74 THE .NAUTILUS. 



eyes in front of them and more separated. Mouth a vertical slit iu 

 a papillose disk. Swimming lobes arising at or behind the middle 

 of the animal's length, contiguous. Posterior subcircular area de- 

 fined by a groove with smooth, raised anterior edge, and enclosing a 

 cord. Mantle having a large shell-foramen and a long posterior 

 siphonal fold. Genital orifice under the back part of the gill. 



Color (in alcohol) dark olive, or dull brown with more or less 

 black maculation. In life it is said to be " a dark brown and the 

 surface covered with warty papillse." 



Shell solid, with a brown cuticle. Apex with a roughened 

 reflexed callus, continuing along the dorsal margins as a reflexed 

 border over the cuticle. 



In external appearance, this species seems nearest to D. ecuitdata 

 and tongaiia, but the posterior area is defined by a far less conspic- 

 uous frill, which does not extend to the edges of the dorsal slit. 

 Dolabella guayaquilensis, a species known by the shell only, is stated 

 to have the margins '' scarcely reflected, callus small, narrow, not 

 continued upon the margins," while in the present species the mar- 

 gins are bounded by unusually broad reflexed callous bands. Traces 

 of sparsely scattered wart-like papillse are visible on some specimens, 

 mainly posteriorly, but these are not very distinct in the alcoholic 

 examples. Two of the original lot collected by Fisher are before 

 me, the smaller one being drawn in my figure, and another specimen 

 of a dark olive color collected by Dr. W. H. Jones on the " \\Vst 

 coast of Mexico," has also been examined. 



DESCRIPTIONS OF NEW PISIDIA 



BY DR. V. 8TERKI. 



In looking over more than 20,000 specimens of Plsidiitm, during 

 the last twelve months, the writer came across numerous new forms, 

 and many of them will prove to be new species. But, as some of those 

 already published are not fixed beyond a doubt, owing to insufficient 

 descriptions and figures, and lack of reliable originals, and as new 

 forms are constantly coming in, it will be advisable not to hurry 

 with publications. Yet a few of these new species were seen from so 

 many different places, and come to hand again and again that 

 it is too unsatisfactory to return them without or only with MS. 



