68 BULLETIN 93, UNITED STATES NATIONAL MUSEUM. 



is like that of occator. This does not apply to peninsularis, which has 

 the tergum like B. t. tintinnabulum. According to Darwin, B. t. 

 dorbignyi was taken from a ship from Java. 



B. t. spinosus and B. t. occator are oriental forms, certainly distinct 

 from the present subspecies. B. t. crispatus Schroter, as figured by 

 Schroter, agrees better with our specimens, but it is from an oriental 

 locality, just where being uncertain, as all known examples are from 

 ship's bottoms. There are various discrepancies between our speci- 

 mens and Darwin's account and figures, which cause me to hesitate to 

 assume their identity. Moreover, it is not at all likely that an oriental 

 form was imported to such an out-of-the-way place as Cape St. Lucas, 

 where it seems to be abundant, growing on native shells, etc. It is 

 equally unlikely that the ship furnishing Schroter's specimens could 

 have picked them up in Lower California prior to 1786. 



Nonspinose individuals of B. t. peninsularis are a good deal like 

 the Antillean B. t. antillensis in color, size, and opercular valves, 

 but the eastern form seems never to become spinose in the lot of 

 several hundred I have seen. 



BALANUS TINTINNABULUM COCCOPOMA Darwin. 



Plate 16, figs. 1, la, 2, 2a. 



1854. Balanus tintinnabulum, var. coccopoma DARWIN, Monograph, etc., p. 196, 

 pi. 1, fig. d; pi. 2, figs. I/, II, lo. 



Type. British Museum, from Panama. 



Distribution. Panama to Mazatlan. 



Coiivexly conic, with small rounded orifice, or sometimes cylindric, 

 with the orifice large,, Walls smooth or weakly striate, the parietes 

 roseate (spinal red or hellebore red of Bidgway), radii vinaceous 

 purple or rarely white. Greatest diameter 30 mm.; height 26 mm.; 

 specimens with a long, cylindric basis up to 50 mm. long. 



Scutum vinaceous purple, fading toward the lower margin, the 

 deflected tergal segment broad, cream white; adductor ridge promi- 

 nent, slightly overhanging the deep pit of the depressor muscle; 

 a.rticular rib terminating in a broad free point; basiscutal angle 

 usually much cut off, but sometimes shaped as in typical tintinna- 

 bulum; external growth-ridges close, smooth. 



Tergum as in B. t. tintinnabulum [or "sometimes with a broader 

 spur placed nearer to the basiscutal corner of the valve"]. 



This small, deep rose-colored race is restricted to the Panamic 

 faunal Province, 1 and appears to be rather a common littoral barnacle. 

 It has a very distinct appearance, but no doubt Darwin was right in 



1 Darwin mentions specimens resembling this variety sent him as "from a ship direct from China;" 

 but such data are open to doubt. Possibly he had B. t. rosa. The types were on a pearl oyster from 

 Panama "as Mr. Cuming believes;" and I have seen a good many from that place. M. Gruvel has 

 reported it from "California," but if the locality of his specimens is correct, they will probably be found 

 to be B. t. calif ornicus. 



