiv. A. f. 1, 2. 



Body white, minutely and closely speckled with flake-white, 

 and marked with 8 or 9 bright pink spots on the pallial tube, 

 which is short and rather open or scoop-shaped : tentacles short 

 and thread- shaped above the eye-stalks : eyes placed very near 

 the tips of the tentacles : foot truncated in front, very slightly 

 auricled at the corners, and tapering behind to a point ; the 

 sole has no medial groove. (Clark.) 



Shell slender, rather solid, semitransparent, not glossy, 

 except in dead and rubbed specimens : sculpture, flexuous and 

 prominent longitudinal ribs, which are remarkably high- 

 shouldered or angulated at the top of each whorl, and extend 

 to the suture and base ; there are 9 or 10 on the body-whorl, 

 and one less on the penultimate whorl, decreasing at the same 

 rate upwards ; the whole surface (with the exception of the 

 apex) is traversed by fine and numerous spiral striae, which 

 are discernible with a low magnifying-power, but not by the 

 naked eye ; the third whorl is marked with numerous longi- 

 tudinal striae, besides the spiral striae (which latter are stronger 

 than usual), but there is no appearance of reticulation ; the first 

 and second whorls are smooth and glossy : colour buff or pale 

 yellow, sometimes variegated by several obscure and narrow 

 bands of reddish-brown; and occasionally the periphery is 

 encircled by a broader purplish band, and the upper part of 

 each whorl (just below the suture) has a second band of a 

 purplish hue : spire long, tapering, and turreted ; apex some- 

 what mammiform, but not having the peculiar character of 

 any Defrancia : ivhorls 9, moderately convex, angulated by the 

 ribs ; the last whorl occupies rather more than one-half of the 

 shell : suture deep : mouth contracted, exhibiting the labial 

 notch near the upper part ; length five-twelfths of the shell : 

 canal rather long and wide ; basal notch obliquely rounded : 



* Slightly striated. 



