390 PROCEEDINGS OF THE ACADEMY OF [PaRT II 



Pyramidella (Longchseus) jamaicensis Dall. 



Pyramdella {Longchceus) jamaicensis Dall, Proc. U. S. Nat. Mus. xix, p. 315; 

 pi. 29, fig. 10. 

 Callolongchaeiis jamiicensis Dall, Trans. Wagn. Inst, iii, p. 1584. 



A single young example, length 2.3 mm., was found in the bottle 

 with P. cnnaliculata. 



Pyramidella (Triptychus) nivea (Morch) 



Obeli cus niveus Morch, Malak. Blatter, xxii, 1875, p. 159. 

 Ceiithium hiseriatum Gabb, Journ. A. N. S. Phila. (N. Ser.), \iii, p. 361, pi. 46, 

 fig. 50. 



A single young specimen agrees with Gabb 's type of C biseriatum, 



which came from Costa Rica; also with the young of the recent form. 



Oscilla indiscreta Guppy is a closely related Bowden species. 



Pyramidella canaliculata (Gabb) Plate XXXV. flg. 14. 



Obeliscus canaliculatus Gabb, Trans. Amer. Philos. Soc, xv, 1873, p. 225. 



The shell is straightly conic. The sutural channel is formed by 

 the excavation of the lower border of each whorl and a narrower 

 excavation of the upper border, which is minutely crenulated just 

 below the suture, and when quite perfectly preserved, at the shoulder 

 angle also, at least on some of the whorls. A little thread just above 

 the suture divides the sutural channel. There is a not very large 

 gutter immediately below the peripher5^ The whorls are quite flat 

 and plain between the channels. There are three columellar plaits, 

 the upper one wide and subhorizontal. Within the outer lip are 

 four plicae, the lower one small, the upper very small. Umbilicus 

 narrow, circular, bounded by a strong, convex fasciole. 



The largest entire specimen (type) is 9.5 mm. long, 3.5 wide, Avith 

 12 whorls, the tip of the spire lost. Another shell was larger, diam. 

 4.6 mm., the spire and last whorl broken, three strong teeth within 

 the outer lip. 



Type no. 4080 A. N. S. P. 



Gabb's description and his vial of specimens were composite. 

 The latter contained in addition to the form we select as typical 

 P. canaliculata, specimens of the following species : one Pyramidella 

 jamaicensis, and several Odostomia pyrgulopsis, which were doubt- 

 less put in as young P. canaliculata. 



Gabb's measurements were evidently estimated from what the 

 largest examples would measure if the lip and spire were perfect. 

 We select an immature shell as type, since it accords best with 

 most of his definition. 



There is a Pyramidella canaliculata of Sowerby (Proc. Zool. Soc, 



