38 THE VoYACK OF II.. M.S. CHALLENGER. 



Lepas anatifei'i. Linn. (I'l. I. figs. 1, 2). 



Zepas aim/ifi r>(, Linna-us, Syetema NatursB, 1767. 



„ „ Darwin, Monograph Lepadidse, 1851, p. 73. 



This species shows considerable variations in size and shape. The largest specimen 

 brought home by the Challenger has a capitulum of 45 mm. in length, whereas the 

 Ingest observed by Darwin measured 51 mm. (two inches). Among the smaller specimens, 

 those with a barbed carina (Darwin's var. b. " dentata") are by no means rare; of these 

 the capitulum measures at the utmost 1 7 mm. None of the specimens are furnished with 

 the diagonal line on scutum and tergumof dark greenish-brown, square, slightly depressed 

 marks, as figured by Darwin (loc. tit., pi. i. fig. 1). Curiously enough, I found the same 

 lines very distinctly developed on the scuta and terga of specimens of Lepas anserifera, 

 Linn., from the Pacific Ocean. 



This extremely common species was only met with by the Challenger in the Atlantic 

 Ocean. It inhabits the surface, attached to floating timber, vessels, &c. Very large 

 specimens were collected towards the end of 1872, almost before regular observations were 

 commenced. During the cruise itself it was observed at the following localities : — 



Near Station 30, April 2, 1873, south of Bermuda. Numerous small and even 

 extremely small specimens attached to a log and to each other. No ova. Carina smooth 

 or barbed as in var. b. "dentata." Larvae in the Cypris-stage are affixed to the 

 larger specimens, and to the surface of the log. 



Near Station 74, July 1, 1873, oft' Fayal, Azores. Small quantity attached to a 

 box. Not quite full-grown. Without ova. Carina smooth. Numerous larvae in the 

 Cypris-stage among the larger specimens. 



Station 75, July 2, 1873, off Fayal, Azores. Two small specimens with a barbed 

 carina ; depth 50 to 90 fathoms. Although the specimens came up with the dredge, 

 there can be no doubt but that they were taken at the surface. 



Near Station 137, October 24, 1873 ; lat, 35° 59' S., long. 1° 26' E. Attached to a 

 floating spar. Numerous specimens of different sizes ; the larger ones with ova. 



Cape of Good Hope, November 1873. Numerous specimens of very different sizes 

 (capitulum 5-45 mm.). The larger specimens with ova; taken from a log of wood. 



Observations. — A small bottle, labelled Station 244, 2900 fathoms, eontains a right- 

 hand scutum with the umbonal tooth. The shell has suffered considerably from the 

 influence of the sea water, yet belongs doubtlessly to the present species. 



Lepas hilUi, Leach, sp. (PI. I. fig. 3). 



PentcHasmis hillii, Leach, Tuckey's Congo Exped., 1818, p. 413. 

 Lepas hillii, Darwin, Monograph Lepadidae, 1851, p. 77. 



Two young specimens of this species were taken from the screw of the Challenger 

 at St. Vincent, Cape de Verde Islands, in April 1876. when on her return homewards. 



