264 AMERICAN JOURNAL 



and excavates a shallow cavity therein. According to D'Orbigny, 

 it is not uncommon. 



I have not been able to examine the soft parts of this species 

 and rely on Gould, Couthouy«and D'Orbigny. 



ScUKRiA (?) ZEBRINA, Lesson sp. 



Patella zehrina, Less., Zool. Coq. 1830, p. 417, No. 180. 

 Patella concepcionensis, Less., loc. cit. p. 418, No. 182. 

 Lottia zehrina, Gld., Moll. Expl. Exp. p. 352, pi. 30, fig. 460, 



460a. 

 Lottia variabilis. Gray, Moll. Beechey's Voy. p. 147, pi. 39, 



fig. 3—5, 1839. 

 Patella zebrina, D'Orb., Voy. Amer. Merid. v, p. 480, No. 



445, pi. Ixv, f. 1—3. 

 Teetura zebrina, Gray, Guide p. 171. 



D'Orbigny describes and figures this species as having a com- 

 plete cordon of strongly marked branchial lamellae ; Couthouy 

 speaks of "an encircling series of slight protuberances, which 

 appear to communicate with the cirri, and at first look like bran- 

 chial lamellae; at times very apparent, at others hardly visible," 

 while calling attention to the long and large gill. Gray speaks 

 of them as " fleshy beards " inside of the mantle, rather distant 

 and continuous over the head. On the whole, the evidence is 

 sufficiently full to justify us in placing the species in this genus, 

 at least provisionally. 



SCURRIA MESOLEUCA, Mke. sp. Plate 15, fig. 19. 



Aema>.a mesoleuca, Menke, Zeit. far Mai. p. 38, No. 135, 

 1851. Cpr., Maz. Cat. p. 203, No. 263. 



Soft parts mostly of a greenish tinge ; foot oval, thin, smooth ; 

 sides of foot quite smooth, edge thin, somewhat produced ; 

 mantle edge thickened, narrow, marked with dark brownish 

 spots or streaks corresponding with the rays of color on the 

 shell, irregularly bearded with a few papillose projections. 

 Branchial lamella forming a complete cordon just inside of the 

 mantle edge. Laminae close, crowded, equal all around, in 

 structure exactly agreeing with those of Patella and Lottia, a 

 little more puckered at the edges, perhaps from the eflFects of the 

 alcohol. Head small ; muzzle short, transversely oval, with an 

 equal, narrow, somewhat puckered frill all around. Disk radi- 

 ately striate, mouth circular, entire. Tentacles very short, 

 stout, bluntly pointed ; bases slightly swelled, not tuberculate ; 

 eyes small, on the superior part of the bases of the tentacles. 

 Gill like that of Lottia, but smaller, shorter, and relatively 



