322 REPORT ON ALBATROSS MOLLUSCA DALL. 



more slender, close-set, and longer in proportion to tbe base; the base 

 itself is of a yellow-brown tinge; the laterals and the cusps of the me- 

 dian teeth are of the usual pale-amber color. 



I do not remember to have seen attention called to the very general 

 dark color of the "false" or "supplementary gill," or osphradiuin, as 

 compared with the other soft parts. It is always darker than the true 

 gill ; the latter is usually darker than the general surface of the mantle, 

 though not so dark as the substance of the liver. 



Chrysodomus griseus sp. nov. 



Plato v, Fig. 6. 



Shell thin, solid, rather acutely pointed when perfect, but almost in- 

 variably eroded at the tip, eight whorled, covered with an olive gray 

 epidermis, the substratum, pillar, throat, and reflected lip milk-white; 

 nucleus eroded, small ; suture distinct, not appressed or channeled; 

 whorls full and rounded; transverse sculpture of twenty to twenty-five, 

 narrow somewhat irregular arcuated wave-like ribs, which on the 

 earlier whorls often reach from suture to suture but are strongest 

 on the periphery ; some specimens have them faint, others the ma- 

 jority have them strong, but in all they become more or less obso- 

 lete on the last whorl : spiral sculpture of rather coarse, rounded, not 

 much elevated cinguli, with narrow interspaces, slightly reticulated by 

 the incremental lines; variable in strength but usually covering the 

 whole surface; in five young specimens the surface over the sculpture 

 is somewhat polished, in adults it has a more rude appearance; aper- 

 ture oval, wide; the outer lip flexuous as in Buccinum, more or less (in 

 some specimens very much) reflected; margin simple, smooth; body 

 polished, the surface slightly excavated and glazed; pillar thin, simple, 

 twisted; the axis widely pervious in the young, minutely or not at all in 

 the adult ; canal short, wide, slightly recurved ; there is no siphonal 

 fasciole; operculum large, thin, ovoid, slightly curved, with au apical 

 nucleus. Maximum longitude of shell, 32; maximum latitude, 18""". 



Hah. — U. S. Fish Commission Station 2839, near the islands off Santa 

 Barbara, California, in 411 fathoms, grey sand; temperature not re- 

 corded. 



Animal whitish, with a little gray about the head and tentacles. 

 General form and details as in C. amiantus, except that the tentacles 

 are longer and more cylindrical and the verge is proportionately larger, 

 more cylindrical, with the termination swollen, slightly hood-shaped, 

 with a granular depressed oval area set obliquely at one side and no 

 visible terminal papilla. I am uncertain how much of the difference 

 noted in this organ between different species is due to its different de- 

 grees of extension when placed in alcohol and differences in contraction 

 taking place under the influence of alcohol. 



The dentition agrees with that of G. amiantus, but is ol course on a 

 much smaller scale. The sexual differences in C griseus are less than 



