BARNACLES FROM THE NORTH PACIFIC — HENRY 



231 



LEPAS FASCICULARIS AURIVILLII Nilsson-Caiitell 

 FiGUEB 4 



Lepas fascicularis aurivilUi Nilsson-Cantell, 1921, p. 238. 



Diagnosis. — Externally like the typical form. Cirri shorter, with 

 broader segments, covered with fine hairs. Carina same width as in 

 the typical form (Nilsson-Cantell). 



Supplementary description. — Specimens of this subspecies were col- 

 lected in three localities. Unlike the specimens described by Nilsson- 

 Cantell, certain external characters varied somewhat from those of 

 L. fascicularis. 



As Nilsson-Cantell (1921) pointed out, there are five filamentary 

 appendages, and the mouth parts do not differ from those of the 

 typical form, as figured by Hoek (1883). All the 

 maxillae examined had three steps below the upper 

 large spines. Von Willeraoes-Sulmi (1876) examined 

 a large series of L. fasciculans and found three steps 

 more frequently than four steps as found by Darwin. 

 He also found mandibles with four teeth instead of 

 five. Many small spines occur on both edges of the 

 teeth and to some extent on the surface. 



The specimens examined differ from the typical form 

 and are similar to Darwin's variety villosa in that the 

 valves are not approximate. The interspace between 

 the scutum and tergum is almost half the width of the 

 scutum. The carina also differs from that of the typi- 

 cal form and is similar to that of the variety donovani 

 Leach as described by Darwin. It is flat above the 

 umbo and has a narrow central external ridge, which 

 is somewhat less distinct on the disk (fig. 4) . 



The valves are covered with a spinose membrane, although the 

 spines are more minute than those seen by Darwin. Hoek (1883) 

 also found the smaller spines on L. fascicularis from the Pacific. 



Size. — The largest specimen had a capitulum 47 mm. in length and 

 37 nmi. in width; the peduncle was 10 mm. in length and 8 mm. in 

 width. The largest specimen described by Nilsson-Cantell (1921) 

 had a capitulum 8 mm. in length and 6 mm. in width. 



Localities. — Bangkok, on Limulus; Java Sea (Nilsson-Cantell). 

 New records : Queen Charlotte Sound, British Columbia, July 6, 1934, 

 floating, a number of specimens attached to gelatinous balls. Biorka 

 Island, Alaska, July 21, 1926, also attached to gelatinous balls. Swift- 

 sure Bank (lat. 48°31' N., long. 124°53' W.), August 5, 1934, attached 

 to a iJ-elatinous ball. 



FiGDRE 4. — Lepas 

 fascicularis au- 

 rimlHi from 

 Biorka Island, 

 Alaska : Cari- 

 na, extei-nal 

 view. Natural 

 size. 



