. Bulletin - United States National Museum. Science. 72 BULLETIN 93, UNITED STATES NATIONAL MUSEUM. Hoek has described two new varieties: var. costatus and var. i^li- catus,^ both taken from the bottom of the Sihoga and therefore from some part of the Malay Ai'chipelago. Var. costatus was based upon one specimen 14 mm. in diameter; var. flicatus upon two, the larger of 10 mm. diameter. The open furrow of the tergum probably means that both were young barnacles. Quite possibly both may be the young of var. zebra Darwin. In any case, the very great difficulty of reaching a satisfactory understan
. Bulletin - United States National Museum. Science. 72 BULLETIN 93, UNITED STATES NATIONAL MUSEUM. Hoek has described two new varieties: var. costatus and var. i^li- catus,^ both taken from the bottom of the Sihoga and therefore from some part of the Malay Ai'chipelago. Var. costatus was based upon one specimen 14 mm. in diameter; var. flicatus upon two, the larger of 10 mm. diameter. The open furrow of the tergum probably means that both were young barnacles. Quite possibly both may be the young of var. zebra Darwin. In any case, the very great difficulty of reaching a satisfactory understanding of the forms of B. tintinnahulum can not be lightenad by the description of scanty, immature, and imperfectly locahzed material. BALANUS ALGICOLA, new species. Plate 12, figs. 3 to 3y. Tjii^e.—Cat. No. 15063, , from Cape To^vn, growing on algjB, collected by Wm. Ha,rvey Brown, United IStates eclipse expe- dition, 1889. Distribution.—South Fig. 12.—Balanus algicola a, b, terga of two and d, c,f, scuta of three individuals, c, pakt of TIIE EDGE OF A RADIUS, SHOWING DENTICULATE SEPTA AND OPEN ENDS OF THE RADIAL PORES. Very small, conic or cyiindric, usually growing in crowded clus- ters; wliite, or sometimes with faint violet stains, chiefly on the radii; smooth or somewhat ribbed. Diameter 7 mm.; height 9 mm. (typical, cyiindric form). Diameter 11 mm.; height 6 mm. (sohtary, conic form). Scutum very broad, having widely spaced growth-ridges, alternate ones forming teeth along the occludont margin; no radial striation. A broad, shallow depression runs down the middle of the valve. The tergal border is rather narrowly deflected. Tlio basitergal angle is cut off in varying degree, as showna in figure 12 d, e,f. The articular ridge is moderately high, reflcxed, with its lower end trun- 1 Both of these names are preoccupied in Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability
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