64 BULLETIN 93, UNITED STATES NATIONAL MUSEUM. 



the cliief if not the only form of the species found in the West Indies, 

 but collections are very meager, and it woidd occasion no surprise 

 if the large oriental races were found estabhshed around ports fre- 

 quented by deep-sea vessels. 



The specimens from Jamaica have waved, transverse, colored bands 

 crossing the stripes on the parietes, and one of them has a deep, 

 pocketlike base and cylindric walls, 47 mm. long, with a greatest 

 diameter of 20 mm. Those from Rio Janeiro are imperfect, and 

 referred to this race with some doubt. Mr. S. Raymond Roberts 

 collected specimens near Havana, Cuba. 



A large series from a whaler, Cape Cod, September 3, 1879, col- 

 lected by Prof. A. E. VeiTill, is interesting for its associates and 

 coloration (pi. 13, figs. 2 to 2e). In aU probability the vessel was 

 a Provincetown schooner whaling in the West Indies, and the bar- 

 nacles were gathered in course of the usual short (six months) voy- 

 age. The wooden bottom was first rather copiously covered with 

 Balahus trigonus up to about 8 mm. diameter. These were then 

 mostly covered by flat, thin oysters (Ostrea folium Linnreus), mainly 

 under 25 mm. in length, and by the Balanus tintinnahulum antil- 

 lensis, wliich seem to have settled down at the same time. Upon 

 these oysters and barnacles Tetraclita radiata sits, the specimens 

 reaching a diameter of about 8 mm. There are also a few extremely 

 young Balanus ehurneus, 1 to 2 mm. diameter, wliich were clearly the 

 last settlers, after the vessel retiu-ned to Massachusetts. 



The B. tintinnahulum antillensis of this lot measure 15 to 20 mm. 

 diameter, with a height up to 25 mm., and may, perhaps, fall short 

 of their full growth. The parietes are moderately ribbed, rose-pink 

 to Indian lake, nearly uniform or in longitudinal stripes. The very 

 wide radii are white or nearly so, very smooth and glossy. Sheath 

 very pale. The base is roughened by the projecting edges of the 

 concentric slips composing it (fig. 2a). Scuta and terga.as in 

 B. tintinnahulum tintinnahulum., the growth-ridges of the scuta 

 somewhat crimped by the fine longitudinal strise. The scuta are 

 rose tinted ; terga white. 



Balanus tintinnahulum, var. vesiculosus Darwin ^ was based upon 

 extremely small individuals, scutum about 4 mm. long, and is scarcely 

 comparable with the other forms. Indeed, it seems to have been 

 regarded as a young stage rather than a true variety by Darwin. 



1 Monograph, etc., p. 195, pi. 2, flg. Ih. No locality. 



