THE NAUTILUS. 87 



Length (type) 13.5 mm. g.d. 9 mm. Id. 7.3 mm. g.d. aper- 

 ture 4.7 mm. Id. 4 mm. 



Length (paratype) 14.5 mm. g.d. 9.7 mm. id 7.5 mm. g.d. 

 aperture 5.5 mm. l.d. 4.3 mm. 



Collected by Dr. S. S. Berry, March 1, 1814, at Cariji, Cerro 

 de Tuabaquey, Prov. Camaguey, Cuba. 



Type M. C. Z. No. 42005; Paratype, collection of Dr. S. S. 

 Berry. 



The chocolate-colored band is the most striking character of 

 Opisthosiphon berryi. Compared with 0. pupoides Mor. it has 

 more convex whorls, more numerous and finer plicae, the outer 

 lip is smooth, much less broadly expanded below and over the 

 breathing tube is bent forward rather than being reflected back, 

 as in 0. pupoides. The columellar lip does not completely 

 cover the umbilicus, as in pupoides. and its two lobes are much 

 more widely separated. The operculum is very similar to 0. 

 pupoides, differing only in being slightly more oval. In the 

 larger specimen very faint traces of fine chestnut-colored widely 

 interrupted spiral bands may be seen on the upper half of each 

 whorl, very similar in arrangement and color to those seen in 

 0. pupoides. A young specimen shows the embryonic shell to 

 consist of about 1 smooth whorls, the brown band and longi- 

 tudinal plicae beginning at about the second whorl, the plicae 

 becoming gradually more numerous and the intervening spaces 

 less wide. 



I am indebted to Mr. Berry for the opportunity to examine 

 this species. It is closely related to Opisthosiphon pupoides 

 Morelet from the Isle of Pines. The similarity of the shell 

 fauna of Camaguey, Santa Clara, and the Isle of Pines, has been 

 noted by Mr. John B. Henderson (NAUT., Vol. 27, p. 137; 

 NAUT., Vol. 29, p. 18). Mr. Henderson also calls attention to 

 the confusion in the genera of the Cyclostomatidae. 



The species described above belong to Opisthosiphon, Dall 

 (Proc. Mai. Soc. Lond., 1905, p. 209). Shells which possess 

 the operculum of a Rhytidopoma and in addition are provided 

 with a tubular projection behind the outer lip belong here. 

 Undoubtedly when all of the characters of the species placed in 

 this group are known, it will be found to be a natural one, and 



