10 THE VOYAGE OF II. M.S. CHALLENGER. 



famished with a line of slight quadrilateral depressions of a dirty brownish colour 

 running diagonally across the capitulum. The line, however, is not a straight one, as in 

 the ease of Lepas anatifera, but an inflected one, the hollow side being directed towards 

 i he aperture of the capitulum. 



I give a figure of the filamentary appendages of one of the largest specimens of this 

 species in PL I. fig. 4. In the smaller specimens — as Darwin has already observed — the 

 upper pair is represented by small knobs; in the larger specimens I found the most 

 anterior of the upper pair and the lowest posterior pair the largest. 



This species was collected: — Atlantic Ocean— May 6, 187G, on Gulfweed. A very 

 small specimen, with the angle formed by the two occludent margins of the tergum 

 larger still than 90°. South of Bermuda, surface. One small specimen attached to Gulf- 

 weed. Pacific Ocean — South-east of Kaine Island, August 29, 1872. Numerous young 

 andfull-grown specimens. Moluccan Sea, Station 192, September 26, 1874 ; lat. 5 3 42' S., 

 long. 132° 25' E. The depth from which the dredge was hauled at this Station was 129 

 fathoms, but though the branch with the specimens of Lepas formed part of its contents, 

 it does not prove that they were actually taken at the bottom. Near Station 217, 

 February 22, 1875, north coast of New Guinea. Numerous specimens floating at the 

 surface. North of the Low Archipelago, between Stations 275 and 276, September 15, 

 1875. Two small specimens, attached to one another and to a small piece of floating wood. 

 Near Station 276, September 1G, 1875, Low Archipelago. Small specimens attached to 

 a floating Janthina. 



Lepas pectinata, Spengler. 



Lepas pectinata, Spengler, Skrifter Xaturliist. Selskabet, II., 1793, p. 103, Tab. x. fig. 2. 

 „ „ Darwin, Monograph Lepadida>, 1851, p. 85. 



The furrowed surface of the specimens collected by the Challenger is very conspicuous ; 

 in almost every specimen all the ridges, and more especially that running from the umbo 

 to the apex of each scutum, are covered with prominent calcareous spines. 



Numerous specimens of this species were taken swimming at the surface, north of Cape 

 de Verde Islands, on April 28 and 29, 1876. Some of them were taken at night, others by 

 day. They were attached to shells of Spirula, and are of a very small size; some of the 

 Spirula shells only bear one specimen, which is placed terminally, others are furnished 

 with as many as three or even more specimens, in which case some are affixed terminally, 

 others laterally. 



A small piece of a Spirula shell was taken at the surface between Sydney 

 and Wellington, the terminal portion of which was occupied by a great number of 

 Cirripeddarvse in the Cypris-stage. Among them was a small specimen of Lepas 

 pectinata ; this, as far as my knowledge goes, is the first instance of the species having 



