On tieiv Species 0/ Cerltliium, d:c. 237 



M. proscorpio^ Latr. A spine is present below at the distal 

 end of tlie tibiaj of the thiid and fourth legs. 



Colour. — Trunk dark biown above; its ventral surface is 

 usually a little paler, and the cox?e of the legs and the middle 

 part of the first sternite are reddish. Palp dark brown. 

 Proximal segments of legs, including the femora, rather dark 

 brown or dark reddish brown above ; the distal segments 

 reddish. 



Measurements in min. — Len<rth of trunk 55"5, of cara- 

 pace 22'5. 



Material. — Aljout forty specimetis, including numerous 

 adults of both sexes ; collected by Mr. Briceno at La Polonia, 

 Venezuela. 



Remarks. — The male of this species can easily be recog- 

 nized from that of the other described species of the genus 

 Mastigoproctus by the sliape of the immovable finger of tlie 

 hand, &.C. 



XXIV. — Descriptions of new Species of Cerithium, Clanculus, 

 and ISoletellina. By G. B. Sowekby, F.L.S. 



Cerithium vignali, sp. n. (Fig. 1.) 



Testa elongato-turrita, alba, plus minusve pallida fulvo tincta vel 

 strigata ; anfractus 13, planato convexi, costis numerosis tri- 

 nodulosis longitudiaaliter muniti, spiraliter tri-lirati efc multi- 

 striati; anfractus ultimus subquadratus, 3 longitudinis testae 

 a^quans, baud rostratus, spiraliter sex-liratus, uni-varicosus ; 

 apertura oblique ovata ; labruin crenulatum, extus varicosum ; 

 columella arcuata, laevis, postice uai-lirata ; canalis perbrevis. 



Long. 30, lat. 11 mm. 



Hah. New Caledonia. 



A long, narrow, 'white shell, more or less faintly tinged and 

 streaked between the numerous longitudinal ribs with light 

 brown. The ribs are pretty equally trinodulose, terminating 

 abruptly at the top of the wiiorls. The whorls (excepting 

 the last) are three-ridged and all are spirally striated, the 

 last having six ridges, of which the three basal ones are 

 more sharply raised than the others. 



This species has been compared with C. armatum (Phil.), 

 from which it is readily distinguislied ; the row of nodules 

 against the suture being rounded, scarcely larger than the 



