Hutton. — On some Branchiate Gastropoda. 127 



denticulated on the outer side only, those of the outer marginals strongly 

 ■ denticulated on both sides. 



The specimen figured was collected at Auckland, on Zostera. The 

 eared central tooth differs from all the other species of Diloma. 



Haliotis iris, Martyn. PI. XV., fig. h. 



Animal sooty-black ; foot deeply notched in front. Dentition, oo -5-1-5- oo. 

 Central tooth about as broad as long, rounded posteriorly, and eared, re- 

 flexed portion without cutting-points, a long process projecting backward 

 and upward on each side below the reflexed portion. First lateral broader 

 than long, subquadrate, without cutting-points. Second lateral oval, 

 longer than broad, without cutting-points. Third lateral long and narrow 

 with a clavate process extending from the exterior side, and the whole of 

 the interior side occupied by a large cutting-point. Fourth lateral like the 

 third but shorter and broader. Fifth lateral oblong, transverse, with a 

 blunt cutting-point on the inner side. Marginals slender, denticulate on 

 both edges. 



The specimen figured was collected at Lyttelton. 



Paemophorus unguis, Linne. PI. XV., fig. i. . 



Dentition. — Central tooth subquadrate, broader than long, the reflexed 

 portion without cutting-points. First to fourth laterals similar, oval, the 

 length three times the breadth, without any cutting-points. Fourth and 

 fifth laterals large with two strong cutting-points. 



The specimen figured was collected at Lyttelton. 



AomjEa conoidea, Quoy and Gaimard. PI. XV., fig. k. 



Animal. — Margin of the mantle not fringed. Dentition. — Length of the 

 teeth more than three times the breadth, the recurved portions moderate ; 

 basal plates subrectangular, much longer than broad. No accessory teeth. 



The specimen figured was collected at Sumner. 



AcMJEA COETICATA, Hutton. PL XV., fig. L. 



Animal. — Margin of the mantle not fringed. Dentition. — Teeth rather 

 broad, the recurved portions very broad and blunt ; basal plates imbricating, 

 the anterior margin straight, the posterior and exterior margins deeply 

 sinuated, the interior margin concave ; a pair of accessory hooked teeth on 

 each side. 



The specimen figured was collected at Dunedin. 



Acmjea pileopsis, Quoy and Gaimard. PI. XV., fig. m. 



Dentition. — Length of teeth more than half the breadth, the recurved 

 portions rather long and pointed ; basal plates rhomboidal, with a central 

 longitudinal groove. No accessory teeth. 



The specimen figured was collected at the Auckland Islands by Mr. E. 

 Jennings, and sent me by Prof. T. J. Parker. 



