MUSEUM OF COMPARATIVE ZOOLOGY. 333 



median spiral double rib, and is often notched by rubbing against the colu- 

 mellar plaits. The animal is pale, the tentacles fiat and triangular with the 

 black eyes rather close together, between rather than on the bases of the ten- 

 tacles. Below, the mentum extends in two triangular flaps, rather smaller than 

 the tentacles. The front of the foot is also triangularly auriculate at the 

 corners. The animal is sluggish. Stimpson could find no radula. The pale 

 variety is probably what Morch has doubtfully referred to " Syrnola" pulchella, 

 which is not a Syrnola. 



Pyramidella Candida Morch. 



Obeliscus (Longchceus) Candidas (Meusclien) Morel), Malak. Blatt., 1875, p. 158. 



< Pyramidella conica Tryon, non C. B. Adams. 



? Pyramidella Gundlachi Dunker MS., Arango, Mai. Cuban, p. 161, 1880 (name only). 



Habitat. Barbados, 100 fms., northward to the Carolina coast, in 15-200 

 fins., U. S. Fish Commission. Samana Bay, St. Domingo, Dall. Turtle 

 Harbor, Florida, in 6 fms., Dr. Rush. 



I have never been able to obtain a copy of Meuschen's work. It is impossible 

 to say how much probability there is of an identification of the present shell 

 with the poor figures of the last century. The name must stand as of Morch. 

 The P. Gundlachi of Dunker does not seem to have been described, but is 

 probably this species. P. crenulata is larger, wider, with less sharply cut and less 

 distinctly crenulated suture, and is rarely light colored, the brown columella 

 and anterior plaits remaining dark even in pale specimens, which, like the 

 varieties of conica on the west coast of America, are usually pinkish and deli- 

 cately maculated with brown. P. Candida is pure white; it sometimes has an 

 opaque white spiral line on the middle of the whorl, and two large and one or 

 two small lirse in the throat, usually one less than a P. crenulata of the same 

 size. The specimens sent by Dr. Rush show how curiously growth takes 

 place in the different parts. Some have a perforate umbilicus, no lirse, and a 

 simple columella without a plait or tooth ; a little later in the stage of growth 

 the large and then the two small folds are developed on the pillar, and lastly 

 the lirse opposite. A person without the intermediate stages would hardly 

 dream that the toothless and the toothed shells belonged even to the same 

 genus, though of course the folds on the pillar exist behind it and in the 

 antecedent whorls. 



Section PHARCIDELLA Dall. 



In Fischer and Tryon's Manuals the section Amoura De Folin is referred to 

 as constituted for Pyramidella} with longitudinal spirals on the base and sides 

 and faint transverse ribbing. But Amoura is merely a misprint for Amaura 

 Mbller, and the type is a shell which should be referred to Syrnola as a section, 

 or to Careliopsis, if separated at all. There is really but one columellar fold, 



