OF CONCHOLOGY. 137 



rather prominent in young shells. Carina intersected by the 

 grooves an'd slightly dentate. Lon. *24, lat. 42 in. 



Habitat, Monterey, California ; adhering to the tentaculse of 

 Actinias ; three specimens. 



This pretty and very distinct species is unlike any other from 

 the coast, and is readily recognized by the characteristic grooves. 



NUDIBRANCHIATA. 



ALDERIA -? ? ALBOPAPILLOSA, n. S. 



Body ovate, mantle larger than the foot, extending in front of 

 and hiding the muzzle. Eyes black, sessile on the anterior sur- 

 face of the body, near the mantle margin. Tentacles none. 

 Muzzle under, and hidden by the mantle edge, slightly produced 

 into two points at the corners, stout, wide, short. Foot thin, 

 oval. Anus terminal under the edge of the mantle. Orifices 

 at the right side near the muzzle. Mantle margin entire. Foot 

 regularly oval, thin, smaller than the mantle. Back regularly 

 rounded, smooth, and covered with a multitude of cylindrical, 

 short, stout, branchial appendages, radiating rather irregularly 

 from the top of the back to the edges of the mantle, and close 

 set all over the surface of the latter ; of an opaque white in life, 

 the remainder of the animal except the eyes being translucent 

 yellowish. 



Length -3, breadth -2 in. 



Habitat, Sitka, Alaska Territory, on fuci ; three specimens, 

 July, 1865. W. H. Dall. 



I am almost certain that this cannot belong in the genus Alde- 

 ria, but it comes nearest to that, and, for the present, I prefer 

 to refer it with doubt to that place. 



Doris Monterei/ensis and Eolis ojyalescens, Cpr., were found 

 with this species. 



PTEROPODA. 



Family CYMBULIIDiE. 

 Genus COROLLA, Dall. 



Like Tiedmannia, but with the body pendant below, unattached 

 to the pinnae, ovoid, constricted above. (Esophagus produced, 

 oral aperture trumpet-shaped, produced into two points. Pinnae 

 forming a single disk with reticulated muscular bands, separated 

 by a deep sinus from the oral portion. Pelagic. Shell entirely 

 absent. 



