66 GASTROPODA. [Aspidobranchia. 







Remarks. The number of ribs and the height of the shell are 

 very variable. Most specimens have a thick layer of Nulliporites. 

 Our A. rubiginosa, cingulata, and corticata have been compared with 

 the type of A. lacunosa, Reeve (habitat unknown), in the British 

 Museum, and all of our three species are distinct. The late von 

 Martens suggested that A. rubiginosa, Hutt., and A. lacunosa, Reeve, 

 might be identical. 



Fossil in the Pliocene. 



2. Group of Acmsea fragilis. 

 Teeth having the same formula, but the cutting-points hamate. 



5. Acmsea Campbell!, Filhol, 1880. Plate 5, fig. 10. 



Patella Campbelli, Filhol, " Comptes Reruhis," xei, 1880, 1095 ; Filhol, 

 Miss. I.C., 1885, 530; Ac.mcea Campbdli, Filhol: Suter, P. Mai. S.. vii, 

 321, pi. 27, f. 19, 20. 



Shell small, roundish-oval, conical, subpellucid, finely ribbed, pink. 

 The radiate riblets are very numerous and close together, about 40 

 reach from apex to margin and about 20 are interstitial ; they are 

 broadly convex, and crossed by numerous very fine concentric growth- 

 lines. The colour is uniformly pink. Apex small, rounded, situated 

 at about the anterior third of the length ; anterior slope straight, 

 posterior slope very little convex. Inside pinkish-white, with white 

 radiating rays, corresponding to the riblets ; central area pink ; margin 

 crenulate, with a narrow pink border. 



Length, 5 mm. ; breadth, 5 mm. ; height, 3 mm. (type). Length. 

 5 - 75 mm. ; breadth, 4-75 mm. ; height, 3 mm. (from Auckland Islands). 



Dentition. Suter, P. Mai. S., vii, pi. 27, f. 21. 



Type in the Mus. Hist. Nat., Paris. 



Hob. The type was collected by the late Professor Filhol at the 

 entrance to the north-east bay of Campbell Island ; Auckland Islands 

 (Captain Bollons). 



Remark. - - This shell, insufficiently described and not figured by 

 Filhol, seems to be rare, or easily overlooked. 



6. Acmaea cantharus, Reeve, 1855. Plate 7, fig. 1. 



Patella cantharus, Reeve, Conch. Icon., 1855, fig. 131. Acmaea cantharus, 

 Reeve, Man. Conch. (1), xiii, 55, pi. 37, f. 1, 2 ; Vevco, T.R.S. S.Aust., 

 xxx, 215, not of Reeve ; Suter, P. Mai. S., vii, 320 ; Iredale. T.N.Z.I., xl, 

 376. 



Shell small, ovate, thin, apex anterior, blotched with white. The. 

 sculpture consists of fine microscopic radiate striae ; one of my speci- 

 mens shows a few well-marked distant riblets on the posterior side, 

 but this is an exception ; concentric growth-lines are fairly conspicuous. 

 Colour black or brown, blotched or tessellated with white. Apex very 

 anterior, sharp, and hooked ; anterior slope concave. Inside light, 



